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Docker image jobs take a long time to schedule #1966

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avanier opened this Issue Jan 17, 2018 · 27 comments

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@avanier
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avanier commented Jan 17, 2018

  • Concourse version: 3.8.0
  • Deployment type (BOSH/Docker/binary): Binary
  • Infrastructure/IaaS: GCE

Our setup is composed of a minimum of 4 nodes in an autoscaling group. Nodes are configured as 1-standard-4 (4vcpu, 15GiB ram) with attached NVMe of 375GiB. The os is Ubuntu 16.04 LTS.

The following settings are of interest :

  • CONCOURSE_WORK_DIR is redirected to NVMe storage
  • CONCOURSE_BAGGAGECLAIM_DRIVER is set to overlay
  • CONCOURSE_BAGGAGECLAIM_VOLUMES is redirected to NVMe storage
  • CONCOURSE_BAGGAGECLAIM_OVERLAYS_DIR is redirected to NVMe storage
  • CONCOURSE_GARDEN_DESTROY_CONTAINERS_ON_STARTUP=true
  • CONCOURSE_GARDEN_DEPOT is redirected to NVMe storage
  • CONCOURSE_GARDEN_PROPERTIES_PATH is redirected to NVMe storage
  • CONCOURSE_GARDEN_ASSETS_DIR is redirected to NVMe storage
  • The NVMe is formatted with the following settings mkfs.xfs -f -n ftype=1 /dev/nvme0n1p1 and is mounted with noatime which is aligned with the Google storage recommendations for GCE
  • The NVMe partition is labeled GPT and is block aligned

We tested the NVMe on those instances and get performance in the ballpark of 330 MiB/s and 18k random IOPS on those kind of instances. We're hoping this should be sufficient to pull large images.

With the settings above, we are seeing certain tasks relying the Docker Image Resource where we know the images contain a lot of small files taking an average of 15 minutes before scheduling. The behaviour seems the consistent with what was observed in #1404 where a build will "hang" for a while in the loading state before announcing it's running.

unit-assets-web__4_-_concourse

We tried reverting to btrfs only to enjoy stalled workers and garden variety mayhem. (...see what I did there? 😛 )

This issue seems to be following in the wake of #1230, for which we had a meeting with @vito @jama-pivotal, and @topherbullock . (Thanks again for that guys! It's much appreciated!) I'm not hoping for a quick fix to this, but I'm hoping to outline that this situation is a quantifiable problem for the organizations where we're running Concourse. I am also volunteering whatever resources you believe might help us alleviate the problem.

As one would say... Halp!

cc @Typositoire @fkoclas @baptiste-bonnaudet

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vito commented Jan 17, 2018

Sounds like the same as #1404

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baptiste-bonnaudet commented Jan 17, 2018

By lots of small files we are talking of ~10000 files on a 100mb layer (uncompressed).

@vito could it be caused by overlay driver itself or the way Concourse uses volumes? Can the underlying filesystem affect this? Also if overlay takes 15minutes to schedule the volumes and btrfs corrupts the workers is there another alternative?

Sorry to insist but this issue is driving us nuts ;)

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vito commented Jan 17, 2018

If there was an alternative, believe me, we'd be on it quickly. We're well aware of the impact of these issues but unfortunately, as described in #1404 (comment) - we don't have many options. It drives us nuts, too.

Your best bet right now is to use the very latest available btrfs - don't stick to older LTS kernels. You may then get performance and stability assuming they've fixed some of the issues since then.

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vito commented Jan 17, 2018

@baptiste-bonnaudet If you do switch back to btrfs and encounter stability issues, please report them - there may be valuable kernel stack traces to inspect that can help us target workarounds.

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avanier commented Jan 17, 2018

@fkoclas just let me know that our most recent round of misadventures with btrfs was under kernel 4.13.0-1006-gcp.

I'll see with him if we can do anything to trap us some gremlins.

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fkoclas commented Jan 18, 2018

After a while with btrfs as the baggageclaimdriver on top of xfs we get a bunch of kernel stack traces, mostly related to the IO completely locking up thus generating a bunch of kernel_task_hung. Sample stack trace at the end of this comment.

I noticed that since btrfs is on top of xfs, it generates a volumes.img taking nearly 100% of the partition, and then uses the loopback driver to mount it to volumes as btrfs.

I'm currently testing having the nvme formatted natively in btrfs to avoid having that extra overhead of loopback fs.

Stack trace with btrfs on top of xfs (thus using loopback driver):

[ 2348.261183] WARNING: CPU: 2 PID: 6661 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
[ 2348.261183] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables xfs ppdev input_leds parport_pc parport pvpanic serio_raw ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
[ 2348.261221] CPU: 2 PID: 6661 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
[ 2348.261221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 2348.261223] task: ffff95fa0fbd8000 task.stack: ffffb50b431a0000
[ 2348.261240] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
[ 2348.261241] RSP: 0018:ffffb50b431a3b80 EFLAGS: 00010206
[ 2348.261243] RAX: ffff95f971ec9a40 RBX: ffff95f957508800 RCX: 0000000000000000
[ 2348.261244] RDX: 0000000000000000 RSI: ffff95f957508800 RDI: ffff95fbada33690
[ 2348.261244] RBP: ffffb50b431a3ba8 R08: ffffd50b3fd00d20 R09: ffff95fbada33690
[ 2348.261245] R10: 0000000000000000 R11: ffff95fbcf545840 R12: ffff95fbada33690
[ 2348.261246] R13: ffff95fbaecac8f8 R14: ffff95fbaeca0000 R15: ffff95f957508800
[ 2348.261248] FS:  00007f42fa7a1b88(0000) GS:ffff95fc3fd00000(0000) knlGS:0000000000000000
[ 2348.261249] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2348.261250] CR2: 000000c42a474fc0 CR3: 00000000ba3e8006 CR4: 00000000001606e0
[ 2348.261256] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2348.261257] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2348.261258] Call Trace:
[ 2348.261277]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
[ 2348.261292]  start_transaction+0x9b/0x440 [btrfs]
[ 2348.261306]  btrfs_start_transaction+0x1e/0x20 [btrfs]
[ 2348.261323]  btrfs_mksubvol+0x420/0x570 [btrfs]
[ 2348.261328]  ? wait_woken+0x80/0x80
[ 2348.261345]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
[ 2348.261362]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
[ 2348.261379]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
[ 2348.261383]  ? __check_object_size+0xfc/0x1a0
[ 2348.261387]  do_vfs_ioctl+0xa1/0x5f0
[ 2348.261388]  ? do_vfs_ioctl+0xa1/0x5f0
[ 2348.261390]  ? do_fcntl+0x449/0x580
[ 2348.261392]  ? do_sys_open+0x1b4/0x280
[ 2348.261394]  SyS_ioctl+0x79/0x90
[ 2348.261398]  entry_SYSCALL_64_fastpath+0x1e/0x81
[ 2348.261399] RIP: 0033:0x56407a73b324
[ 2348.261400] RSP: 002b:000000c42220e2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 2348.261402] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000056407a73b324
[ 2348.261403] RDX: 000000c420acd000 RSI: 0000000050009417 RDI: 0000000000000011
[ 2348.261404] RBP: 000000c42220e518 R08: 0000000000000000 R09: 0000000000000000
[ 2348.261405] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[ 2348.261406] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
[ 2348.261407] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
[ 2348.261438] ---[ end trace 7c8ed087b6bae51e ]---
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fkoclas commented Jan 19, 2018

The exact same issue occurs when having the drive natively formatted as btrfs. Tried Ubuntu 16.04.3, 17.10 and Debian Stretch, all with slightly different kernel versions (4.9 --> 4.13), all experiencing the same issues with btrfs.

In my latest test, the worker stalled with 1039 subvolumes existing.

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vito commented Jan 19, 2018

Having all of the kernel logs/traces would really help. I'm checking to see which code paths are involved - I've seen some traces contain quota handling before, which we may be able to remove if it's the root cause.

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fkoclas commented Jan 19, 2018

I have tried naive for the heck of it and in our use-cases the load avgs were off the charts and the disk was filling up at a rate of roughly 5% per minute, so even if we wanted to recycle the workers daily it wouldn't suffice. That and the fact that the autoscaling group would always be maxing out because of the insane cpu usage of the naive driver.

Anyway.. here is a (LONG!) copy-pasta of all the stack traces that happened after a clean btrfs worker provisionning. (click the arrow)

  • Output of dmesg -k -l warn

      [  767.822086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  767.822087] task: ffff9aa535b1dd00 task.stack: ffffbce783e74000
      [  767.822106] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  767.822107] RSP: 0018:ffffbce783e77b80 EFLAGS: 00010202
      [  767.822109] RAX: ffff9aa52dc23a40 RBX: ffff9aa67edc3800 RCX: 0000000000000000
      [  767.822110] RDX: 0000000000000000 RSI: ffff9aa67edc3800 RDI: ffff9aa860345b40
      [  767.822111] RBP: ffffbce783e77ba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345b40
      [  767.822112] R10: 0000000000000000 R11: ffff9aa59733f000 R12: ffff9aa860345b40
      [  767.822113] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa67edc3800
      [  767.822114] FS:  0000000000aa5a00(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  767.822116] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  767.822117] CR2: 0000000000ab8eb8 CR3: 00000000169de002 CR4: 00000000001606e0
      [  767.822121] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  767.822122] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  767.822123] Call Trace:
      [  767.822143]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  767.822160]  start_transaction+0x9b/0x440 [btrfs]
      [  767.822177]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  767.822196]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  767.822201]  ? wait_woken+0x80/0x80
      [  767.822219]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  767.822237]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  767.822254]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  767.822257]  ? lru_cache_add_active_or_unevictable+0x36/0xb0
      [  767.822260]  ? __handle_mm_fault+0xdaa/0x1070
      [  767.822265]  do_vfs_ioctl+0xa1/0x5f0
      [  767.822266]  ? do_vfs_ioctl+0xa1/0x5f0
      [  767.822269]  ? __do_page_fault+0x283/0x4f0
      [  767.822272]  SyS_ioctl+0x79/0x90
      [  767.822275]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  767.822277] RIP: 0033:0x4f4677
      [  767.822278] RSP: 002b:00007ffe57dd24a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
      [  767.822279] RAX: ffffffffffffffda RBX: 0000000000000063 RCX: 00000000004f4677
      [  767.822280] RDX: 00007ffe57dd24f0 RSI: 0000000050009417 RDI: 0000000000000003
      [  767.822281] RBP: 0000000000002710 R08: 0000000000000000 R09: 00000000000000ae
      [  767.822282] R10: 000000000000000f R11: 0000000000000202 R12: 0000000000001010
      [  767.822283] R13: 00000000007a3098 R14: 0000000000ab7ea0 R15: 00000000007a3040
      [  767.822285] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  767.822315] ---[ end trace a43c996c7ae1c25c ]---
      [  814.992358] ------------[ cut here ]------------
      [  814.992399] WARNING: CPU: 2 PID: 20307 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  814.992400] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  814.992443] CPU: 2 PID: 20307 Comm: btrfs Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  814.992444] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  814.992445] task: ffff9aa53b415d00 task.stack: ffffbce7859b0000
      [  814.992463] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  814.992464] RSP: 0018:ffffbce7859b3b80 EFLAGS: 00010206
      [  814.992466] RAX: ffff9aa5065868c0 RBX: ffff9aa7b08e7000 RCX: 0000000000000000
      [  814.992467] RDX: 0000000000000000 RSI: ffff9aa7b08e7000 RDI: ffff9aa86024e8e8
      [  814.992468] RBP: ffffbce7859b3ba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024e8e8
      [  814.992469] R10: 0000000000000000 R11: ffff9aa6b15e6300 R12: ffff9aa86024e8e8
      [  814.992470] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa7b08e7000
      [  814.992471] FS:  0000000000f5aa00(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  814.992472] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  814.992473] CR2: 0000000000f6deb8 CR3: 000000002a89c003 CR4: 00000000001606e0
      [  814.992478] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  814.992479] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  814.992480] Call Trace:
      [  814.992498]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  814.992515]  start_transaction+0x9b/0x440 [btrfs]
      [  814.992531]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  814.992549]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  814.992554]  ? wait_woken+0x80/0x80
      [  814.992572]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  814.992589]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  814.992606]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  814.992609]  ? lru_cache_add_active_or_unevictable+0x36/0xb0
      [  814.992612]  ? __handle_mm_fault+0xdaa/0x1070
      [  814.992618]  do_vfs_ioctl+0xa1/0x5f0
      [  814.992619]  ? do_vfs_ioctl+0xa1/0x5f0
      [  814.992623]  ? __do_page_fault+0x283/0x4f0
      [  814.992625]  SyS_ioctl+0x79/0x90
      [  814.992629]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  814.992630] RIP: 0033:0x4f4677
      [  814.992631] RSP: 002b:00007ffd0e953f48 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
      [  814.992633] RAX: ffffffffffffffda RBX: 0000000000000063 RCX: 00000000004f4677
      [  814.992634] RDX: 00007ffd0e953f90 RSI: 0000000050009417 RDI: 0000000000000003
      [  814.992636] RBP: 0000000000002710 R08: 0000000000000000 R09: 00000000000000ae
      [  814.992637] R10: 000000000000000f R11: 0000000000000202 R12: 0000000000001010
      [  814.992638] R13: 00000000007a3098 R14: 0000000000f6cea0 R15: 00000000007a3040
      [  814.992639] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  814.992672] ---[ end trace a43c996c7ae1c25d ]---
      [  856.722834] ------------[ cut here ]------------
      [  856.722861] WARNING: CPU: 3 PID: 24154 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  856.722871] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  856.722912] CPU: 3 PID: 24154 Comm: btrfs Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  856.722913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  856.722915] task: ffff9aa48d8b8000 task.stack: ffffbce7854b8000
      [  856.722933] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  856.722934] RSP: 0018:ffffbce7854bbb80 EFLAGS: 00010206
      [  856.722936] RAX: ffff9aa5d1e78230 RBX: ffff9aa825011800 RCX: 0000000000000000
      [  856.722937] RDX: 0000000000000000 RSI: ffff9aa825011800 RDI: ffff9aa860345bb8
      [  856.722938] RBP: ffffbce7854bbba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345bb8
      [  856.722939] R10: 0000000000000000 R11: ffff9aa59b335600 R12: ffff9aa860345bb8
      [  856.722940] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa825011800
      [  856.722942] FS:  0000000002585a00(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  856.722943] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  856.722944] CR2: 0000000002598eb8 CR3: 00000000b68b0002 CR4: 00000000001606e0
      [  856.722948] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  856.722949] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  856.722950] Call Trace:
      [  856.722970]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  856.722987]  start_transaction+0x9b/0x440 [btrfs]
      [  856.723003]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  856.723022]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  856.723026]  ? wait_woken+0x80/0x80
      [  856.723044]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  856.723061]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  856.723079]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  856.723082]  ? lru_cache_add_active_or_unevictable+0x36/0xb0
      [  856.723085]  ? __handle_mm_fault+0xdaa/0x1070
      [  856.723090]  do_vfs_ioctl+0xa1/0x5f0
      [  856.723092]  ? do_vfs_ioctl+0xa1/0x5f0
      [  856.723095]  ? __do_page_fault+0x283/0x4f0
      [  856.723097]  SyS_ioctl+0x79/0x90
      [  856.723101]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  856.723103] RIP: 0033:0x4f4677
      [  856.723103] RSP: 002b:00007ffdfcc69ed8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
      [  856.723105] RAX: ffffffffffffffda RBX: 0000000000000063 RCX: 00000000004f4677
      [  856.723106] RDX: 00007ffdfcc69f20 RSI: 0000000050009417 RDI: 0000000000000003
      [  856.723107] RBP: 0000000000002710 R08: 0000000000000000 R09: 00000000000000ae
      [  856.723108] R10: 000000000000000f R11: 0000000000000202 R12: 0000000000001010
      [  856.723109] R13: 00000000007a3098 R14: 0000000002597ea0 R15: 00000000007a3040
      [  856.723111] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  856.723144] ---[ end trace a43c996c7ae1c25e ]---
      [  869.078617] ------------[ cut here ]------------
      [  869.078646] WARNING: CPU: 3 PID: 13089 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  869.078647] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  869.078687] CPU: 3 PID: 13089 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  869.078689] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  869.078690] task: ffff9aa7f30f45c0 task.stack: ffffbce784c38000
      [  869.078708] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  869.078710] RSP: 0018:ffffbce784c3bb80 EFLAGS: 00010287
      [  869.078711] RAX: ffff9aa5342c2690 RBX: ffff9aa5a8030000 RCX: 0000000000000000
      [  869.078712] RDX: 0000000000000000 RSI: ffff9aa5a8030000 RDI: ffff9aa8603452d0
      [  869.078713] RBP: ffffbce784c3bba8 R08: ffffdce77fd80cc0 R09: ffff9aa8603452d0
      [  869.078714] R10: 0000000000000000 R11: ffff9aa696457000 R12: ffff9aa8603452d0
      [  869.078715] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5a8030000
      [  869.078717] FS:  00007f904554fae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  869.078718] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  869.078719] CR2: 0000000000000000 CR3: 000000023cf9e005 CR4: 00000000001606e0
      [  869.078724] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  869.078725] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  869.078726] Call Trace:
      [  869.078745]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  869.078762]  start_transaction+0x9b/0x440 [btrfs]
      [  869.078779]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  869.078798]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  869.078803]  ? wait_woken+0x80/0x80
      [  869.078822]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  869.078841]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  869.078858]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  869.078864]  ? __check_object_size+0xfc/0x1a0
      [  869.078876]  do_vfs_ioctl+0xa1/0x5f0
      [  869.078878]  ? do_vfs_ioctl+0xa1/0x5f0
      [  869.078880]  ? do_fcntl+0x449/0x580
      [  869.078882]  ? do_sys_open+0x1b4/0x280
      [  869.078885]  SyS_ioctl+0x79/0x90
      [  869.078888]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  869.078890] RIP: 0033:0x558c21424324
      [  869.078891] RSP: 002b:000000c422371f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  869.078893] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000558c21424324
      [  869.078895] RDX: 000000c4214db000 RSI: 0000000050009417 RDI: 0000000000000011
      [  869.078896] RBP: 000000c4223721f8 R08: 0000000000000000 R09: 0000000000000000
      [  869.078897] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  869.078898] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  869.078899] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  869.078931] ---[ end trace a43c996c7ae1c25f ]---
      [  870.511199] ------------[ cut here ]------------
      [  870.511231] WARNING: CPU: 3 PID: 13164 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  870.511232] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  870.511270] CPU: 3 PID: 13164 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  870.511271] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  870.511272] task: ffff9aa763cf9740 task.stack: ffffbce782364000
      [  870.511289] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  870.511290] RSP: 0018:ffffbce782367b80 EFLAGS: 00010216
      [  870.511291] RAX: ffff9aa49baef068 RBX: ffff9aa5a8030000 RCX: 0000000000000000
      [  870.511292] RDX: 0000000000000000 RSI: ffff9aa5a8030000 RDI: ffff9aa860345690
      [  870.511293] RBP: ffffbce782367ba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345690
      [  870.511294] R10: 0000000000000000 R11: ffff9aa7f9b4d000 R12: ffff9aa860345690
      [  870.511295] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5a8030000
      [  870.511296] FS:  00007f90454baae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  870.511297] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  870.511299] CR2: 000000c4229e1000 CR3: 000000023cf9e001 CR4: 00000000001606e0
      [  870.511303] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  870.511304] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  870.511305] Call Trace:
      [  870.511325]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  870.511341]  start_transaction+0x9b/0x440 [btrfs]
      [  870.511358]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  870.511376]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  870.511382]  ? wait_woken+0x80/0x80
      [  870.511400]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  870.511417]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  870.511434]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  870.511437]  ? __check_object_size+0xfc/0x1a0
      [  870.511454]  do_vfs_ioctl+0xa1/0x5f0
      [  870.511456]  ? do_vfs_ioctl+0xa1/0x5f0
      [  870.511458]  ? do_fcntl+0x449/0x580
      [  870.511459]  ? do_sys_open+0x1b4/0x280
      [  870.511462]  SyS_ioctl+0x79/0x90
      [  870.511465]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  870.511467] RIP: 0033:0x558c21424324
      [  870.511468] RSP: 002b:000000c4223722e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  870.511470] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000558c21424324
      [  870.511470] RDX: 000000c4201af000 RSI: 0000000050009417 RDI: 0000000000000011
      [  870.511471] RBP: 000000c422372518 R08: 0000000000000000 R09: 0000000000000000
      [  870.511472] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  870.511473] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  870.511474] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  870.511505] ---[ end trace a43c996c7ae1c260 ]---
      [  876.872500] ------------[ cut here ]------------
      [  876.872528] WARNING: CPU: 1 PID: 13693 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  876.872529] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  876.872573] CPU: 1 PID: 13693 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  876.872574] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  876.872575] task: ffff9aa72ad6c5c0 task.stack: ffffbce783bd8000
      [  876.872594] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  876.872595] RSP: 0018:ffffbce783bdbc98 EFLAGS: 00010283
      [  876.872596] RAX: ffff9aa520efe000 RBX: ffff9aa7a0e67000 RCX: 0000000000000000
      [  876.872597] RDX: 0000000000000000 RSI: ffff9aa7a0e67000 RDI: ffff9aa860380528
      [  876.872599] RBP: ffffbce783bdbcc0 R08: 0000423f00001270 R09: 0000000000000000
      [  876.872599] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860380528
      [  876.872600] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4e7886000
      [  876.872602] FS:  00007fa822859ae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  876.872603] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  876.872604] CR2: 000055c160416838 CR3: 00000001d4cb2002 CR4: 00000000001606e0
      [  876.872610] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  876.872610] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  876.872611] Call Trace:
      [  876.872632]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  876.872652]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  876.872672]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  876.872676]  ? __check_object_size+0xfc/0x1a0
      [  876.872679]  ? dput+0xc7/0x1f0
      [  876.872681]  do_vfs_ioctl+0xa1/0x5f0
      [  876.872683]  ? do_vfs_ioctl+0xa1/0x5f0
      [  876.872685]  ? ____fput+0xe/0x10
      [  876.872687]  ? task_work_run+0x83/0xa0
      [  876.872690]  SyS_ioctl+0x79/0x90
      [  876.872694]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  876.872695] RIP: 0033:0x55fbab166324
      [  876.872696] RSP: 002b:000000c42213d8b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  876.872698] RAX: ffffffffffffffda RBX: 00007fa822859ae8 RCX: 000055fbab166324
      [  876.872699] RDX: 000000c42213d918 RSI: 000000005000940f RDI: 0000000000000010
      [  876.872700] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  876.872701] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c422140000
      [  876.872702] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  876.872703] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  876.872737] ---[ end trace a43c996c7ae1c261 ]---
      [  877.022136] ------------[ cut here ]------------
      [  877.022167] WARNING: CPU: 1 PID: 13693 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  877.022168] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  877.022209] CPU: 1 PID: 13693 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  877.022210] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  877.022211] task: ffff9aa72ad6c5c0 task.stack: ffffbce783bd8000
      [  877.022229] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  877.022230] RSP: 0018:ffffbce783bdbb80 EFLAGS: 00010283
      [  877.022232] RAX: ffff9aa520ceb3b0 RBX: ffff9aa62b5dd000 RCX: 0000000000000000
      [  877.022233] RDX: 0000000000000000 RSI: ffff9aa62b5dd000 RDI: ffff9aa86024e690
      [  877.022233] RBP: ffffbce783bdbba8 R08: ffff9aa86a7ec8f8 R09: ffff9aa72ad6c5c0
      [  877.022234] R10: ffffbce783bdbb90 R11: 0000000100023380 R12: ffff9aa86024e690
      [  877.022235] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa62b5dd000
      [  877.022237] FS:  00007fa822859ae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  877.022238] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  877.022239] CR2: 000000c420073000 CR3: 00000001d4cb2006 CR4: 00000000001606e0
      [  877.022243] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  877.022244] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  877.022244] Call Trace:
      [  877.022278]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  877.022304]  start_transaction+0x9b/0x440 [btrfs]
      [  877.022329]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  877.022351]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  877.022379]  ? wait_woken+0x80/0x80
      [  877.022405]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  877.022422]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  877.022439]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  877.022443]  ? __check_object_size+0xfc/0x1a0
      [  877.022448]  do_vfs_ioctl+0xa1/0x5f0
      [  877.022450]  ? do_vfs_ioctl+0xa1/0x5f0
      [  877.022452]  ? do_fcntl+0x449/0x580
      [  877.022454]  ? do_sys_open+0x1b4/0x280
      [  877.022456]  SyS_ioctl+0x79/0x90
      [  877.022462]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  877.022464] RIP: 0033:0x55fbab166324
      [  877.022465] RSP: 002b:000000c42213df78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  877.022467] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055fbab166324
      [  877.022468] RDX: 000000c421257000 RSI: 0000000050009417 RDI: 0000000000000011
      [  877.022469] RBP: 000000c42213e1f8 R08: 0000000000000000 R09: 0000000000000000
      [  877.022469] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  877.022470] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  877.022472] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  877.022507] ---[ end trace a43c996c7ae1c262 ]---
      [  877.083328] ------------[ cut here ]------------
      [  877.083368] WARNING: CPU: 0 PID: 14774 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  877.083369] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  877.083415] CPU: 0 PID: 14774 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  877.083416] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  877.083417] task: ffff9aa5a3ab0000 task.stack: ffffbce783210000
      [  877.083435] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  877.083436] RSP: 0018:ffffbce783213b80 EFLAGS: 00010287
      [  877.083438] RAX: ffff9aa5a4cc13b0 RBX: ffff9aa59a88e800 RCX: 0000000000000000
      [  877.083439] RDX: 0000000000000000 RSI: ffff9aa59a88e800 RDI: ffff9aa8602065a0
      [  877.083440] RBP: ffffbce783213ba8 R08: 0000000000000004 R09: 0000000000000000
      [  877.083441] R10: 0000000000000329 R11: 0000000000000306 R12: ffff9aa8602065a0
      [  877.083442] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa59a88e800
      [  877.083444] FS:  00007f23d6daaae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  877.083445] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  877.083446] CR2: 000000c42034b000 CR3: 000000009992a004 CR4: 00000000001606f0
      [  877.083457] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  877.083458] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  877.083459] Call Trace:
      [  877.083479]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  877.083496]  start_transaction+0x9b/0x440 [btrfs]
      [  877.083513]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  877.083531]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  877.083536]  ? wait_woken+0x80/0x80
      [  877.083554]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  877.083573]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  877.083591]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  877.083595]  ? __check_object_size+0xfc/0x1a0
      [  877.083599]  do_vfs_ioctl+0xa1/0x5f0
      [  877.083601]  ? do_vfs_ioctl+0xa1/0x5f0
      [  877.083603]  ? do_fcntl+0x449/0x580
      [  877.083605]  ? do_sys_open+0x1b4/0x280
      [  877.083607]  SyS_ioctl+0x79/0x90
      [  877.083611]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  877.083613] RIP: 0033:0x559a0e982324
      [  877.083614] RSP: 002b:000000c421f77f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  877.083615] RAX: ffffffffffffffda RBX: 0000559a102ec960 RCX: 0000559a0e982324
      [  877.083616] RDX: 000000c420fa0000 RSI: 0000000050009417 RDI: 0000000000000011
      [  877.083617] RBP: 000000c421f77d60 R08: 0000000000000000 R09: 0000000000000000
      [  877.083618] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  877.083619] R13: 0000000000000018 R14: 0000000000000011 R15: 00000000b82c78de
      [  877.083621] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  877.083650] ---[ end trace a43c996c7ae1c263 ]---
      [  882.248688] ------------[ cut here ]------------
      [  882.248718] WARNING: CPU: 2 PID: 14771 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  882.248719] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  882.248759] CPU: 2 PID: 14771 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  882.248760] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  882.248762] task: ffff9aa5a3579740 task.stack: ffffbce783a58000
      [  882.248781] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  882.248782] RSP: 0018:ffffbce783a5bb80 EFLAGS: 00010202
      [  882.248784] RAX: ffff9aa482acd180 RBX: ffff9aa59a88e800 RCX: 0000000000000000
      [  882.248785] RDX: 0000000000000000 RSI: ffff9aa59a88e800 RDI: ffff9aa86024eac8
      [  882.248786] RBP: ffffbce783a5bba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024eac8
      [  882.248787] R10: 0000000000000000 R11: ffff9aa4bb78d540 R12: ffff9aa86024eac8
      [  882.248788] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa59a88e800
      [  882.248790] FS:  00007f23d6e11ae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  882.248791] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  882.248791] CR2: 00007f23d68ec1d8 CR3: 000000009992a002 CR4: 00000000001606e0
      [  882.248796] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  882.248797] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  882.248798] Call Trace:
      [  882.248819]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  882.248839]  start_transaction+0x9b/0x440 [btrfs]
      [  882.248868]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  882.248890]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  882.248896]  ? wait_woken+0x80/0x80
      [  882.248916]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  882.248936]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  882.248957]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  882.248962]  ? __check_object_size+0xfc/0x1a0
      [  882.248967]  do_vfs_ioctl+0xa1/0x5f0
      [  882.248969]  ? do_vfs_ioctl+0xa1/0x5f0
      [  882.248971]  ? do_fcntl+0x449/0x580
      [  882.248973]  ? do_sys_open+0x1b4/0x280
      [  882.248975]  SyS_ioctl+0x79/0x90
      [  882.248979]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  882.248981] RIP: 0033:0x559a0e982324
      [  882.248982] RSP: 002b:000000c421f782e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  882.248984] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000559a0e982324
      [  882.248985] RDX: 000000c42048c000 RSI: 0000000050009417 RDI: 0000000000000011
      [  882.248986] RBP: 000000c421f78518 R08: 0000000000000000 R09: 0000000000000000
      [  882.248987] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  882.248988] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  882.248989] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  882.249020] ---[ end trace a43c996c7ae1c264 ]---
      [  887.277653] ------------[ cut here ]------------
      [  887.277688] WARNING: CPU: 1 PID: 14438 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  887.277689] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  887.277730] CPU: 1 PID: 14438 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  887.277731] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  887.277732] task: ffff9aa64dae9740 task.stack: ffffbce783f48000
      [  887.277751] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  887.277752] RSP: 0018:ffffbce783f4bb80 EFLAGS: 00010206
      [  887.277754] RAX: ffff9aa48a6b07a8 RBX: ffff9aa4fa21c800 RCX: 0000000000000000
      [  887.277755] RDX: 0000000000000000 RSI: ffff9aa4fa21c800 RDI: ffff9aa860380000
      [  887.277756] RBP: ffffbce783f4bba8 R08: ffffdce77fc80cc0 R09: ffff9aa860380000
      [  887.277757] R10: 0000000000000000 R11: ffff9aa5acd579c0 R12: ffff9aa860380000
      [  887.277758] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4fa21c800
      [  887.277760] FS:  00007f26514dbae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  887.277761] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  887.277762] CR2: 0000000000000000 CR3: 0000000120318002 CR4: 00000000001606e0
      [  887.277766] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  887.277767] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  887.277768] Call Trace:
      [  887.277788]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  887.277806]  start_transaction+0x9b/0x440 [btrfs]
      [  887.277822]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  887.277841]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  887.277846]  ? wait_woken+0x80/0x80
      [  887.277864]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  887.277882]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  887.277899]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  887.277903]  ? __check_object_size+0xfc/0x1a0
      [  887.277907]  do_vfs_ioctl+0xa1/0x5f0
      [  887.277909]  ? do_vfs_ioctl+0xa1/0x5f0
      [  887.277911]  ? do_fcntl+0x449/0x580
      [  887.277913]  ? do_sys_open+0x1b4/0x280
      [  887.277915]  SyS_ioctl+0x79/0x90
      [  887.277919]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  887.277921] RIP: 0033:0x560dc5106324
      [  887.277922] RSP: 002b:000000c421feff78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  887.277924] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000560dc5106324
      [  887.277925] RDX: 000000c421fff000 RSI: 0000000050009417 RDI: 0000000000000011
      [  887.277926] RBP: 000000c421ff01f8 R08: 0000000000000000 R09: 0000000000000000
      [  887.277927] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  887.277928] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
      [  887.277929] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  887.277963] ---[ end trace a43c996c7ae1c265 ]---
      [  888.838856] ------------[ cut here ]------------
      [  888.838887] WARNING: CPU: 0 PID: 14438 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  888.838888] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  888.838929] CPU: 0 PID: 14438 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  888.838930] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  888.838931] task: ffff9aa64dae9740 task.stack: ffffbce783f48000
      [  888.838951] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  888.838952] RSP: 0018:ffffbce783f4bb80 EFLAGS: 00010283
      [  888.838953] RAX: ffff9aa7148515e0 RBX: ffff9aa4fa21c800 RCX: 0000000000000000
      [  888.838954] RDX: 0000000000000000 RSI: ffff9aa4fa21c800 RDI: ffff9aa860206348
      [  888.838955] RBP: ffffbce783f4bba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206348
      [  888.838956] R10: 0000000000000000 R11: ffff9aa73e321c00 R12: ffff9aa860206348
      [  888.838957] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4fa21c800
      [  888.838959] FS:  00007f26514dbae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  888.838959] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  888.838960] CR2: 0000558df3984ff0 CR3: 0000000120318001 CR4: 00000000001606f0
      [  888.838965] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  888.838966] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  888.838967] Call Trace:
      [  888.838988]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  888.839005]  start_transaction+0x9b/0x440 [btrfs]
      [  888.839021]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  888.839040]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  888.839045]  ? wait_woken+0x80/0x80
      [  888.839064]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  888.839081]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  888.839099]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  888.839103]  ? __check_object_size+0xfc/0x1a0
      [  888.839106]  do_vfs_ioctl+0xa1/0x5f0
      [  888.839108]  ? do_vfs_ioctl+0xa1/0x5f0
      [  888.839110]  ? do_fcntl+0x449/0x580
      [  888.839112]  ? do_sys_open+0x1b4/0x280
      [  888.839114]  SyS_ioctl+0x79/0x90
      [  888.839119]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  888.839120] RIP: 0033:0x560dc5106324
      [  888.839121] RSP: 002b:000000c421ff02e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  888.839123] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000560dc5106324
      [  888.839124] RDX: 000000c42045a000 RSI: 0000000050009417 RDI: 0000000000000011
      [  888.839125] RBP: 000000c421ff0518 R08: 0000000000000000 R09: 0000000000000000
      [  888.839126] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  888.839126] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
      [  888.839128] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  888.839159] ---[ end trace a43c996c7ae1c266 ]---
      [  891.527615] ------------[ cut here ]------------
      [  891.527645] WARNING: CPU: 0 PID: 24302 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  891.527646] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  891.527685] CPU: 0 PID: 24302 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  891.527686] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  891.527688] task: ffff9aa59fbc9740 task.stack: ffffbce784aa0000
      [  891.527706] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  891.527707] RSP: 0018:ffffbce784aa3b80 EFLAGS: 00010293
      [  891.527708] RAX: ffff9aa6e7ec96f8 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  891.527709] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa8602069d8
      [  891.527710] RBP: ffffbce784aa3ba8 R08: ffffdce77fc00cc0 R09: ffff9aa8602069d8
      [  891.527711] R10: 0000000000000000 R11: ffff9aa491d336c0 R12: ffff9aa8602069d8
      [  891.527712] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  891.527714] FS:  00007f95dc064ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  891.527715] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  891.527716] CR2: 00007f817df3a000 CR3: 000000017a65a004 CR4: 00000000001606f0
      [  891.527720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  891.527721] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  891.527721] Call Trace:
      [  891.527740]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  891.527757]  start_transaction+0x9b/0x440 [btrfs]
      [  891.527773]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  891.527791]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  891.527795]  ? wait_woken+0x80/0x80
      [  891.527813]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  891.527830]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  891.527848]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  891.527852]  ? __check_object_size+0xfc/0x1a0
      [  891.527855]  do_vfs_ioctl+0xa1/0x5f0
      [  891.527857]  ? do_vfs_ioctl+0xa1/0x5f0
      [  891.527859]  ? do_fcntl+0x449/0x580
      [  891.527861]  ? do_sys_open+0x1b4/0x280
      [  891.527863]  SyS_ioctl+0x79/0x90
      [  891.527866]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  891.527868] RIP: 0033:0x556de0ed4324
      [  891.527869] RSP: 002b:000000c421f0c2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  891.527871] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  891.527872] RDX: 000000c4204d7000 RSI: 0000000050009417 RDI: 0000000000000011
      [  891.527873] RBP: 000000c421f0c458 R08: 0000000000000000 R09: 0000000000000000
      [  891.527874] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  891.527875] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  891.527876] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  891.527904] ---[ end trace a43c996c7ae1c267 ]---
      [  896.738590] ------------[ cut here ]------------
      [  896.738619] WARNING: CPU: 3 PID: 24934 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  896.738620] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  896.738660] CPU: 3 PID: 24934 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  896.738662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  896.738663] task: ffff9aa48c6d45c0 task.stack: ffffbce782850000
      [  896.738682] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  896.738683] RSP: 0018:ffffbce782853b80 EFLAGS: 00010206
      [  896.738685] RAX: ffff9aa4bdf654c8 RBX: ffff9aa4fa21c800 RCX: 0000000000000000
      [  896.738686] RDX: 0000000000000000 RSI: ffff9aa4fa21c800 RDI: ffff9aa8603459d8
      [  896.738687] RBP: ffffbce782853ba8 R08: ffffdce77fd80cc0 R09: ffff9aa8603459d8
      [  896.738688] R10: 0000000000000000 R11: ffff9aa5a60f46c0 R12: ffff9aa8603459d8
      [  896.738688] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4fa21c800
      [  896.738690] FS:  00007f2650f20ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  896.738691] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  896.738692] CR2: 000000c42156d000 CR3: 0000000120318004 CR4: 00000000001606e0
      [  896.738696] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  896.738697] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  896.738697] Call Trace:
      [  896.738717]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  896.738734]  start_transaction+0x9b/0x440 [btrfs]
      [  896.738750]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  896.738769]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  896.738773]  ? wait_woken+0x80/0x80
      [  896.738792]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  896.738811]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  896.738829]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  896.738833]  ? __check_object_size+0xfc/0x1a0
      [  896.738837]  do_vfs_ioctl+0xa1/0x5f0
      [  896.738839]  ? do_vfs_ioctl+0xa1/0x5f0
      [  896.738841]  ? do_fcntl+0x449/0x580
      [  896.738843]  ? do_sys_open+0x1b4/0x280
      [  896.738845]  SyS_ioctl+0x79/0x90
      [  896.738848]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  896.738850] RIP: 0033:0x560dc5106324
      [  896.738851] RSP: 002b:000000c421feffc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  896.738853] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000560dc5106324
      [  896.738854] RDX: 000000c42191a000 RSI: 0000000050009417 RDI: 0000000000000011
      [  896.738855] RBP: 000000c421ff0248 R08: 0000000000000000 R09: 0000000000000000
      [  896.738856] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  896.738856] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
      [  896.738858] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  896.738899] ---[ end trace a43c996c7ae1c268 ]---
      [  899.891685] ------------[ cut here ]------------
      [  899.891721] WARNING: CPU: 0 PID: 13652 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  899.891721] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  899.891762] CPU: 0 PID: 13652 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  899.891763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  899.891764] task: ffff9aa763b10000 task.stack: ffffbce783788000
      [  899.891783] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  899.891785] RSP: 0018:ffffbce78378bb80 EFLAGS: 00010212
      [  899.891786] RAX: ffff9aa4a7ad9b58 RBX: ffff9aa5a8030000 RCX: 0000000000000000
      [  899.891787] RDX: 0000000000000000 RSI: ffff9aa5a8030000 RDI: ffff9aa860206a50
      [  899.891789] RBP: ffffbce78378bba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206a50
      [  899.891790] R10: 0000000000000000 R11: ffff9aa5c8438f00 R12: ffff9aa860206a50
      [  899.891791] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5a8030000
      [  899.891792] FS:  00007f9044fe2ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  899.891793] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  899.891793] CR2: 00007fe20f663fe0 CR3: 000000023cf9e006 CR4: 00000000001606f0
      [  899.891803] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  899.891804] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  899.891805] Call Trace:
      [  899.891830]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  899.891848]  start_transaction+0x9b/0x440 [btrfs]
      [  899.891865]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  899.891885]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  899.891890]  ? wait_woken+0x80/0x80
      [  899.891909]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  899.891927]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  899.891953]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  899.891958]  ? __check_object_size+0xfc/0x1a0
      [  899.891962]  do_vfs_ioctl+0xa1/0x5f0
      [  899.891964]  ? do_vfs_ioctl+0xa1/0x5f0
      [  899.891966]  ? do_fcntl+0x449/0x580
      [  899.891968]  ? do_sys_open+0x1b4/0x280
      [  899.891970]  SyS_ioctl+0x79/0x90
      [  899.891974]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  899.891976] RIP: 0033:0x558c21424324
      [  899.891976] RSP: 002b:000000c422372248 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  899.891978] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000558c21424324
      [  899.891979] RDX: 000000c4201af000 RSI: 0000000050009417 RDI: 0000000000000011
      [  899.891980] RBP: 000000c422372478 R08: 0000000000000000 R09: 0000000000000000
      [  899.891981] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  899.891982] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  899.891983] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  899.892016] ---[ end trace a43c996c7ae1c269 ]---
      [  903.269898] ------------[ cut here ]------------
      [  903.269933] WARNING: CPU: 0 PID: 24302 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  903.269934] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  903.269976] CPU: 0 PID: 24302 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  903.269977] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  903.269978] task: ffff9aa59fbc9740 task.stack: ffffbce784aa0000
      [  903.269997] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  903.269998] RSP: 0018:ffffbce784aa3b80 EFLAGS: 00010283
      [  903.270000] RAX: ffff9aa83dd42118 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  903.270001] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa860206168
      [  903.270002] RBP: ffffbce784aa3ba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206168
      [  903.270003] R10: 0000000000000000 R11: ffff9aa7fea99840 R12: ffff9aa860206168
      [  903.270004] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  903.270011] FS:  00007f95dc064ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  903.270012] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  903.270013] CR2: 000000c4217ce000 CR3: 000000017a65a006 CR4: 00000000001606f0
      [  903.270018] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  903.270019] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  903.270020] Call Trace:
      [  903.270040]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  903.270058]  start_transaction+0x9b/0x440 [btrfs]
      [  903.270075]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  903.270094]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  903.270098]  ? wait_woken+0x80/0x80
      [  903.270117]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  903.270135]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  903.270153]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  903.270157]  ? __check_object_size+0xfc/0x1a0
      [  903.270160]  do_vfs_ioctl+0xa1/0x5f0
      [  903.270162]  ? do_vfs_ioctl+0xa1/0x5f0
      [  903.270164]  ? do_fcntl+0x449/0x580
      [  903.270167]  ? do_sys_open+0x1b4/0x280
      [  903.270169]  SyS_ioctl+0x79/0x90
      [  903.270172]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  903.270173] RIP: 0033:0x556de0ed4324
      [  903.270174] RSP: 002b:000000c421f0c2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  903.270176] RAX: ffffffffffffffda RBX: 00007f95dc064a00 RCX: 0000556de0ed4324
      [  903.270177] RDX: 000000c4204d7000 RSI: 0000000050009417 RDI: 0000000000000011
      [  903.270178] RBP: 00007f95dc064980 R08: 0000000000000000 R09: 0000000000000000
      [  903.270179] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  903.270180] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  903.270182] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  903.270215] ---[ end trace a43c996c7ae1c26a ]---
      [  904.525331] ------------[ cut here ]------------
      [  904.525360] WARNING: CPU: 3 PID: 24931 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  904.525361] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  904.525401] CPU: 3 PID: 24931 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  904.525402] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  904.525404] task: ffff9aa48c6d1740 task.stack: ffffbce786070000
      [  904.525421] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  904.525422] RSP: 0018:ffffbce786073c98 EFLAGS: 00010287
      [  904.525424] RAX: ffff9aa7f4e05a40 RBX: ffff9aa4bdfec800 RCX: 0000000000000000
      [  904.525425] RDX: 0000000000000000 RSI: ffff9aa4bdfec800 RDI: ffff9aa8603450f0
      [  904.525426] RBP: ffffbce786073cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  904.525427] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa8603450f0
      [  904.525428] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa67b4c6000
      [  904.525430] FS:  00007f2650f37ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  904.525431] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  904.525432] CR2: 000000c421e71e80 CR3: 0000000120318005 CR4: 00000000001606e0
      [  904.525436] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  904.525437] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  904.525438] Call Trace:
      [  904.525457]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  904.525475]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  904.525494]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  904.525498]  ? __check_object_size+0xfc/0x1a0
      [  904.525500]  ? dput+0xc7/0x1f0
      [  904.525503]  do_vfs_ioctl+0xa1/0x5f0
      [  904.525505]  ? do_vfs_ioctl+0xa1/0x5f0
      [  904.525507]  ? ____fput+0xe/0x10
      [  904.525509]  ? task_work_run+0x83/0xa0
      [  904.525511]  SyS_ioctl+0x79/0x90
      [  904.525515]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  904.525516] RIP: 0033:0x560dc5106324
      [  904.525517] RSP: 002b:000000c421fef8b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  904.525519] RAX: ffffffffffffffda RBX: 00007f2650f37ae8 RCX: 0000560dc5106324
      [  904.525520] RDX: 000000c421fef918 RSI: 000000005000940f RDI: 0000000000000010
      [  904.525521] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  904.525522] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c421ff2000
      [  904.525523] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  904.525525] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  904.525557] ---[ end trace a43c996c7ae1c26b ]---
      [  904.789626] ------------[ cut here ]------------
      [  904.789659] WARNING: CPU: 0 PID: 24931 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  904.789659] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  904.789702] CPU: 0 PID: 24931 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  904.789704] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  904.789705] task: ffff9aa48c6d1740 task.stack: ffffbce786070000
      [  904.789724] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  904.789725] RSP: 0018:ffffbce786073b80 EFLAGS: 00010283
      [  904.789726] RAX: ffff9aa812c2f810 RBX: ffff9aa4fa21c800 RCX: 0000000000000000
      [  904.789727] RDX: 0000000000000000 RSI: ffff9aa4fa21c800 RDI: ffff9aa860206528
      [  904.789728] RBP: ffffbce786073ba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206528
      [  904.789729] R10: 0000000000000000 R11: ffff9aa741f4aa80 R12: ffff9aa860206528
      [  904.789730] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4fa21c800
      [  904.789731] FS:  00007f2650f37ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  904.789732] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  904.789733] CR2: 0000000000000000 CR3: 0000000120318001 CR4: 00000000001606f0
      [  904.789738] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  904.789739] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  904.789740] Call Trace:
      [  904.789760]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  904.789777]  start_transaction+0x9b/0x440 [btrfs]
      [  904.789793]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  904.789812]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  904.789819]  ? wait_woken+0x80/0x80
      [  904.789836]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  904.789853]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  904.789874]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  904.789879]  ? __check_object_size+0xfc/0x1a0
      [  904.789883]  do_vfs_ioctl+0xa1/0x5f0
      [  904.789885]  ? do_vfs_ioctl+0xa1/0x5f0
      [  904.789887]  ? do_fcntl+0x449/0x580
      [  904.789889]  ? do_sys_open+0x1b4/0x280
      [  904.789891]  SyS_ioctl+0x79/0x90
      [  904.789894]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  904.789896] RIP: 0033:0x560dc5106324
      [  904.789897] RSP: 002b:000000c421feffc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  904.789898] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000560dc5106324
      [  904.789899] RDX: 000000c4218c4000 RSI: 0000000050009417 RDI: 0000000000000011
      [  904.789900] RBP: 000000c421ff00a0 R08: 0000000000000000 R09: 0000000000000000
      [  904.789901] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  904.789902] R13: 0000000000000020 R14: 00000000000000dd R15: 0000000000000047
      [  904.789903] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  904.789937] ---[ end trace a43c996c7ae1c26c ]---
      [  906.344019] ------------[ cut here ]------------
      [  906.344055] WARNING: CPU: 3 PID: 15012 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  906.344056] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  906.344097] CPU: 3 PID: 15012 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  906.344098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  906.344099] task: ffff9aa5a3ab1740 task.stack: ffffbce7843f0000
      [  906.344118] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  906.344119] RSP: 0018:ffffbce7843f3c98 EFLAGS: 00010287
      [  906.344121] RAX: ffff9aa64d916118 RBX: ffff9aa784c20000 RCX: 0000000000000000
      [  906.344122] RDX: 0000000000000000 RSI: ffff9aa784c20000 RDI: ffff9aa8602068e8
      [  906.344123] RBP: ffffbce7843f3cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  906.344124] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa8602068e8
      [  906.344125] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa817906000
      [  906.344127] FS:  00007f23d6d3cae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  906.344128] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  906.344129] CR2: 000000c42042e010 CR3: 000000009992a006 CR4: 00000000001606e0
      [  906.344134] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  906.344134] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  906.344135] Call Trace:
      [  906.344155]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  906.344174]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  906.344192]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  906.344196]  ? __check_object_size+0xfc/0x1a0
      [  906.344199]  ? dput+0xc7/0x1f0
      [  906.344201]  do_vfs_ioctl+0xa1/0x5f0
      [  906.344203]  ? do_vfs_ioctl+0xa1/0x5f0
      [  906.344205]  ? ____fput+0xe/0x10
      [  906.344208]  ? task_work_run+0x83/0xa0
      [  906.344210]  SyS_ioctl+0x79/0x90
      [  906.344213]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  906.344214] RIP: 0033:0x559a0e982324
      [  906.344215] RSP: 002b:000000c4218138b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  906.344217] RAX: ffffffffffffffda RBX: 00007f23d6d3cae8 RCX: 0000559a0e982324
      [  906.344218] RDX: 000000c421813918 RSI: 000000005000940f RDI: 0000000000000010
      [  906.344219] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  906.344220] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c421816000
      [  906.344221] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  906.344223] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  906.344254] ---[ end trace a43c996c7ae1c26d ]---
      [  908.798643] ------------[ cut here ]------------
      [  908.798671] WARNING: CPU: 1 PID: 16856 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  908.798672] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  908.798708] CPU: 1 PID: 16856 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  908.798709] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  908.798710] task: ffff9aa50cf01740 task.stack: ffffbce785228000
      [  908.798729] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  908.798730] RSP: 0018:ffffbce78522bc98 EFLAGS: 00010206
      [  908.798731] RAX: ffff9aa515f268c0 RBX: ffff9aa687b7d800 RCX: 0000000000000000
      [  908.798732] RDX: 0000000000000000 RSI: ffff9aa687b7d800 RDI: ffff9aa860380c30
      [  908.798732] RBP: ffffbce78522bcc0 R08: 0000423f00001270 R09: 0000000000000000
      [  908.798733] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860380c30
      [  908.798734] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4ccb2c000
      [  908.798735] FS:  00007f0bb66e3ae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  908.798736] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  908.798737] CR2: 000000c4204d8000 CR3: 000000006d90c005 CR4: 00000000001606e0
      [  908.798742] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  908.798742] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  908.798743] Call Trace:
      [  908.798762]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  908.798781]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  908.798798]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  908.798804]  ? __check_object_size+0xfc/0x1a0
      [  908.798806]  ? dput+0xc7/0x1f0
      [  908.798808]  do_vfs_ioctl+0xa1/0x5f0
      [  908.798810]  ? do_vfs_ioctl+0xa1/0x5f0
      [  908.798812]  ? ____fput+0xe/0x10
      [  908.798814]  ? task_work_run+0x83/0xa0
      [  908.798816]  SyS_ioctl+0x79/0x90
      [  908.798820]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  908.798821] RIP: 0033:0x55c987016324
      [  908.798822] RSP: 002b:000000c421f958b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  908.798823] RAX: ffffffffffffffda RBX: 00007f0bb66e3ae8 RCX: 000055c987016324
      [  908.798824] RDX: 000000c421f95918 RSI: 000000005000940f RDI: 0000000000000010
      [  908.798825] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  908.798826] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c421f98000
      [  908.798826] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  908.798828] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  908.798855] ---[ end trace a43c996c7ae1c26e ]---
      [  909.307933] ------------[ cut here ]------------
      [  909.307967] WARNING: CPU: 3 PID: 17632 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  909.307968] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  909.308008] CPU: 3 PID: 17632 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  909.308010] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  909.308011] task: ffff9aa6107845c0 task.stack: ffffbce782fb8000
      [  909.308030] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  909.308031] RSP: 0018:ffffbce782fbbb80 EFLAGS: 00010206
      [  909.308033] RAX: ffff9aa4d6080d20 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  909.308034] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa860345960
      [  909.308035] RBP: ffffbce782fbbba8 R08: 0000000000000001 R09: 0000000000000000
      [  909.308035] R10: 0000000000000254 R11: 00000000000001de R12: ffff9aa860345960
      [  909.308037] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  909.308038] FS:  00007f95dc0caae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  909.308039] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  909.308040] CR2: 000000c420339020 CR3: 000000017a65a001 CR4: 00000000001606e0
      [  909.308045] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  909.308046] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  909.308047] Call Trace:
      [  909.308067]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  909.308084]  start_transaction+0x9b/0x440 [btrfs]
      [  909.308101]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  909.308120]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  909.308124]  ? wait_woken+0x80/0x80
      [  909.308143]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  909.308160]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  909.308178]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  909.308182]  ? __check_object_size+0xfc/0x1a0
      [  909.308185]  do_vfs_ioctl+0xa1/0x5f0
      [  909.308187]  ? do_vfs_ioctl+0xa1/0x5f0
      [  909.308189]  ? do_fcntl+0x449/0x580
      [  909.308191]  ? do_sys_open+0x1b4/0x280
      [  909.308193]  SyS_ioctl+0x79/0x90
      [  909.308196]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  909.308198] RIP: 0033:0x556de0ed4324
      [  909.308199] RSP: 002b:000000c421f0c2e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  909.308201] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  909.308202] RDX: 000000c4204d7000 RSI: 0000000050009417 RDI: 0000000000000011
      [  909.308203] RBP: 000000c421f0c518 R08: 0000000000000000 R09: 0000000000000000
      [  909.308203] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  909.308204] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  909.308206] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  909.308239] ---[ end trace a43c996c7ae1c26f ]---
      [  909.397919] ------------[ cut here ]------------
      [  909.397948] WARNING: CPU: 0 PID: 15543 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  909.397949] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  909.398016] CPU: 0 PID: 15543 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  909.398017] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  909.398018] task: ffff9aa7d00e1740 task.stack: ffffbce784240000
      [  909.398034] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  909.398035] RSP: 0018:ffffbce784243b80 EFLAGS: 00010202
      [  909.398037] RAX: ffff9aa519843c70 RBX: ffff9aa4bdfa3800 RCX: 0000000000000000
      [  909.398038] RDX: 0000000000000000 RSI: ffff9aa4bdfa3800 RDI: ffff9aa860206c30
      [  909.398039] RBP: ffffbce784243ba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206c30
      [  909.398040] R10: 0000000000000000 R11: ffff9aa5d215acc0 R12: ffff9aa860206c30
      [  909.398040] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa3800
      [  909.398042] FS:  00007fcec5df0ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  909.398043] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  909.398044] CR2: 00007fcec59be310 CR3: 00000000b5b6a005 CR4: 00000000001606f0
      [  909.398048] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  909.398049] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  909.398050] Call Trace:
      [  909.398068]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  909.398083]  start_transaction+0x9b/0x440 [btrfs]
      [  909.398097]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  909.398114]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  909.398119]  ? wait_woken+0x80/0x80
      [  909.398135]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  909.398150]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  909.398166]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  909.398170]  ? __check_object_size+0xfc/0x1a0
      [  909.398173]  do_vfs_ioctl+0xa1/0x5f0
      [  909.398175]  ? do_vfs_ioctl+0xa1/0x5f0
      [  909.398177]  ? do_fcntl+0x449/0x580
      [  909.398179]  ? do_sys_open+0x1b4/0x280
      [  909.398181]  SyS_ioctl+0x79/0x90
      [  909.398184]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  909.398185] RIP: 0033:0x55c78cc81324
      [  909.398186] RSP: 002b:000000c4221862e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  909.398188] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c78cc81324
      [  909.398189] RDX: 000000c42012d000 RSI: 0000000050009417 RDI: 0000000000000011
      [  909.398189] RBP: 000000c422186518 R08: 0000000000000000 R09: 0000000000000000
      [  909.398190] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  909.398191] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  909.398192] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  909.398221] ---[ end trace a43c996c7ae1c270 ]---
      [  911.037341] ------------[ cut here ]------------
      [  911.037373] WARNING: CPU: 2 PID: 16685 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  911.037374] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  911.037414] CPU: 2 PID: 16685 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  911.037415] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  911.037416] task: ffff9aa49cbf2e80 task.stack: ffffbce785068000
      [  911.037433] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  911.037434] RSP: 0018:ffffbce78506bb80 EFLAGS: 00010212
      [  911.037436] RAX: ffff9aa714b329d8 RBX: ffff9aa50b53f800 RCX: 0000000000000000
      [  911.037437] RDX: 0000000000000000 RSI: ffff9aa50b53f800 RDI: ffff9aa86024e708
      [  911.037437] RBP: ffffbce78506bba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024e708
      [  911.037438] R10: 0000000000000000 R11: ffff9aa58cc12540 R12: ffff9aa86024e708
      [  911.037439] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53f800
      [  911.037441] FS:  00007f0bb673aae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  911.037442] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  911.037443] CR2: 00007f0bb67db668 CR3: 000000006d90c003 CR4: 00000000001606e0
      [  911.037447] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  911.037448] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  911.037449] Call Trace:
      [  911.037468]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  911.037483]  start_transaction+0x9b/0x440 [btrfs]
      [  911.037498]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  911.037516]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  911.037521]  ? wait_woken+0x80/0x80
      [  911.037538]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  911.037554]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  911.037570]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  911.037573]  ? __check_object_size+0xfc/0x1a0
      [  911.037576]  do_vfs_ioctl+0xa1/0x5f0
      [  911.037578]  ? do_vfs_ioctl+0xa1/0x5f0
      [  911.037580]  ? do_fcntl+0x449/0x580
      [  911.037582]  ? do_sys_open+0x1b4/0x280
      [  911.037584]  SyS_ioctl+0x79/0x90
      [  911.037587]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  911.037589] RIP: 0033:0x55c987016324
      [  911.037590] RSP: 002b:000000c421f962e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  911.037591] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c987016324
      [  911.037592] RDX: 000000c420867000 RSI: 0000000050009417 RDI: 0000000000000011
      [  911.037593] RBP: 000000c421f96518 R08: 0000000000000000 R09: 0000000000000000
      [  911.037594] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  911.037595] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
      [  911.037596] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  911.037627] ---[ end trace a43c996c7ae1c271 ]---
      [  911.333445] ------------[ cut here ]------------
      [  911.333474] WARNING: CPU: 0 PID: 18429 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  911.333475] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  911.333513] CPU: 0 PID: 18429 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  911.333514] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  911.333515] task: ffff9aa520f91740 task.stack: ffffbce784f30000
      [  911.333533] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  911.333534] RSP: 0018:ffffbce784f33c98 EFLAGS: 00010206
      [  911.333536] RAX: ffff9aa488714690 RBX: ffff9aa50859a000 RCX: 0000000000000000
      [  911.333537] RDX: 0000000000000000 RSI: ffff9aa50859a000 RDI: ffff9aa860206a50
      [  911.333538] RBP: ffffbce784f33cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  911.333539] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860206a50
      [  911.333540] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4dcb89000
      [  911.333541] FS:  00007f46a14d1ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  911.333542] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  911.333543] CR2: 000000c421adb000 CR3: 000000007f428001 CR4: 00000000001606f0
      [  911.333548] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  911.333548] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  911.333549] Call Trace:
      [  911.333569]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  911.333589]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  911.333611]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  911.333615]  ? futex_wake+0x90/0x170
      [  911.333621]  do_vfs_ioctl+0xa1/0x5f0
      [  911.333623]  ? do_vfs_ioctl+0xa1/0x5f0
      [  911.333624]  ? SyS_futex+0x7f/0x180
      [  911.333626]  SyS_ioctl+0x79/0x90
      [  911.333630]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  911.333632] RIP: 0033:0x56285c441324
      [  911.333632] RSP: 002b:000000c421f718b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  911.333634] RAX: ffffffffffffffda RBX: 00007f46a14d1ae8 RCX: 000056285c441324
      [  911.333635] RDX: 000000c421f71918 RSI: 000000005000940f RDI: 0000000000000010
      [  911.333636] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  911.333637] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c421f74000
      [  911.333638] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  911.333640] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  911.333669] ---[ end trace a43c996c7ae1c272 ]---
      [  911.945451] ------------[ cut here ]------------
      [  911.945481] WARNING: CPU: 3 PID: 16167 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  911.945482] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  911.945520] CPU: 3 PID: 16167 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  911.945521] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  911.945522] task: ffff9aa4ed8245c0 task.stack: ffffbce784938000
      [  911.945540] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  911.945541] RSP: 0018:ffffbce78493bb80 EFLAGS: 00010283
      [  911.945543] RAX: ffff9aa61d040af0 RBX: ffff9aa50b53e800 RCX: 0000000000000000
      [  911.945544] RDX: 0000000000000000 RSI: ffff9aa50b53e800 RDI: ffff9aa860345bb8
      [  911.945545] RBP: ffffbce78493bba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345bb8
      [  911.945545] R10: 0000000000000000 R11: ffff9aa712d15c00 R12: ffff9aa860345bb8
      [  911.945546] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53e800
      [  911.945548] FS:  00007febb337fae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  911.945549] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  911.945550] CR2: 000000c420189000 CR3: 0000000023c4e005 CR4: 00000000001606e0
      [  911.945555] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  911.945555] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  911.945556] Call Trace:
      [  911.945576]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  911.945593]  start_transaction+0x9b/0x440 [btrfs]
      [  911.945609]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  911.945627]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  911.945632]  ? wait_woken+0x80/0x80
      [  911.945649]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  911.945667]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  911.945683]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  911.945688]  ? __check_object_size+0xfc/0x1a0
      [  911.945692]  do_vfs_ioctl+0xa1/0x5f0
      [  911.945694]  ? do_vfs_ioctl+0xa1/0x5f0
      [  911.945696]  ? do_fcntl+0x449/0x580
      [  911.945698]  ? do_sys_open+0x1b4/0x280
      [  911.945700]  SyS_ioctl+0x79/0x90
      [  911.945704]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  911.945705] RIP: 0033:0x55fcab0b0324
      [  911.945706] RSP: 002b:000000c4223b5f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  911.945708] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055fcab0b0324
      [  911.945709] RDX: 000000c421bd8000 RSI: 0000000050009417 RDI: 0000000000000011
      [  911.945710] RBP: 000000c4223b61f8 R08: 0000000000000000 R09: 0000000000000000
      [  911.945710] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  911.945711] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  911.945713] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  911.945741] ---[ end trace a43c996c7ae1c273 ]---
      [  912.239074] ------------[ cut here ]------------
      [  912.239105] WARNING: CPU: 1 PID: 15543 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.239106] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  912.239150] CPU: 1 PID: 15543 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  912.239151] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  912.239153] task: ffff9aa7d00e1740 task.stack: ffffbce784240000
      [  912.239171] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.239172] RSP: 0018:ffffbce784243b80 EFLAGS: 00010202
      [  912.239173] RAX: ffff9aa4a8afeaf0 RBX: ffff9aa4bdfa3800 RCX: 0000000000000000
      [  912.239174] RDX: 0000000000000000 RSI: ffff9aa4bdfa3800 RDI: ffff9aa860380f78
      [  912.239175] RBP: ffffbce784243ba8 R08: ffffdce77fc80cc0 R09: ffff9aa860380f78
      [  912.239176] R10: 0000000000000000 R11: ffff9aa7a4d2b0c0 R12: ffff9aa860380f78
      [  912.239177] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa3800
      [  912.239179] FS:  00007fcec5df0ae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  912.239180] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  912.239181] CR2: 000000c420583048 CR3: 00000000b5b6a002 CR4: 00000000001606e0
      [  912.239185] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  912.239186] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  912.239187] Call Trace:
      [  912.239208]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  912.239225]  start_transaction+0x9b/0x440 [btrfs]
      [  912.239241]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  912.239259]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  912.239264]  ? wait_woken+0x80/0x80
      [  912.239283]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  912.239300]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  912.239317]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  912.239321]  ? __check_object_size+0xfc/0x1a0
      [  912.239326]  do_vfs_ioctl+0xa1/0x5f0
      [  912.239328]  ? do_vfs_ioctl+0xa1/0x5f0
      [  912.239330]  ? do_fcntl+0x449/0x580
      [  912.239332]  ? do_sys_open+0x1b4/0x280
      [  912.239334]  SyS_ioctl+0x79/0x90
      [  912.239338]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  912.239339] RIP: 0033:0x55c78cc81324
      [  912.239340] RSP: 002b:000000c422185f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  912.239342] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c78cc81324
      [  912.239343] RDX: 000000c4224f0000 RSI: 0000000050009417 RDI: 0000000000000011
      [  912.239344] RBP: 000000c4221861f8 R08: 0000000000000000 R09: 0000000000000000
      [  912.239345] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  912.239346] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  912.239348] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  912.239386] ---[ end trace a43c996c7ae1c274 ]---
      [  912.570278] ------------[ cut here ]------------
      [  912.570307] WARNING: CPU: 0 PID: 16505 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.570308] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  912.570348] CPU: 0 PID: 16505 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  912.570349] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  912.570350] task: ffff9aa50b7d9740 task.stack: ffffbce784d90000
      [  912.570378] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.570379] RSP: 0018:ffffbce784d93c98 EFLAGS: 00010283
      [  912.570381] RAX: ffff9aa65278b3b0 RBX: ffff9aa508598000 RCX: 0000000000000000
      [  912.570382] RDX: 0000000000000000 RSI: ffff9aa508598000 RDI: ffff9aa8602065a0
      [  912.570383] RBP: ffffbce784d93cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  912.570384] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa8602065a0
      [  912.570385] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5faa14000
      [  912.570386] FS:  00007f0bb6daeb88(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  912.570387] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  912.570388] CR2: 000000c420c47548 CR3: 000000006d90c003 CR4: 00000000001606f0
      [  912.570392] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  912.570393] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  912.570394] Call Trace:
      [  912.570415]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  912.570435]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  912.570457]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  912.570462]  ? futex_wake+0x90/0x170
      [  912.570468]  do_vfs_ioctl+0xa1/0x5f0
      [  912.570470]  ? do_vfs_ioctl+0xa1/0x5f0
      [  912.570472]  ? SyS_futex+0x7f/0x180
      [  912.570474]  SyS_ioctl+0x79/0x90
      [  912.570478]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  912.570480] RIP: 0033:0x55c987016324
      [  912.570481] RSP: 002b:000000c421f958b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  912.570483] RAX: ffffffffffffffda RBX: 00007f0bb6daeb88 RCX: 000055c987016324
      [  912.570484] RDX: 000000c421f95918 RSI: 000000005000940f RDI: 0000000000000010
      [  912.570485] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  912.570486] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c421f98000
      [  912.570487] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  912.570489] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  912.570522] ---[ end trace a43c996c7ae1c275 ]---
      [  912.695507] ------------[ cut here ]------------
      [  912.695546] WARNING: CPU: 0 PID: 16505 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.695547] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  912.695586] CPU: 0 PID: 16505 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  912.695587] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  912.695588] task: ffff9aa50b7d9740 task.stack: ffffbce784d90000
      [  912.695604] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.695605] RSP: 0018:ffffbce784d93b80 EFLAGS: 00010202
      [  912.695606] RAX: ffff9aa594bb0230 RBX: ffff9aa50b53f800 RCX: 0000000000000000
      [  912.695607] RDX: 0000000000000000 RSI: ffff9aa50b53f800 RDI: ffff9aa8602062d0
      [  912.695608] RBP: ffffbce784d93ba8 R08: ffffdce77fc00cc0 R09: ffff9aa8602062d0
      [  912.695609] R10: 0000000000000000 R11: ffff9aa7b2f95900 R12: ffff9aa8602062d0
      [  912.695610] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53f800
      [  912.695611] FS:  00007f0bb6daeb88(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  912.695612] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  912.695613] CR2: 000000c420654020 CR3: 000000006d90c003 CR4: 00000000001606f0
      [  912.695617] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  912.695618] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  912.695619] Call Trace:
      [  912.695638]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  912.695655]  start_transaction+0x9b/0x440 [btrfs]
      [  912.695672]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  912.695689]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  912.695694]  ? wait_woken+0x80/0x80
      [  912.695722]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  912.695739]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  912.695757]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  912.695761]  ? __check_object_size+0xfc/0x1a0
      [  912.695765]  do_vfs_ioctl+0xa1/0x5f0
      [  912.695767]  ? do_vfs_ioctl+0xa1/0x5f0
      [  912.695768]  ? do_fcntl+0x449/0x580
      [  912.695770]  ? do_sys_open+0x1b4/0x280
      [  912.695772]  SyS_ioctl+0x79/0x90
      [  912.695776]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  912.695778] RIP: 0033:0x55c987016324
      [  912.695779] RSP: 002b:000000c421f95fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  912.695781] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c987016324
      [  912.695782] RDX: 000000c421a2e000 RSI: 0000000050009417 RDI: 0000000000000011
      [  912.695782] RBP: 000000c421f96248 R08: 0000000000000000 R09: 0000000000000000
      [  912.695783] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  912.695784] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  912.695786] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  912.695814] ---[ end trace a43c996c7ae1c276 ]---
      [  912.770551] ------------[ cut here ]------------
      [  912.770579] WARNING: CPU: 3 PID: 27772 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.770580] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  912.770621] CPU: 3 PID: 27772 Comm: btrfs Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  912.770622] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  912.770623] task: ffff9aa6c66c8000 task.stack: ffffbce783308000
      [  912.770641] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  912.770642] RSP: 0018:ffffbce78330bb80 EFLAGS: 00010206
      [  912.770644] RAX: ffff9aa4992b7a40 RBX: ffff9aa787367000 RCX: 0000000000000000
      [  912.770645] RDX: 0000000000000000 RSI: ffff9aa787367000 RDI: ffff9aa860345960
      [  912.770646] RBP: ffffbce78330bba8 R08: 0000000000000003 R09: ffff9aa869dfa800
      [  912.770647] R10: ffffbce78591b568 R11: 0000000000000199 R12: ffff9aa860345960
      [  912.770648] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa787367000
      [  912.770650] FS:  00000000026e9a00(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  912.770651] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  912.770652] CR2: 000000c42057a000 CR3: 0000000390c84003 CR4: 00000000001606e0
      [  912.770656] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  912.770657] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  912.770657] Call Trace:
      [  912.770677]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  912.770694]  start_transaction+0x9b/0x440 [btrfs]
      [  912.770710]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  912.770729]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  912.770735]  ? wait_woken+0x80/0x80
      [  912.770754]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  912.770772]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  912.770791]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  912.770793]  ? set_next_entity+0xd9/0x220
      [  912.770795]  ? pick_next_task_fair+0x443/0x560
      [  912.770799]  ? __switch_to+0x13f/0x530
      [  912.770804]  do_vfs_ioctl+0xa1/0x5f0
      [  912.770805]  ? do_vfs_ioctl+0xa1/0x5f0
      [  912.770808]  SyS_ioctl+0x79/0x90
      [  912.770812]  ? page_fault+0x36/0x60
      [  912.770814]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  912.770815] RIP: 0033:0x4f4677
      [  912.770816] RSP: 002b:00007ffe185f7c18 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
      [  912.770818] RAX: ffffffffffffffda RBX: 0000000000000063 RCX: 00000000004f4677
      [  912.770819] RDX: 00007ffe185f7c60 RSI: 0000000050009417 RDI: 0000000000000003
      [  912.770820] RBP: 0000000000002710 R08: 0000000000000000 R09: 00000000000000ae
      [  912.770821] R10: 000000000000000f R11: 0000000000000202 R12: 0000000000001010
      [  912.770822] R13: 00000000007a3098 R14: 00000000026fbea0 R15: 00000000007a3040
      [  912.770823] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  912.770857] ---[ end trace a43c996c7ae1c277 ]---
      [  913.822834] ------------[ cut here ]------------
      [  913.822874] WARNING: CPU: 3 PID: 14770 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  913.822875] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  913.822923] CPU: 3 PID: 14770 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  913.822924] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  913.822925] task: ffff9aa5a3578000 task.stack: ffffbce783a50000
      [  913.822946] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  913.822948] RSP: 0018:ffffbce783a53c98 EFLAGS: 00010216
      [  913.822949] RAX: ffff9aa594f15928 RBX: ffff9aa787366800 RCX: 0000000000000000
      [  913.822950] RDX: 0000000000000000 RSI: ffff9aa787366800 RDI: ffff9aa860345960
      [  913.822951] RBP: ffffbce783a53cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  913.822952] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860345960
      [  913.822953] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa48a241000
      [  913.822955] FS:  00007f23d6e68ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  913.822956] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  913.822957] CR2: 000000c42000f000 CR3: 000000009992a005 CR4: 00000000001606e0
      [  913.822962] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  913.822963] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  913.822963] Call Trace:
      [  913.822984]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  913.823003]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  913.823021]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  913.823025]  ? set_next_entity+0xd9/0x220
      [  913.823027]  ? pick_next_task_fair+0x443/0x560
      [  913.823030]  ? __switch_to+0x13f/0x530
      [  913.823033]  do_vfs_ioctl+0xa1/0x5f0
      [  913.823036]  ? __schedule+0x3ca/0x890
      [  913.823038]  ? do_vfs_ioctl+0xa1/0x5f0
      [  913.823041]  SyS_ioctl+0x79/0x90
      [  913.823043]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  913.823044] RIP: 0033:0x559a0e982324
      [  913.823045] RSP: 002b:000000c4218138b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  913.823047] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000559a0e982324
      [  913.823048] RDX: 000000c421813918 RSI: 000000005000940f RDI: 0000000000000010
      [  913.823049] RBP: 000000c421814ab0 R08: 0000000000000000 R09: 0000000000000000
      [  913.823050] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  913.823051] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  913.823053] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  913.823086] ---[ end trace a43c996c7ae1c278 ]---
      [  913.878116] ------------[ cut here ]------------
      [  913.878146] WARNING: CPU: 3 PID: 14770 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  913.878147] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  913.878187] CPU: 3 PID: 14770 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  913.878188] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  913.878189] task: ffff9aa5a3578000 task.stack: ffffbce783a50000
      [  913.878207] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  913.878208] RSP: 0018:ffffbce783a53b80 EFLAGS: 00010206
      [  913.878210] RAX: ffff9aa7e9befea0 RBX: ffff9aa59a88e800 RCX: 0000000000000000
      [  913.878211] RDX: 0000000000000000 RSI: ffff9aa59a88e800 RDI: ffff9aa860345960
      [  913.878212] RBP: ffffbce783a53ba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345960
      [  913.878213] R10: 0000000000000000 R11: ffff9aa59599b900 R12: ffff9aa860345960
      [  913.878213] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa59a88e800
      [  913.878215] FS:  00007f23d6e68ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  913.878216] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  913.878217] CR2: 00007fcd55b19bd0 CR3: 000000009992a003 CR4: 00000000001606e0
      [  913.878233] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  913.878234] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  913.878234] Call Trace:
      [  913.878254]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  913.878271]  start_transaction+0x9b/0x440 [btrfs]
      [  913.878288]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  913.878308]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  913.878314]  ? wait_woken+0x80/0x80
      [  913.878332]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  913.878360]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  913.878384]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  913.878389]  ? __check_object_size+0xfc/0x1a0
      [  913.878394]  do_vfs_ioctl+0xa1/0x5f0
      [  913.878396]  ? do_vfs_ioctl+0xa1/0x5f0
      [  913.878398]  ? do_fcntl+0x449/0x580
      [  913.878400]  ? do_sys_open+0x1b4/0x280
      [  913.878402]  SyS_ioctl+0x79/0x90
      [  913.878406]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  913.878408] RIP: 0033:0x559a0e982324
      [  913.878409] RSP: 002b:000000c421814288 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  913.878411] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000559a0e982324
      [  913.878412] RDX: 000000c421e37000 RSI: 0000000050009417 RDI: 0000000000000011
      [  913.878413] RBP: 000000c421814310 R08: 0000000000000000 R09: 0000000000000000
      [  913.878413] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  913.878414] R13: 0000000000000018 R14: 0000000000000055 R15: 0000000000000006
      [  913.878416] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  913.878446] ---[ end trace a43c996c7ae1c279 ]---
      [  914.802537] ------------[ cut here ]------------
      [  914.802583] WARNING: CPU: 3 PID: 17630 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  914.802584] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  914.802624] CPU: 3 PID: 17630 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  914.802625] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  914.802626] task: ffff9aa610785d00 task.stack: ffffbce782f00000
      [  914.802644] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  914.802646] RSP: 0018:ffffbce782f03b80 EFLAGS: 00010293
      [  914.802647] RAX: ffff9aa83e9a8578 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  914.802648] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa860345438
      [  914.802649] RBP: ffffbce782f03ba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345438
      [  914.802650] R10: 0000000000000000 R11: ffff9aa762b5ad80 R12: ffff9aa860345438
      [  914.802651] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  914.802653] FS:  00007f95dc0f8ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  914.802654] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  914.802654] CR2: 00007f15b45e75a0 CR3: 000000017a65a004 CR4: 00000000001606e0
      [  914.802659] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  914.802660] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  914.802661] Call Trace:
      [  914.802681]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  914.802698]  start_transaction+0x9b/0x440 [btrfs]
      [  914.802715]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  914.802734]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  914.802740]  ? wait_woken+0x80/0x80
      [  914.802758]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  914.802776]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  914.802794]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  914.802798]  ? __check_object_size+0xfc/0x1a0
      [  914.802803]  do_vfs_ioctl+0xa1/0x5f0
      [  914.802805]  ? do_vfs_ioctl+0xa1/0x5f0
      [  914.802807]  ? do_fcntl+0x449/0x580
      [  914.802809]  ? do_sys_open+0x1b4/0x280
      [  914.802811]  SyS_ioctl+0x79/0x90
      [  914.802815]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  914.802817] RIP: 0033:0x556de0ed4324
      [  914.802818] RSP: 002b:000000c421f0bfc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  914.802819] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  914.802820] RDX: 000000c421897000 RSI: 0000000050009417 RDI: 0000000000000011
      [  914.802821] RBP: 000000c421f0c248 R08: 0000000000000000 R09: 0000000000000000
      [  914.802822] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  914.802823] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  914.802824] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  914.802855] ---[ end trace a43c996c7ae1c27a ]---
      [  915.231576] ------------[ cut here ]------------
      [  915.231606] WARNING: CPU: 0 PID: 25494 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  915.231607] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  915.231646] CPU: 0 PID: 25494 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  915.231647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  915.231649] task: ffff9aa536e75d00 task.stack: ffffbce785978000
      [  915.231666] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  915.231667] RSP: 0018:ffffbce78597bb80 EFLAGS: 00010206
      [  915.231668] RAX: ffff9aa8123e2f50 RBX: ffff9aa5bf0f6800 RCX: 0000000000000000
      [  915.231669] RDX: 0000000000000000 RSI: ffff9aa5bf0f6800 RDI: ffff9aa860206ac8
      [  915.231670] RBP: ffffbce78597bba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206ac8
      [  915.231671] R10: 0000000000000000 R11: ffff9aa8208246c0 R12: ffff9aa860206ac8
      [  915.231672] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5bf0f6800
      [  915.231673] FS:  00007f5cd8cddae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  915.231674] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  915.231675] CR2: 000000c420166010 CR3: 00000000b695a003 CR4: 00000000001606f0
      [  915.231680] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  915.231681] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  915.231682] Call Trace:
      [  915.231700]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  915.231716]  start_transaction+0x9b/0x440 [btrfs]
      [  915.231730]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  915.231748]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  915.231753]  ? wait_woken+0x80/0x80
      [  915.231770]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  915.231786]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  915.231802]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  915.231806]  ? __check_object_size+0xfc/0x1a0
      [  915.231811]  do_vfs_ioctl+0xa1/0x5f0
      [  915.231813]  ? do_vfs_ioctl+0xa1/0x5f0
      [  915.231814]  ? do_fcntl+0x449/0x580
      [  915.231816]  ? do_sys_open+0x1b4/0x280
      [  915.231819]  SyS_ioctl+0x79/0x90
      [  915.231823]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  915.231824] RIP: 0033:0x56325a7da324
      [  915.231825] RSP: 002b:000000c422157f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  915.231827] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000056325a7da324
      [  915.231828] RDX: 000000c42219e000 RSI: 0000000050009417 RDI: 0000000000000011
      [  915.231829] RBP: 000000c422157eb0 R08: 0000000000000000 R09: 0000000000000000
      [  915.231830] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  915.231831] R13: 0000000000000018 R14: 0000000000000055 R15: 0000000000000006
      [  915.231832] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  915.231861] ---[ end trace a43c996c7ae1c27b ]---
      [  915.538611] ------------[ cut here ]------------
      [  915.538642] WARNING: CPU: 0 PID: 23096 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  915.538643] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  915.538683] CPU: 0 PID: 23096 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  915.538684] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  915.538685] task: ffff9aa520e2c5c0 task.stack: ffffbce785818000
      [  915.538704] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  915.538705] RSP: 0018:ffffbce78581bb80 EFLAGS: 00010202
      [  915.538707] RAX: ffff9aa4b65b2f50 RBX: ffff9aa50b53e800 RCX: 0000000000000000
      [  915.538708] RDX: 0000000000000000 RSI: ffff9aa50b53e800 RDI: ffff9aa860206870
      [  915.538709] RBP: ffffbce78581bba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206870
      [  915.538710] R10: 0000000000000000 R11: ffff9aa79ad900c0 R12: ffff9aa860206870
      [  915.538711] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53e800
      [  915.538713] FS:  00007febb2e97ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  915.538714] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  915.538715] CR2: 0000000000000000 CR3: 0000000023c4e006 CR4: 00000000001606f0
      [  915.538720] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  915.538721] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  915.538721] Call Trace:
      [  915.538742]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  915.538760]  start_transaction+0x9b/0x440 [btrfs]
      [  915.538777]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  915.538796]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  915.538801]  ? wait_woken+0x80/0x80
      [  915.538819]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  915.538836]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  915.538853]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  915.538857]  ? __check_object_size+0xfc/0x1a0
      [  915.538862]  do_vfs_ioctl+0xa1/0x5f0
      [  915.538864]  ? do_vfs_ioctl+0xa1/0x5f0
      [  915.538866]  ? do_fcntl+0x449/0x580
      [  915.538868]  ? do_sys_open+0x1b4/0x280
      [  915.538870]  SyS_ioctl+0x79/0x90
      [  915.538874]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  915.538876] RIP: 0033:0x55fcab0b0324
      [  915.538877] RSP: 002b:000000c4223b5f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  915.538878] RAX: ffffffffffffffda RBX: 000000005add5370 RCX: 000055fcab0b0324
      [  915.538879] RDX: 000000c42222e000 RSI: 0000000050009417 RDI: 0000000000000011
      [  915.538880] RBP: 000055fcac33a660 R08: 0000000000000000 R09: 0000000000000000
      [  915.538881] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000009022101
      [  915.538882] R13: 00000000c1c996ca R14: 00000000466d107b R15: 000000003cf662c6
      [  915.538883] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  915.538913] ---[ end trace a43c996c7ae1c27c ]---
      [  916.431593] ------------[ cut here ]------------
      [  916.431623] WARNING: CPU: 1 PID: 18897 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  916.431624] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  916.431660] CPU: 1 PID: 18897 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  916.431661] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  916.431662] task: ffff9aa4cb3a5d00 task.stack: ffffbce7839c0000
      [  916.431680] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  916.431681] RSP: 0000:ffffbce7839c3b80 EFLAGS: 00010206
      [  916.431682] RAX: ffff9aa5963ceaf0 RBX: ffff9aa5bf0f6800 RCX: 0000000000000000
      [  916.431683] RDX: 0000000000000000 RSI: ffff9aa5bf0f6800 RDI: ffff9aa8603808e8
      [  916.431683] RBP: ffffbce7839c3ba8 R08: ffffdce77fc80cc0 R09: ffff9aa8603808e8
      [  916.431684] R10: 0000000000000000 R11: ffff9aa67c408600 R12: ffff9aa8603808e8
      [  916.431685] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5bf0f6800
      [  916.431687] FS:  00007f5cd922cae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  916.431688] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  916.431688] CR2: 000000c421f6f000 CR3: 00000000b695a002 CR4: 00000000001606e0
      [  916.431692] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  916.431693] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  916.431694] Call Trace:
      [  916.431712]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  916.431726]  start_transaction+0x9b/0x440 [btrfs]
      [  916.431739]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  916.431756]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  916.431760]  ? wait_woken+0x80/0x80
      [  916.431776]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  916.431790]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  916.431806]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  916.431809]  ? __check_object_size+0xfc/0x1a0
      [  916.431813]  do_vfs_ioctl+0xa1/0x5f0
      [  916.431815]  ? do_vfs_ioctl+0xa1/0x5f0
      [  916.431816]  ? do_fcntl+0x449/0x580
      [  916.431818]  ? do_sys_open+0x1b4/0x280
      [  916.431820]  SyS_ioctl+0x79/0x90
      [  916.431824]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  916.431825] RIP: 0033:0x56325a7da324
      [  916.431826] RSP: 002b:000000c4221502e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  916.431827] RAX: ffffffffffffffda RBX: 00007f5cd922ca00 RCX: 000056325a7da324
      [  916.431828] RDX: 000000c4202f1000 RSI: 0000000050009417 RDI: 0000000000000011
      [  916.431829] RBP: 00007f5cd922c980 R08: 0000000000000000 R09: 0000000000000000
      [  916.431830] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  916.431831] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  916.431832] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  916.431858] ---[ end trace a43c996c7ae1c27d ]---
      [  917.313029] ------------[ cut here ]------------
      [  917.313060] WARNING: CPU: 1 PID: 15808 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  917.313061] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  917.313100] CPU: 1 PID: 15808 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  917.313101] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  917.313102] task: ffff9aa539b3ae80 task.stack: ffffbce7825b8000
      [  917.313120] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  917.313121] RSP: 0018:ffffbce7825bbb80 EFLAGS: 00010287
      [  917.313123] RAX: ffff9aa812c2f810 RBX: ffff9aa4bdfa3800 RCX: 0000000000000000
      [  917.313124] RDX: 0000000000000000 RSI: ffff9aa4bdfa3800 RDI: ffff9aa8603459d8
      [  917.313125] RBP: ffffbce7825bbba8 R08: 0000000000000003 R09: ffff9aa66ea38e11
      [  917.313125] R10: 000000000000035c R11: 0000000000000194 R12: ffff9aa8603459d8
      [  917.313126] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa3800
      [  917.313139] FS:  00007fcec58eaae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  917.313140] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  917.313141] CR2: 00007f39d0ff96f8 CR3: 00000000b5b6a003 CR4: 00000000001606e0
      [  917.313145] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  917.313146] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  917.313146] Call Trace:
      [  917.313177]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  917.313199]  start_transaction+0x9b/0x440 [btrfs]
      [  917.313226]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  917.313253]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  917.313263]  ? wait_woken+0x80/0x80
      [  917.313288]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  917.313313]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  917.313335]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  917.313344]  ? __check_object_size+0xfc/0x1a0
      [  917.313348]  do_vfs_ioctl+0xa1/0x5f0
      [  917.313350]  ? do_vfs_ioctl+0xa1/0x5f0
      [  917.313352]  ? do_fcntl+0x449/0x580
      [  917.313354]  ? do_sys_open+0x1b4/0x280
      [  917.313356]  SyS_ioctl+0x79/0x90
      [  917.313360]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  917.313361] RIP: 0033:0x55c78cc81324
      [  917.313362] RSP: 002b:000000c422185f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  917.313364] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c78cc81324
      [  917.313365] RDX: 000000c4217f6000 RSI: 0000000050009417 RDI: 0000000000000011
      [  917.313366] RBP: 000000c4221861f8 R08: 0000000000000000 R09: 0000000000000000
      [  917.313367] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  917.313368] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  917.313369] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  917.313420] ---[ end trace a43c996c7ae1c27e ]---
      [  918.747623] ------------[ cut here ]------------
      [  918.747651] WARNING: CPU: 2 PID: 18524 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  918.747652] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  918.747692] CPU: 2 PID: 18524 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  918.747693] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  918.747694] task: ffff9aa5010c0000 task.stack: ffffbce785080000
      [  918.747712] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  918.747714] RSP: 0018:ffffbce785083b80 EFLAGS: 00010283
      [  918.747715] RAX: ffff9aa7ffd47b58 RBX: ffff9aa53a12e000 RCX: 0000000000000000
      [  918.747716] RDX: 0000000000000000 RSI: ffff9aa53a12e000 RDI: ffff9aa86024ed98
      [  918.747717] RBP: ffffbce785083ba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024ed98
      [  918.747718] R10: 0000000000000000 R11: ffff9aa5fa08c840 R12: ffff9aa86024ed98
      [  918.747719] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa53a12e000
      [  918.747721] FS:  00007f46a14baae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  918.747722] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  918.747723] CR2: 000000c42006d000 CR3: 000000007f428002 CR4: 00000000001606e0
      [  918.747728] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  918.747729] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  918.747729] Call Trace:
      [  918.747749]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  918.747766]  start_transaction+0x9b/0x440 [btrfs]
      [  918.747783]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  918.747801]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  918.747805]  ? wait_woken+0x80/0x80
      [  918.747824]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  918.747841]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  918.747858]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  918.747862]  ? __check_object_size+0xfc/0x1a0
      [  918.747875]  do_vfs_ioctl+0xa1/0x5f0
      [  918.747877]  ? do_vfs_ioctl+0xa1/0x5f0
      [  918.747879]  ? do_fcntl+0x449/0x580
      [  918.747881]  ? do_sys_open+0x1b4/0x280
      [  918.747884]  SyS_ioctl+0x79/0x90
      [  918.747888]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  918.747889] RIP: 0033:0x56285c441324
      [  918.747890] RSP: 002b:000000c421f722e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  918.747892] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000056285c441324
      [  918.747893] RDX: 000000c4204a9000 RSI: 0000000050009417 RDI: 0000000000000011
      [  918.747894] RBP: 000000c421f72518 R08: 0000000000000000 R09: 0000000000000000
      [  918.747895] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  918.747895] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  918.747897] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  918.747925] ---[ end trace a43c996c7ae1c27f ]---
      [  919.506479] ------------[ cut here ]------------
      [  919.506508] WARNING: CPU: 1 PID: 15064 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  919.506509] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  919.506547] CPU: 1 PID: 15064 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  919.506548] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  919.506549] task: ffff9aa76f571740 task.stack: ffffbce784588000
      [  919.506567] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  919.506568] RSP: 0018:ffffbce78458bb80 EFLAGS: 00010283
      [  919.506570] RAX: ffff9aa7af826af0 RBX: ffff9aa4fa21c800 RCX: 0000000000000000
      [  919.506571] RDX: 0000000000000000 RSI: ffff9aa4fa21c800 RDI: ffff9aa8603803c0
      [  919.506572] RBP: ffffbce78458bba8 R08: ffffdce77fc80cc0 R09: ffff9aa8603803c0
      [  919.506573] R10: 0000000000000000 R11: ffff9aa712d1ec00 R12: ffff9aa8603803c0
      [  919.506574] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4fa21c800
      [  919.506575] FS:  00007f2650facae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  919.506576] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  919.506577] CR2: 000000c420467000 CR3: 0000000120318005 CR4: 00000000001606e0
      [  919.506581] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  919.506582] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  919.506583] Call Trace:
      [  919.506602]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  919.506618]  start_transaction+0x9b/0x440 [btrfs]
      [  919.506634]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  919.506651]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  919.506657]  ? wait_woken+0x80/0x80
      [  919.506675]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  919.506692]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  919.506708]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  919.506712]  ? __check_object_size+0xfc/0x1a0
      [  919.506716]  do_vfs_ioctl+0xa1/0x5f0
      [  919.506718]  ? do_vfs_ioctl+0xa1/0x5f0
      [  919.506720]  ? do_fcntl+0x449/0x580
      [  919.506722]  ? do_sys_open+0x1b4/0x280
      [  919.506724]  SyS_ioctl+0x79/0x90
      [  919.506728]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  919.506730] RIP: 0033:0x560dc5106324
      [  919.506731] RSP: 002b:000000c421ff0288 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  919.506733] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000560dc5106324
      [  919.506734] RDX: 000000c421133000 RSI: 0000000050009417 RDI: 0000000000000011
      [  919.506735] RBP: 000000c421ff0468 R08: 0000000000000000 R09: 0000000000000000
      [  919.506736] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  919.506737] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  919.506738] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  919.506767] ---[ end trace a43c996c7ae1c280 ]---
      [  921.758019] ------------[ cut here ]------------
      [  921.758048] WARNING: CPU: 3 PID: 25006 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  921.758049] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  921.758087] CPU: 3 PID: 25006 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  921.758088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  921.758089] task: ffff9aa5143d0000 task.stack: ffffbce7854b8000
      [  921.758107] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  921.758108] RSP: 0018:ffffbce7854bbb80 EFLAGS: 00010202
      [  921.758110] RAX: ffff9aa593cb3c70 RBX: ffff9aa4bdfa3800 RCX: 0000000000000000
      [  921.758110] RDX: 0000000000000000 RSI: ffff9aa4bdfa3800 RDI: ffff9aa860345f78
      [  921.758111] RBP: ffffbce7854bbba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345f78
      [  921.758112] R10: 0000000000000000 R11: ffff9aa6a60b5000 R12: ffff9aa860345f78
      [  921.758113] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa3800
      [  921.758115] FS:  00007fcec5835ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  921.758116] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  921.758117] CR2: 0000000000000000 CR3: 00000000b5b6a005 CR4: 00000000001606e0
      [  921.758122] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  921.758123] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  921.758123] Call Trace:
      [  921.758143]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  921.758159]  start_transaction+0x9b/0x440 [btrfs]
      [  921.758175]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  921.758193]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  921.758198]  ? wait_woken+0x80/0x80
      [  921.758215]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  921.758232]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  921.758249]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  921.758254]  ? __check_object_size+0xfc/0x1a0
      [  921.758259]  do_vfs_ioctl+0xa1/0x5f0
      [  921.758260]  ? do_vfs_ioctl+0xa1/0x5f0
      [  921.758263]  ? do_fcntl+0x449/0x580
      [  921.758265]  ? do_sys_open+0x1b4/0x280
      [  921.758267]  SyS_ioctl+0x79/0x90
      [  921.758271]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  921.758272] RIP: 0033:0x55c78cc81324
      [  921.758273] RSP: 002b:000000c422185ed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  921.758275] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c78cc81324
      [  921.758276] RDX: 000000c4221e5000 RSI: 0000000050009417 RDI: 0000000000000011
      [  921.758277] RBP: 000000c422186158 R08: 0000000000000000 R09: 0000000000000000
      [  921.758278] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  921.758279] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000001
      [  921.758280] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  921.758309] ---[ end trace a43c996c7ae1c281 ]---
      [  925.079486] ------------[ cut here ]------------
      [  925.079516] WARNING: CPU: 3 PID: 17633 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  925.079517] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  925.079555] CPU: 3 PID: 17633 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  925.079556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  925.079557] task: ffff9aa610782e80 task.stack: ffffbce782ff8000
      [  925.079575] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  925.079576] RSP: 0018:ffffbce782ffbb80 EFLAGS: 00010206
      [  925.079578] RAX: ffff9aa58ab6f180 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  925.079579] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa860345e88
      [  925.079579] RBP: ffffbce782ffbba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345e88
      [  925.079580] R10: 0000000000000000 R11: ffff9aa7a02d8c00 R12: ffff9aa860345e88
      [  925.079581] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  925.079583] FS:  00007f95dc0b3ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  925.079584] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  925.079585] CR2: 000000c420379000 CR3: 000000017a65a004 CR4: 00000000001606e0
      [  925.079589] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  925.079590] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  925.079590] Call Trace:
      [  925.079611]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  925.079628]  start_transaction+0x9b/0x440 [btrfs]
      [  925.079644]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  925.079662]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  925.079667]  ? wait_woken+0x80/0x80
      [  925.079685]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  925.079702]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  925.079718]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  925.079722]  ? __check_object_size+0xfc/0x1a0
      [  925.079727]  do_vfs_ioctl+0xa1/0x5f0
      [  925.079729]  ? do_vfs_ioctl+0xa1/0x5f0
      [  925.079730]  ? do_fcntl+0x449/0x580
      [  925.079732]  ? do_sys_open+0x1b4/0x280
      [  925.079734]  SyS_ioctl+0x79/0x90
      [  925.079738]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  925.079739] RIP: 0033:0x556de0ed4324
      [  925.079740] RSP: 002b:000000c421f0c338 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  925.079742] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  925.079743] RDX: 000000c4204d7000 RSI: 0000000050009417 RDI: 0000000000000011
      [  925.079744] RBP: 000000c421f0c568 R08: 0000000000000000 R09: 0000000000000000
      [  925.079745] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  925.079746] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  925.079747] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  925.079777] ---[ end trace a43c996c7ae1c282 ]---
      [  925.325190] ------------[ cut here ]------------
      [  925.325222] WARNING: CPU: 2 PID: 29020 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  925.325223] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  925.325264] CPU: 2 PID: 29020 Comm: btrfs Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  925.325265] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  925.325266] task: ffff9aa65efeae80 task.stack: ffffbce786008000
      [  925.325287] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  925.325288] RSP: 0018:ffffbce78600bc98 EFLAGS: 00010216
      [  925.325290] RAX: ffff9aa5079b96f8 RBX: ffff9aa7a0bc6800 RCX: 0000000000000000
      [  925.325291] RDX: 0000000000000000 RSI: ffff9aa7a0bc6800 RDI: ffff9aa86024e078
      [  925.325292] RBP: ffffbce78600bcc0 R08: 0000423f00001270 R09: 0000000000000000
      [  925.325293] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa86024e078
      [  925.325293] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4aaafa000
      [  925.325295] FS:  0000000002199a00(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  925.325296] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  925.325297] CR2: 000055d9bc02a078 CR3: 0000000056164006 CR4: 00000000001606e0
      [  925.325302] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  925.325303] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  925.325303] Call Trace:
      [  925.325326]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  925.325346]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  925.325365]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  925.325370]  ? lru_cache_add_active_or_unevictable+0x36/0xb0
      [  925.325374]  ? _copy_to_user+0x2a/0x40
      [  925.325377]  ? cp_new_stat+0x156/0x190
      [  925.325381]  do_vfs_ioctl+0xa1/0x5f0
      [  925.325383]  ? do_vfs_ioctl+0xa1/0x5f0
      [  925.325385]  ? SYSC_newfstat+0x44/0x70
      [  925.325387]  SyS_ioctl+0x79/0x90
      [  925.325391]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  925.325392] RIP: 0033:0x4f4677
      [  925.325393] RSP: 002b:00007ffc789bb748 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
      [  925.325394] RAX: ffffffffffffffda RBX: 0000000000577d40 RCX: 00000000004f4677
      [  925.325395] RDX: 00007ffc789bb7a0 RSI: 000000005000940f RDI: 0000000000000003
      [  925.325396] RBP: 00000000007a2b40 R08: 0000000000000000 R09: 00000000000000c2
      [  925.325397] R10: ffffffffffffffff R11: 0000000000000202 R12: 000000000053e400
      [  925.325398] R13: 0000000000000012 R14: 0000000000577d40 R15: 0000000000000012
      [  925.325400] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  925.325430] ---[ end trace a43c996c7ae1c283 ]---
      [  925.895482] ------------[ cut here ]------------
      [  925.895511] WARNING: CPU: 2 PID: 16031 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  925.895512] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  925.895554] CPU: 2 PID: 16031 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  925.895555] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  925.895556] task: ffff9aa48dfbc5c0 task.stack: ffffbce783db8000
      [  925.895575] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  925.895577] RSP: 0018:ffffbce783dbbb80 EFLAGS: 00010202
      [  925.895578] RAX: ffff9aa5d915f810 RBX: ffff9aa50b53e800 RCX: 0000000000000000
      [  925.895579] RDX: 0000000000000000 RSI: ffff9aa50b53e800 RDI: ffff9aa86024e780
      [  925.895580] RBP: ffffbce783dbbba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024e780
      [  925.895581] R10: 0000000000000000 R11: ffff9aa7b39e93c0 R12: ffff9aa86024e780
      [  925.895582] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53e800
      [  925.895584] FS:  00007febb34d9ae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  925.895585] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  925.895586] CR2: 000000c420349020 CR3: 0000000023c4e006 CR4: 00000000001606e0
      [  925.895591] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  925.895592] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  925.895593] Call Trace:
      [  925.895613]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  925.895631]  start_transaction+0x9b/0x440 [btrfs]
      [  925.895647]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  925.895665]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  925.895670]  ? wait_woken+0x80/0x80
      [  925.895688]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  925.895705]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  925.895723]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  925.895727]  ? __check_object_size+0xfc/0x1a0
      [  925.895731]  do_vfs_ioctl+0xa1/0x5f0
      [  925.895733]  ? do_vfs_ioctl+0xa1/0x5f0
      [  925.895735]  ? do_fcntl+0x449/0x580
      [  925.895737]  ? do_sys_open+0x1b4/0x280
      [  925.895739]  SyS_ioctl+0x79/0x90
      [  925.895743]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  925.895744] RIP: 0033:0x55fcab0b0324
      [  925.895745] RSP: 002b:000000c4223b5f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  925.895747] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055fcab0b0324
      [  925.895748] RDX: 000000c420e10000 RSI: 0000000050009417 RDI: 0000000000000011
      [  925.895749] RBP: 000000c4223b61f8 R08: 0000000000000000 R09: 0000000000000000
      [  925.895750] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  925.895751] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  925.895753] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  925.895787] ---[ end trace a43c996c7ae1c284 ]---
      [  928.259692] ------------[ cut here ]------------
      [  928.259722] WARNING: CPU: 0 PID: 16505 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  928.259723] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  928.259761] CPU: 0 PID: 16505 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  928.259762] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  928.259764] task: ffff9aa50b7d9740 task.stack: ffffbce784d90000
      [  928.259783] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  928.259784] RSP: 0018:ffffbce784d93c98 EFLAGS: 00010206
      [  928.259786] RAX: ffff9aa63733ee38 RBX: ffff9aa749831000 RCX: 0000000000000000
      [  928.259787] RDX: 0000000000000000 RSI: ffff9aa749831000 RDI: ffff9aa860206e10
      [  928.259788] RBP: ffffbce784d93cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  928.259789] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860206e10
      [  928.259789] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa65b81e000
      [  928.259791] FS:  00007f0bb6daeb88(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  928.259792] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  928.259793] CR2: 00007fe3209f4000 CR3: 000000006d90c001 CR4: 00000000001606f0
      [  928.259798] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  928.259798] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  928.259799] Call Trace:
      [  928.259819]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  928.259839]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  928.259859]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  928.259863]  ? set_next_entity+0xd9/0x220
      [  928.259865]  ? pick_next_task_fair+0x443/0x560
      [  928.259868]  ? __switch_to+0x13f/0x530
      [  928.259873]  do_vfs_ioctl+0xa1/0x5f0
      [  928.259877]  ? __schedule+0x3ca/0x890
      [  928.259879]  ? do_vfs_ioctl+0xa1/0x5f0
      [  928.259881]  SyS_ioctl+0x79/0x90
      [  928.259884]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  928.259885] RIP: 0033:0x55c987016324
      [  928.259886] RSP: 002b:000000c421f958b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  928.259888] RAX: ffffffffffffffda RBX: 00007fffdfbabdc8 RCX: 000055c987016324
      [  928.259889] RDX: 000000c421f95918 RSI: 000000005000940f RDI: 0000000000000010
      [  928.259890] RBP: 00007fffdfbabd48 R08: 0000000000000000 R09: 0000000000000000
      [  928.259891] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  928.259892] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  928.259893] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  928.259923] ---[ end trace a43c996c7ae1c285 ]---
      [  928.729265] ------------[ cut here ]------------
      [  928.729294] WARNING: CPU: 2 PID: 17584 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  928.729295] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  928.729334] CPU: 2 PID: 17584 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  928.729335] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  928.729336] task: ffff9aa62a68c5c0 task.stack: ffffbce782bb0000
      [  928.729354] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  928.729355] RSP: 0018:ffffbce782bb3c98 EFLAGS: 00010283
      [  928.729357] RAX: ffff9aa7dd7a2c08 RBX: ffff9aa79f8ca000 RCX: 0000000000000000
      [  928.729358] RDX: 0000000000000000 RSI: ffff9aa79f8ca000 RDI: ffff9aa86024e960
      [  928.729358] RBP: ffffbce782bb3cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  928.729359] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa86024e960
      [  928.729360] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4aaafb000
      [  928.729362] FS:  00007f95dc674ae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  928.729363] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  928.729364] CR2: 00007f15b4692f98 CR3: 000000017a65a001 CR4: 00000000001606e0
      [  928.729368] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  928.729369] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  928.729370] Call Trace:
      [  928.729389]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  928.729408]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  928.729426]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  928.729431]  ? __check_object_size+0xfc/0x1a0
      [  928.729434]  ? dput+0xc7/0x1f0
      [  928.729437]  do_vfs_ioctl+0xa1/0x5f0
      [  928.729439]  ? do_vfs_ioctl+0xa1/0x5f0
      [  928.729442]  ? ____fput+0xe/0x10
      [  928.729444]  ? task_work_run+0x83/0xa0
      [  928.729446]  SyS_ioctl+0x79/0x90
      [  928.729450]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  928.729452] RIP: 0033:0x556de0ed4324
      [  928.729452] RSP: 002b:000000c421f0b8b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  928.729454] RAX: ffffffffffffffda RBX: 00007f95dc674ae8 RCX: 0000556de0ed4324
      [  928.729455] RDX: 000000c421f0b918 RSI: 000000005000940f RDI: 0000000000000010
      [  928.729456] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  928.729457] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c421f0e000
      [  928.729458] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  928.729459] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  928.729487] ---[ end trace a43c996c7ae1c286 ]---
      [  929.082756] ------------[ cut here ]------------
      [  929.082792] WARNING: CPU: 2 PID: 17584 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  929.082793] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  929.082832] CPU: 2 PID: 17584 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  929.082833] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  929.082835] task: ffff9aa62a68c5c0 task.stack: ffffbce782bb0000
      [  929.082854] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  929.082855] RSP: 0018:ffffbce782bb3b80 EFLAGS: 00010206
      [  929.082857] RAX: ffff9aa488692230 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  929.082858] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa860380b40
      [  929.082859] RBP: ffffbce782bb3ba8 R08: 0000000000000001 R09: 0000000000000000
      [  929.082860] R10: 000000000000014b R11: 0000000000000133 R12: ffff9aa860380b40
      [  929.082861] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  929.082863] FS:  00007f95dc674ae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  929.082864] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  929.082865] CR2: 0000564b5a2b6ff0 CR3: 000000017a65a001 CR4: 00000000001606e0
      [  929.082876] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  929.082877] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  929.082878] Call Trace:
      [  929.082899]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  929.082916]  start_transaction+0x9b/0x440 [btrfs]
      [  929.082932]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  929.082950]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  929.082955]  ? wait_woken+0x80/0x80
      [  929.082974]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  929.082992]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  929.083010]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  929.083014]  ? __check_object_size+0xfc/0x1a0
      [  929.083018]  do_vfs_ioctl+0xa1/0x5f0
      [  929.083020]  ? do_vfs_ioctl+0xa1/0x5f0
      [  929.083022]  ? do_fcntl+0x449/0x580
      [  929.083024]  ? do_sys_open+0x1b4/0x280
      [  929.083026]  SyS_ioctl+0x79/0x90
      [  929.083030]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  929.083032] RIP: 0033:0x556de0ed4324
      [  929.083033] RSP: 002b:000000c421f0bfc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  929.083035] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  929.083036] RDX: 000000c4221aa000 RSI: 0000000050009417 RDI: 0000000000000011
      [  929.083037] RBP: 000000c421f0c120 R08: 0000000000000000 R09: 0000000000000000
      [  929.083038] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  929.083039] R13: 0000000000000020 R14: 00000000000000dd R15: 0000000000000047
      [  929.083040] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  929.083072] ---[ end trace a43c996c7ae1c287 ]---
      [  931.844086] ------------[ cut here ]------------
      [  931.844115] WARNING: CPU: 0 PID: 23097 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  931.844116] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  931.844156] CPU: 0 PID: 23097 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  931.844157] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  931.844158] task: ffff9aa520e29740 task.stack: ffffbce785970000
      [  931.844177] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  931.844178] RSP: 0018:ffffbce785973b80 EFLAGS: 00010202
      [  931.844179] RAX: ffff9aa48d894230 RBX: ffff9aa50b53e800 RCX: 0000000000000000
      [  931.844180] RDX: 0000000000000000 RSI: ffff9aa50b53e800 RDI: ffff9aa860206258
      [  931.844181] RBP: ffffbce785973ba8 R08: ffffdce77fc00cc0 R09: ffff9aa860206258
      [  931.844182] R10: 0000000000000000 R11: ffff9aa5981cc480 R12: ffff9aa860206258
      [  931.844182] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53e800
      [  931.844184] FS:  00007febb2e80ae8(0000) GS:ffff9aa87fc00000(0000) knlGS:0000000000000000
      [  931.844185] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  931.844186] CR2: 0000000000000000 CR3: 0000000023c4e005 CR4: 00000000001606f0
      [  931.844190] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  931.844191] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  931.844192] Call Trace:
      [  931.844211]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  931.844230]  start_transaction+0x9b/0x440 [btrfs]
      [  931.844248]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  931.844266]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  931.844273]  ? wait_woken+0x80/0x80
      [  931.844291]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  931.844308]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  931.844326]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  931.844329]  ? set_next_entity+0xd9/0x220
      [  931.844331]  ? pick_next_task_fair+0x443/0x560
      [  931.844334]  ? __switch_to+0x13f/0x530
      [  931.844337]  ? finish_task_switch+0x7b/0x200
      [  931.844341]  do_vfs_ioctl+0xa1/0x5f0
      [  931.844343]  ? do_vfs_ioctl+0xa1/0x5f0
      [  931.844346]  SyS_ioctl+0x79/0x90
      [  931.844350]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  931.844351] RIP: 0033:0x55fcab0b0324
      [  931.844352] RSP: 002b:000000c4223b5ed8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  931.844354] RAX: ffffffffffffffda RBX: 0000000000000100 RCX: 000055fcab0b0324
      [  931.844355] RDX: 000000c421412000 RSI: 0000000050009417 RDI: 0000000000000011
      [  931.844355] RBP: 00007febb2e80950 R08: 0000000000000000 R09: 0000000000000000
      [  931.844356] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  931.844357] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  931.844359] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  931.844395] ---[ end trace a43c996c7ae1c288 ]---
      [  932.619902] ------------[ cut here ]------------
      [  932.619931] WARNING: CPU: 2 PID: 18844 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  932.619932] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  932.619970] CPU: 2 PID: 18844 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  932.619971] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  932.619972] task: ffff9aa50cf38000 task.stack: ffffbce7833d8000
      [  932.619990] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  932.619991] RSP: 0018:ffffbce7833dbb80 EFLAGS: 00010283
      [  932.619993] RAX: ffff9aa50544d810 RBX: ffff9aa5bf0f6800 RCX: 0000000000000000
      [  932.619994] RDX: 0000000000000000 RSI: ffff9aa5bf0f6800 RDI: ffff9aa86024ea50
      [  932.619995] RBP: ffffbce7833dbba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024ea50
      [  932.619995] R10: 0000000000000000 R11: ffff9aa763433840 R12: ffff9aa86024ea50
      [  932.619996] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5bf0f6800
      [  932.619998] FS:  00007f5cd926aae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  932.619999] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  932.620000] CR2: 0000000000000000 CR3: 00000000b695a003 CR4: 00000000001606e0
      [  932.620004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  932.620005] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  932.620006] Call Trace:
      [  932.620025]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  932.620042]  start_transaction+0x9b/0x440 [btrfs]
      [  932.620057]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  932.620076]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  932.620082]  ? wait_woken+0x80/0x80
      [  932.620101]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  932.620127]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  932.620145]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  932.620149]  ? __check_object_size+0xfc/0x1a0
      [  932.620154]  do_vfs_ioctl+0xa1/0x5f0
      [  932.620156]  ? do_vfs_ioctl+0xa1/0x5f0
      [  932.620158]  ? do_fcntl+0x449/0x580
      [  932.620160]  ? do_sys_open+0x1b4/0x280
      [  932.620163]  SyS_ioctl+0x79/0x90
      [  932.620166]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  932.620168] RIP: 0033:0x56325a7da324
      [  932.620169] RSP: 002b:000000c42214ffc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  932.620171] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000056325a7da324
      [  932.620171] RDX: 000000c422444000 RSI: 0000000050009417 RDI: 0000000000000011
      [  932.620172] RBP: 000000c422150248 R08: 0000000000000000 R09: 0000000000000000
      [  932.620173] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  932.620174] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  932.620176] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  932.620204] ---[ end trace a43c996c7ae1c289 ]---
      [  933.320543] ------------[ cut here ]------------
      [  933.320575] WARNING: CPU: 2 PID: 23158 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  933.320576] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  933.320615] CPU: 2 PID: 23158 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  933.320616] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  933.320617] task: ffff9aa505c5c5c0 task.stack: ffffbce785528000
      [  933.320634] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  933.320635] RSP: 0018:ffffbce78552bb80 EFLAGS: 00010202
      [  933.320636] RAX: ffff9aa4fec72230 RBX: ffff9aa7506f7000 RCX: 0000000000000000
      [  933.320637] RDX: 0000000000000000 RSI: ffff9aa7506f7000 RDI: ffff9aa86024e528
      [  933.320638] RBP: ffffbce78552bba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024e528
      [  933.320638] R10: 0000000000000000 R11: ffff9aa7ca4e7a80 R12: ffff9aa86024e528
      [  933.320639] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa7506f7000
      [  933.320641] FS:  00007fdf3ba8aae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  933.320642] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  933.320643] CR2: 000000c420547000 CR3: 00000002682b6006 CR4: 00000000001606e0
      [  933.320647] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  933.320648] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  933.320649] Call Trace:
      [  933.320667]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  933.320683]  start_transaction+0x9b/0x440 [btrfs]
      [  933.320700]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  933.320718]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  933.320723]  ? wait_woken+0x80/0x80
      [  933.320741]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  933.320761]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  933.320778]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  933.320783]  ? __check_object_size+0xfc/0x1a0
      [  933.320786]  do_vfs_ioctl+0xa1/0x5f0
      [  933.320788]  ? do_vfs_ioctl+0xa1/0x5f0
      [  933.320790]  ? do_fcntl+0x449/0x580
      [  933.320792]  ? do_sys_open+0x1b4/0x280
      [  933.320794]  SyS_ioctl+0x79/0x90
      [  933.320798]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  933.320799] RIP: 0033:0x55a713a46324
      [  933.320800] RSP: 002b:000000c4224bdf78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  933.320802] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055a713a46324
      [  933.320803] RDX: 000000c4212d5000 RSI: 0000000050009417 RDI: 0000000000000011
      [  933.320804] RBP: 000000c4224be1f8 R08: 0000000000000000 R09: 0000000000000000
      [  933.320805] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  933.320806] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  933.320807] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  933.320836] ---[ end trace a43c996c7ae1c28a ]---
      [  933.959901] ------------[ cut here ]------------
      [  933.959940] WARNING: CPU: 2 PID: 17583 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  933.959941] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  933.959982] CPU: 2 PID: 17583 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  933.959983] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  933.959985] task: ffff9aa7d0100000 task.stack: ffffbce782b28000
      [  933.960003] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  933.960004] RSP: 0018:ffffbce782b2bb80 EFLAGS: 00010297
      [  933.960005] RAX: ffff9aa61d040348 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  933.960006] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa86024ebb8
      [  933.960007] RBP: ffffbce782b2bba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024ebb8
      [  933.960008] R10: 0000000000000000 R11: ffff9aa48cc883c0 R12: ffff9aa86024ebb8
      [  933.960009] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  933.960011] FS:  00007f95dc6e2ae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  933.960012] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  933.960013] CR2: 000000c4204c3000 CR3: 000000017a65a003 CR4: 00000000001606e0
      [  933.960017] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  933.960019] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  933.960019] Call Trace:
      [  933.960039]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  933.960057]  start_transaction+0x9b/0x440 [btrfs]
      [  933.960074]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  933.960093]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  933.960099]  ? wait_woken+0x80/0x80
      [  933.960117]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  933.960135]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  933.960152]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  933.960157]  ? __check_object_size+0xfc/0x1a0
      [  933.960162]  do_vfs_ioctl+0xa1/0x5f0
      [  933.960163]  ? do_vfs_ioctl+0xa1/0x5f0
      [  933.960165]  ? do_fcntl+0x449/0x580
      [  933.960168]  ? do_sys_open+0x1b4/0x280
      [  933.960170]  SyS_ioctl+0x79/0x90
      [  933.960174]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  933.960176] RIP: 0033:0x556de0ed4324
      [  933.960176] RSP: 002b:000000c421f0c288 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  933.960178] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  933.960180] RDX: 000000c4216b1000 RSI: 0000000050009417 RDI: 0000000000000011
      [  933.960180] RBP: 000000c421f0c468 R08: 0000000000000000 R09: 0000000000000000
      [  933.960181] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  933.960182] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  933.960184] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  933.960214] ---[ end trace a43c996c7ae1c28b ]---
      [  934.674630] ------------[ cut here ]------------
      [  934.674658] WARNING: CPU: 3 PID: 17630 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  934.674659] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  934.674700] CPU: 3 PID: 17630 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  934.674701] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  934.674702] task: ffff9aa610785d00 task.stack: ffffbce782f00000
      [  934.674719] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  934.674720] RSP: 0018:ffffbce782f03b80 EFLAGS: 00010206
      [  934.674722] RAX: ffff9aa50ace0460 RBX: ffff9aa4bdfa0800 RCX: 0000000000000000
      [  934.674723] RDX: 0000000000000000 RSI: ffff9aa4bdfa0800 RDI: ffff9aa8603459d8
      [  934.674724] RBP: ffffbce782f03ba8 R08: ffffdce77fd80cc0 R09: ffff9aa8603459d8
      [  934.674724] R10: 0000000000000000 R11: ffff9aa672215f00 R12: ffff9aa8603459d8
      [  934.674725] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4bdfa0800
      [  934.674727] FS:  00007f95dc0f8ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  934.674728] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  934.674729] CR2: 000000c420562038 CR3: 000000017a65a006 CR4: 00000000001606e0
      [  934.674733] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  934.674734] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  934.674735] Call Trace:
      [  934.674754]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  934.674769]  start_transaction+0x9b/0x440 [btrfs]
      [  934.674785]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  934.674803]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  934.674808]  ? wait_woken+0x80/0x80
      [  934.674825]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  934.674841]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  934.674857]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  934.674861]  ? __check_object_size+0xfc/0x1a0
      [  934.674864]  do_vfs_ioctl+0xa1/0x5f0
      [  934.674866]  ? do_vfs_ioctl+0xa1/0x5f0
      [  934.674868]  ? do_fcntl+0x449/0x580
      [  934.674870]  ? do_sys_open+0x1b4/0x280
      [  934.674872]  SyS_ioctl+0x79/0x90
      [  934.674878]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  934.674888] RIP: 0033:0x556de0ed4324
      [  934.674889] RSP: 002b:000000c421f0c290 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  934.674891] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000556de0ed4324
      [  934.674892] RDX: 000000c4204d7000 RSI: 0000000050009417 RDI: 0000000000000011
      [  934.674892] RBP: 00007f95dc0f88b0 R08: 0000000000000000 R09: 0000000000000000
      [  934.674893] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  934.674894] R13: 00000000000000ff R14: 00000000000000ff R15: 0000000000000000
      [  934.674896] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  934.674925] ---[ end trace a43c996c7ae1c28c ]---
      [  938.622382] ------------[ cut here ]------------
      [  938.622410] WARNING: CPU: 3 PID: 16589 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  938.622411] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  938.622452] CPU: 3 PID: 16589 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  938.622453] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  938.622454] task: ffff9aa4abb145c0 task.stack: ffffbce784e20000
      [  938.622472] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  938.622473] RSP: 0018:ffffbce784e23b80 EFLAGS: 00010216
      [  938.622475] RAX: ffff9aa5a4c1e118 RBX: ffff9aa50b53f800 RCX: 0000000000000000
      [  938.622476] RDX: 0000000000000000 RSI: ffff9aa50b53f800 RDI: ffff9aa860345258
      [  938.622477] RBP: ffffbce784e23ba8 R08: ffffdce77fd80cc0 R09: ffff9aa860345258
      [  938.622478] R10: 0000000000000000 R11: ffff9aa6c9a14c00 R12: ffff9aa860345258
      [  938.622479] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa50b53f800
      [  938.622481] FS:  00007f0bb6c47ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  938.622482] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  938.622483] CR2: 00007f704944f000 CR3: 000000006d90c004 CR4: 00000000001606e0
      [  938.622488] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  938.622489] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  938.622490] Call Trace:
      [  938.622509]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  938.622525]  start_transaction+0x9b/0x440 [btrfs]
      [  938.622542]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  938.622559]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  938.622564]  ? wait_woken+0x80/0x80
      [  938.622596]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  938.622613]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  938.622629]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  938.622633]  ? __check_object_size+0xfc/0x1a0
      [  938.622638]  do_vfs_ioctl+0xa1/0x5f0
      [  938.622639]  ? do_vfs_ioctl+0xa1/0x5f0
      [  938.622641]  ? do_fcntl+0x449/0x580
      [  938.622644]  ? do_sys_open+0x1b4/0x280
      [  938.622646]  SyS_ioctl+0x79/0x90
      [  938.622650]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  938.622652] RIP: 0033:0x55c987016324
      [  938.622653] RSP: 002b:000000c421296288 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  938.622654] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000055c987016324
      [  938.622655] RDX: 000000c421b6c000 RSI: 0000000050009417 RDI: 0000000000000011
      [  938.622656] RBP: 000000c421296468 R08: 0000000000000000 R09: 0000000000000000
      [  938.622657] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  938.622658] R13: 00000000000000f4 R14: 0000000000000074 R15: 0000000000000004
      [  938.622660] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  938.622691] ---[ end trace a43c996c7ae1c28d ]---
      [  940.419855] ------------[ cut here ]------------
      [  940.419890] WARNING: CPU: 1 PID: 18425 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  940.419891] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  940.419930] CPU: 1 PID: 18425 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  940.419931] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  940.419932] task: ffff9aa4ef472e80 task.stack: ffffbce784e70000
      [  940.419949] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  940.419950] RSP: 0018:ffffbce784e73b80 EFLAGS: 00010283
      [  940.419951] RAX: ffff9aa5a4c1e000 RBX: ffff9aa53a12e000 RCX: 0000000000000000
      [  940.419952] RDX: 0000000000000000 RSI: ffff9aa53a12e000 RDI: ffff9aa860380258
      [  940.419953] RBP: ffffbce784e73ba8 R08: ffffdce77fc80cc0 R09: ffff9aa860380258
      [  940.419954] R10: 0000000000000000 R11: ffff9aa515e10780 R12: ffff9aa860380258
      [  940.419955] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa53a12e000
      [  940.419957] FS:  00007f46a15fdae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  940.419958] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  940.419958] CR2: 00007f2f1c9ad000 CR3: 000000007f428003 CR4: 00000000001606e0
      [  940.419963] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  940.419964] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  940.419965] Call Trace:
      [  940.419988]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  940.420003]  start_transaction+0x9b/0x440 [btrfs]
      [  940.420018]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  940.420036]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  940.420041]  ? wait_woken+0x80/0x80
      [  940.420058]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  940.420073]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  940.420089]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  940.420092]  ? __check_object_size+0xfc/0x1a0
      [  940.420100]  do_vfs_ioctl+0xa1/0x5f0
      [  940.420101]  ? do_vfs_ioctl+0xa1/0x5f0
      [  940.420103]  ? do_fcntl+0x449/0x580
      [  940.420105]  ? do_sys_open+0x1b4/0x280
      [  940.420107]  SyS_ioctl+0x79/0x90
      [  940.420111]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  940.420112] RIP: 0033:0x56285c441324
      [  940.420113] RSP: 002b:000000c421f71fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  940.420115] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000056285c441324
      [  940.420116] RDX: 000000c42211a000 RSI: 0000000050009417 RDI: 0000000000000011
      [  940.420121] RBP: 000000c421f72248 R08: 0000000000000000 R09: 0000000000000000
      [  940.420122] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  940.420123] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  940.420124] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  940.420158] ---[ end trace a43c996c7ae1c28e ]---
      [  948.094996] ------------[ cut here ]------------
      [  948.095029] WARNING: CPU: 3 PID: 25494 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  948.095030] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  948.095071] CPU: 3 PID: 25494 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  948.095072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  948.095073] task: ffff9aa536e75d00 task.stack: ffffbce785978000
      [  948.095092] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  948.095093] RSP: 0018:ffffbce78597bc98 EFLAGS: 00010202
      [  948.095095] RAX: ffff9aa4db9f1b58 RBX: ffff9aa5392f9000 RCX: 0000000000000000
      [  948.095096] RDX: 0000000000000000 RSI: ffff9aa5392f9000 RDI: ffff9aa860345ac8
      [  948.095097] RBP: ffffbce78597bcc0 R08: 0000423f00001270 R09: 0000000000000000
      [  948.095098] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860345ac8
      [  948.095099] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa5faa13000
      [  948.095101] FS:  00007f5cd8cddae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  948.095102] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  948.095103] CR2: 00007f4f1bb0f000 CR3: 00000000b695a003 CR4: 00000000001606e0
      [  948.095107] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  948.095108] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  948.095108] Call Trace:
      [  948.095128]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  948.095147]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  948.095167]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  948.095173]  ? __check_object_size+0xfc/0x1a0
      [  948.095176]  ? dput+0xc7/0x1f0
      [  948.095179]  do_vfs_ioctl+0xa1/0x5f0
      [  948.095181]  ? do_vfs_ioctl+0xa1/0x5f0
      [  948.095184]  ? ____fput+0xe/0x10
      [  948.095186]  ? task_work_run+0x83/0xa0
      [  948.095189]  SyS_ioctl+0x79/0x90
      [  948.095193]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  948.095194] RIP: 0033:0x56325a7da324
      [  948.095195] RSP: 002b:000000c42214f8b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  948.095197] RAX: ffffffffffffffda RBX: 00007f5cd8cddae8 RCX: 000056325a7da324
      [  948.095198] RDX: 000000c42214f918 RSI: 000000005000940f RDI: 0000000000000010
      [  948.095199] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
      [  948.095200] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c422152000
      [  948.095201] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  948.095202] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  948.095235] ---[ end trace a43c996c7ae1c28f ]---
      [  978.093308] ------------[ cut here ]------------
      [  978.093343] WARNING: CPU: 3 PID: 21368 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  978.093344] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  978.093384] CPU: 3 PID: 21368 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  978.093385] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  978.093386] task: ffff9aa49c760000 task.stack: ffffbce7853c0000
      [  978.093404] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  978.093405] RSP: 0018:ffffbce7853c3c98 EFLAGS: 00010206
      [  978.093407] RAX: ffff9aa66f961180 RBX: ffff9aa5e30a7800 RCX: 0000000000000000
      [  978.093408] RDX: 0000000000000000 RSI: ffff9aa5e30a7800 RDI: ffff9aa860345618
      [  978.093409] RBP: ffffbce7853c3cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  978.093409] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860345618
      [  978.093410] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4c1228000
      [  978.093412] FS:  00007fcad3392ae8(0000) GS:ffff9aa87fd80000(0000) knlGS:0000000000000000
      [  978.093413] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  978.093414] CR2: 00007fcad2e58cf0 CR3: 0000000047b6a002 CR4: 00000000001606e0
      [  978.093418] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  978.093419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  978.093420] Call Trace:
      [  978.093440]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  978.093459]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  978.093478]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  978.093482]  ? set_next_entity+0xd9/0x220
      [  978.093484]  ? pick_next_task_fair+0x443/0x560
      [  978.093488]  ? __switch_to+0x13f/0x530
      [  978.093492]  do_vfs_ioctl+0xa1/0x5f0
      [  978.093497]  ? __schedule+0x3ca/0x890
      [  978.093499]  ? do_vfs_ioctl+0xa1/0x5f0
      [  978.093501]  SyS_ioctl+0x79/0x90
      [  978.093503]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  978.093505] RIP: 0033:0x56520d418324
      [  978.093506] RSP: 002b:000000c4223558b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  978.093508] RAX: ffffffffffffffda RBX: 00007fcad3392a00 RCX: 000056520d418324
      [  978.093509] RDX: 000000c422355918 RSI: 000000005000940f RDI: 0000000000000010
      [  978.093510] RBP: 00007fcad3392980 R08: 0000000000000000 R09: 0000000000000000
      [  978.093510] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  978.093511] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  978.093513] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  978.093545] ---[ end trace a43c996c7ae1c290 ]---
      [  979.880952] ------------[ cut here ]------------
      [  979.880991] WARNING: CPU: 1 PID: 20907 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  979.880992] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  979.881033] CPU: 1 PID: 20907 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  979.881034] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  979.881035] task: ffff9aa52fc3dd00 task.stack: ffffbce785460000
      [  979.881054] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  979.881055] RSP: 0018:ffffbce785463c98 EFLAGS: 00010202
      [  979.881057] RAX: ffff9aa515eadd88 RBX: ffff9aa6caa1e000 RCX: 0000000000000000
      [  979.881057] RDX: 0000000000000000 RSI: ffff9aa6caa1e000 RDI: ffff9aa860380780
      [  979.881058] RBP: ffffbce785463cc0 R08: 0000423f00001270 R09: 0000000000000000
      [  979.881059] R10: 0000000000000000 R11: 0000000000000000 R12: ffff9aa860380780
      [  979.881060] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa4f31a4000
      [  979.881062] FS:  00007f444f080ae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  979.881063] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  979.881064] CR2: 000000c4200ab000 CR3: 000000003cfc6005 CR4: 00000000001606e0
      [  979.881068] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  979.881069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  979.881070] Call Trace:
      [  979.881094]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  979.881113]  btrfs_ioctl_snap_destroy+0x4b9/0x7f0 [btrfs]
      [  979.881132]  btrfs_ioctl+0x26b/0x1ea0 [btrfs]
      [  979.881136]  ? set_next_entity+0xd9/0x220
      [  979.881138]  ? pick_next_task_fair+0x443/0x560
      [  979.881141]  ? __switch_to+0x13f/0x530
      [  979.881147]  do_vfs_ioctl+0xa1/0x5f0
      [  979.881151]  ? __schedule+0x3ca/0x890
      [  979.881154]  ? do_vfs_ioctl+0xa1/0x5f0
      [  979.881156]  SyS_ioctl+0x79/0x90
      [  979.881160]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  979.881161] RIP: 0033:0x56204f224324
      [  979.881162] RSP: 002b:000000c42243f8b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  979.881164] RAX: ffffffffffffffda RBX: 00007f444f080a00 RCX: 000056204f224324
      [  979.881165] RDX: 000000c42243f918 RSI: 000000005000940f RDI: 0000000000000010
      [  979.881166] RBP: 00007f444f080980 R08: 0000000000000000 R09: 0000000000000000
      [  979.881167] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  979.881168] R13: 0000000000000018 R14: 0000000000000011 R15: 0000000000000018
      [  979.881170] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  979.881203] ---[ end trace a43c996c7ae1c291 ]---
      [  980.366355] ------------[ cut here ]------------
      [  980.366397] WARNING: CPU: 2 PID: 20907 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  980.366398] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  980.366446] CPU: 2 PID: 20907 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  980.366447] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  980.366449] task: ffff9aa52fc3dd00 task.stack: ffffbce785460000
      [  980.366466] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  980.366467] RSP: 0018:ffffbce785463b80 EFLAGS: 00010283
      [  980.366468] RAX: ffff9aa6b6a31810 RBX: ffff9aa48815a800 RCX: 0000000000000000
      [  980.366469] RDX: 0000000000000000 RSI: ffff9aa48815a800 RDI: ffff9aa86024e780
      [  980.366470] RBP: ffffbce785463ba8 R08: ffffdce77fd00cc0 R09: ffff9aa86024e780
      [  980.366471] R10: 0000000000000000 R11: ffff9aa5a9fe2240 R12: ffff9aa86024e780
      [  980.366472] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa48815a800
      [  980.366474] FS:  00007f444f080ae8(0000) GS:ffff9aa87fd00000(0000) knlGS:0000000000000000
      [  980.366475] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  980.366476] CR2: 000055bb886cdff0 CR3: 000000003cfc6002 CR4: 00000000001606e0
      [  980.366480] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  980.366481] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  980.366482] Call Trace:
      [  980.366502]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  980.366520]  start_transaction+0x9b/0x440 [btrfs]
      [  980.366536]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  980.366554]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  980.366559]  ? wait_woken+0x80/0x80
      [  980.366576]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  980.366595]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  980.366612]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  980.366616]  ? __check_object_size+0xfc/0x1a0
      [  980.366619]  do_vfs_ioctl+0xa1/0x5f0
      [  980.366621]  ? do_vfs_ioctl+0xa1/0x5f0
      [  980.366623]  ? do_fcntl+0x449/0x580
      [  980.366625]  ? do_sys_open+0x1b4/0x280
      [  980.366628]  SyS_ioctl+0x79/0x90
      [  980.366631]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  980.366632] RIP: 0033:0x56204f224324
      [  980.366633] RSP: 002b:000000c42243ff78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  980.366635] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000056204f224324
      [  980.366636] RDX: 000000c421200000 RSI: 0000000050009417 RDI: 0000000000000011
      [  980.366637] RBP: 000000c4224401f8 R08: 0000000000000000 R09: 0000000000000000
      [  980.366638] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  980.366639] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  980.366640] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  980.366673] ---[ end trace a43c996c7ae1c292 ]---
      [  980.943590] ------------[ cut here ]------------
      [  980.943621] WARNING: CPU: 1 PID: 21464 at /build/linux-gcp-V5Dzwm/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
      [  980.943622] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev parport_pc input_leds parport serio_raw pvpanic ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
      [  980.943659] CPU: 1 PID: 21464 Comm: dockerd Tainted: G        W       4.13.0-1006-gcp #9-Ubuntu
      [  980.943660] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
      [  980.943662] task: ffff9aa48c20dd00 task.stack: ffffbce785828000
      [  980.943679] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
      [  980.943680] RSP: 0018:ffffbce78582bb80 EFLAGS: 00010212
      [  980.943681] RAX: ffff9aa53af56c08 RBX: ffff9aa6caa19000 RCX: 0000000000000000
      [  980.943682] RDX: 0000000000000000 RSI: ffff9aa6caa19000 RDI: ffff9aa860380f78
      [  980.943683] RBP: ffffbce78582bba8 R08: ffffdce77fc80cc0 R09: ffff9aa860380f78
      [  980.943684] R10: 0000000000000000 R11: ffff9aa5a7268b40 R12: ffff9aa860380f78
      [  980.943684] R13: ffff9aa86a7ec8f8 R14: ffff9aa86a7e0000 R15: ffff9aa6caa19000
      [  980.943686] FS:  00007fcad3238ae8(0000) GS:ffff9aa87fc80000(0000) knlGS:0000000000000000
      [  980.943687] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  980.943688] CR2: 00007f738f710000 CR3: 0000000047b6a001 CR4: 00000000001606e0
      [  980.943692] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
      [  980.943693] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
      [  980.943694] Call Trace:
      [  980.943712]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
      [  980.943729]  start_transaction+0x9b/0x440 [btrfs]
      [  980.943744]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [  980.943761]  btrfs_mksubvol+0x420/0x570 [btrfs]
      [  980.943766]  ? wait_woken+0x80/0x80
      [  980.943784]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
      [  980.943800]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
      [  980.943818]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
      [  980.943827]  ? __check_object_size+0xfc/0x1a0
      [  980.943832]  do_vfs_ioctl+0xa1/0x5f0
      [  980.943834]  ? do_vfs_ioctl+0xa1/0x5f0
      [  980.943835]  ? do_fcntl+0x449/0x580
      [  980.943838]  ? do_sys_open+0x1b4/0x280
      [  980.943840]  SyS_ioctl+0x79/0x90
      [  980.943843]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [  980.943844] RIP: 0033:0x56520d418324
      [  980.943845] RSP: 002b:000000c4223562e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
      [  980.943847] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000056520d418324
      [  980.943848] RDX: 000000c42005b000 RSI: 0000000050009417 RDI: 0000000000000011
      [  980.943849] RBP: 000000c422356518 R08: 0000000000000000 R09: 0000000000000000
      [  980.943850] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [  980.943851] R13: 00000000000000f9 R14: 0000000000000011 R15: 0000000000000108
      [  980.943852] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
      [  980.943880] ---[ end trace a43c996c7ae1c293 ]---
      [ 1209.329283] Call Trace:
      [ 1209.329292]  __schedule+0x3c2/0x890
      [ 1209.329316]  ? free_root_pointers+0x70/0x70 [btrfs]
      [ 1209.329321]  schedule+0x36/0x80
      [ 1209.329336]  btrfs_tree_read_lock+0xcc/0x120 [btrfs]
      [ 1209.329340]  ? wait_woken+0x80/0x80
      [ 1209.329354]  __add_missing_keys+0xbe/0x130 [btrfs]
      [ 1209.329368]  ? free_extent_buffer+0x4b/0xa0 [btrfs]
      [ 1209.329383]  find_parent_nodes+0x358/0x8e0 [btrfs]
      [ 1209.329397]  __btrfs_find_all_roots+0xa9/0x120 [btrfs]
      [ 1209.329411]  btrfs_find_all_roots+0x55/0x70 [btrfs]
      [ 1209.329425]  btrfs_qgroup_trace_extent+0x126/0x150 [btrfs]
      [ 1209.329438]  btrfs_qgroup_trace_leaf_items+0x118/0x150 [btrfs]
      [ 1209.329451]  btrfs_qgroup_trace_subtree+0x1c3/0x350 [btrfs]
      [ 1209.329470]  ? mark_extent_buffer_accessed+0x59/0x80 [btrfs]
      [ 1209.329481]  do_walk_down+0x2f7/0x590 [btrfs]
      [ 1209.329492]  ? walk_down_proc+0x2d1/0x2f0 [btrfs]
      [ 1209.329503]  walk_down_tree+0xbd/0x100 [btrfs]
      [ 1209.329515]  btrfs_drop_snapshot+0x3e9/0x870 [btrfs]
      [ 1209.329527]  btrfs_clean_one_deleted_snapshot+0xb7/0x100 [btrfs]
      [ 1209.329539]  cleaner_kthread+0x13a/0x190 [btrfs]
      [ 1209.329542]  kthread+0x109/0x140
      [ 1209.329554]  ? run_one_async_done+0xb0/0xb0 [btrfs]
      [ 1209.329555]  ? kthread_create_on_node+0x70/0x70
      [ 1209.329557]  ret_from_fork+0x1f/0x30
      [ 1209.353882] Call Trace:
      [ 1209.353889]  __schedule+0x3c2/0x890
      [ 1209.353892]  ? lock_timer_base+0x7d/0xa0
      [ 1209.353893]  schedule+0x36/0x80
      [ 1209.353916]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.353920]  ? wait_woken+0x80/0x80
      [ 1209.353933]  start_transaction+0x220/0x440 [btrfs]
      [ 1209.353945]  btrfs_attach_transaction+0x1d/0x20 [btrfs]
      [ 1209.353956]  transaction_kthread+0x8c/0x1c0 [btrfs]
      [ 1209.353958]  kthread+0x109/0x140
      [ 1209.353969]  ? btrfs_cleanup_transaction+0x540/0x540 [btrfs]
      [ 1209.353970]  ? kthread_create_on_node+0x70/0x70
      [ 1209.353972]  ret_from_fork+0x1f/0x30
      [ 1209.378139] Call Trace:
      [ 1209.378143]  __schedule+0x3c2/0x890
      [ 1209.378161]  ? ulist_add_merge+0xae/0x140 [btrfs]
      [ 1209.378165]  schedule+0x36/0x80
      [ 1209.378178]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.378180]  ? wait_woken+0x80/0x80
      [ 1209.378191]  start_transaction+0x2ad/0x440 [btrfs]
      [ 1209.378203]  btrfs_start_transaction_fallback_global_rsv+0x37/0x130 [btrfs]
      [ 1209.378214]  btrfs_unlink+0x35/0xd0 [btrfs]
      [ 1209.378217]  vfs_unlink+0xf1/0x1a0
      [ 1209.378220]  ? apparmor_path_unlink+0x1b/0x20
      [ 1209.378221]  do_unlinkat+0x27f/0x2e0
      [ 1209.378223]  SyS_unlinkat+0x1b/0x30
      [ 1209.378224]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.378226] RIP: 0033:0x494924
      [ 1209.378226] RSP: 002b:000000c423e595c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
      [ 1209.378228] RAX: ffffffffffffffda RBX: 0000000000000700 RCX: 0000000000494924
      [ 1209.378228] RDX: 0000000000000000 RSI: 000000c42242c0f0 RDI: ffffffffffffff9c
      [ 1209.378229] RBP: 000000c423e59648 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.378230] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [ 1209.378230] R13: 0000000000000028 R14: 0000000000000011 R15: 0000000000000004
      [ 1209.400826] Call Trace:
      [ 1209.400831]  __schedule+0x3c2/0x890
      [ 1209.400847]  ? ulist_add_merge+0xae/0x140 [btrfs]
      [ 1209.400850]  schedule+0x36/0x80
      [ 1209.400862]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.400866]  ? wait_woken+0x80/0x80
      [ 1209.400876]  start_transaction+0x2ad/0x440 [btrfs]
      [ 1209.400886]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [ 1209.400899]  btrfs_mkdir+0x65/0x200 [btrfs]
      [ 1209.400901]  vfs_mkdir+0x10c/0x1b0
      [ 1209.400903]  SyS_mkdirat+0xcf/0x100
      [ 1209.400904]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.400906] RIP: 0033:0x494924
      [ 1209.400907] RSP: 002b:000000c4212eab88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
      [ 1209.400908] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000494924
      [ 1209.400909] RDX: 00000000000001c0 RSI: 000000c422704a10 RDI: ffffffffffffff9c
      [ 1209.400909] RBP: 000000c4212ea348 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.400910] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000488c73
      [ 1209.400910] R13: 00000000000000ff R14: 00000000000000ff R15: 0000000000000000
      [ 1209.424896] Call Trace:
      [ 1209.424900]  __schedule+0x3c2/0x890
      [ 1209.424903]  ? path_parentat+0x3c/0x80
      [ 1209.424906]  schedule+0x36/0x80
      [ 1209.424907]  rwsem_down_write_failed+0x237/0x3b0
      [ 1209.424909]  call_rwsem_down_write_failed+0x17/0x30
      [ 1209.424910]  ? call_rwsem_down_write_failed+0x17/0x30
      [ 1209.424911]  down_write+0x2d/0x40
      [ 1209.424912]  filename_create+0x7a/0x160
      [ 1209.424914]  SyS_mkdirat+0x54/0x100
      [ 1209.424915]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.424916] RIP: 0033:0x494924
      [ 1209.424921] RSP: 002b:000000c422183828 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
      [ 1209.424922] RAX: ffffffffffffffda RBX: 0000000000001000 RCX: 0000000000494924
      [ 1209.424923] RDX: 00000000000001ed RSI: 000000c4237f24b0 RDI: ffffffffffffff9c
      [ 1209.424924] RBP: 00007f39d37fddc8 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.424924] R10: 0000000000000000 R11: 0000000000000246 R12: 000000c422616038
      [ 1209.424925] R13: 00000000000000f1 R14: 0000000000000011 R15: 000000c4207c5560
      [ 1209.449021] Call Trace:
      [ 1209.449026]  __schedule+0x3c2/0x890
      [ 1209.449030]  ? path_parentat+0x3c/0x80
      [ 1209.449034]  schedule+0x36/0x80
      [ 1209.449035]  rwsem_down_write_failed+0x237/0x3b0
      [ 1209.449037]  call_rwsem_down_write_failed+0x17/0x30
      [ 1209.449038]  ? call_rwsem_down_write_failed+0x17/0x30
      [ 1209.449039]  down_write+0x2d/0x40
      [ 1209.449041]  filename_create+0x7a/0x160
      [ 1209.449042]  SyS_mkdirat+0x54/0x100
      [ 1209.449044]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.449045] RIP: 0033:0x494924
      [ 1209.449046] RSP: 002b:000000c421599828 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
      [ 1209.449047] RAX: ffffffffffffffda RBX: 0000000000000120 RCX: 0000000000494924
      [ 1209.449048] RDX: 00000000000001ed RSI: 000000c423a8e820 RDI: ffffffffffffff9c
      [ 1209.449054] RBP: 000000c421599928 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.449056] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
      [ 1209.449056] R13: 000000c422b82b88 R14: 0000000000000010 R15: 000000c422b82b40
      [ 1209.471742] Call Trace:
      [ 1209.471746]  __schedule+0x3c2/0x890
      [ 1209.471772]  ? ulist_add_merge+0xae/0x140 [btrfs]
      [ 1209.471776]  schedule+0x36/0x80
      [ 1209.471788]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.471790]  ? wait_woken+0x80/0x80
      [ 1209.471803]  start_transaction+0x2ad/0x440 [btrfs]
      [ 1209.471813]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [ 1209.471824]  btrfs_mkdir+0x65/0x200 [btrfs]
      [ 1209.471826]  vfs_mkdir+0x10c/0x1b0
      [ 1209.471828]  SyS_mkdirat+0xcf/0x100
      [ 1209.471829]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.471830] RIP: 0033:0x494924
      [ 1209.471831] RSP: 002b:000000c42217f828 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
      [ 1209.471832] RAX: ffffffffffffffda RBX: 0000000000000120 RCX: 0000000000494924
      [ 1209.471832] RDX: 00000000000001ed RSI: 000000c423b2ba40 RDI: ffffffffffffff9c
      [ 1209.471834] RBP: 000000c42217fa08 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.471835] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [ 1209.471835] R13: 00000000000000fb R14: 00000000000000fb R15: 000000c423e6d9e0
      [ 1209.494472] Call Trace:
      [ 1209.494476]  __schedule+0x3c2/0x890
      [ 1209.494511]  ? ulist_add_merge+0xae/0x140 [btrfs]
      [ 1209.494514]  schedule+0x36/0x80
      [ 1209.494526]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.494530]  ? wait_woken+0x80/0x80
      [ 1209.494541]  start_transaction+0x2ad/0x440 [btrfs]
      [ 1209.494554]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [ 1209.494569]  btrfs_rename+0x194/0xcd0 [btrfs]
      [ 1209.494580]  btrfs_rename2+0x1d/0x30 [btrfs]
      [ 1209.494585]  vfs_rename+0x69c/0x8b0
      [ 1209.494587]  SyS_renameat+0x3c3/0x3f0
      [ 1209.494589]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.494590] RIP: 0033:0x49499a
      [ 1209.494591] RSP: 002b:000000c423e077f8 EFLAGS: 00000216 ORIG_RAX: 0000000000000108
      [ 1209.494592] RAX: ffffffffffffffda RBX: 0000000000001000 RCX: 000000000049499a
      [ 1209.494592] RDX: ffffffffffffff9c RSI: 000000c42242c280 RDI: ffffffffffffff9c
      [ 1209.494593] RBP: 00007f39a0ff8dc8 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.494594] R10: 000000c42242c2d0 R11: 0000000000000216 R12: 0000000000000000
      [ 1209.494594] R13: 00000000000000f7 R14: 0000000000000077 R15: 000000c423610580
      [ 1209.518663] Call Trace:
      [ 1209.518668]  __schedule+0x3c2/0x890
      [ 1209.518690]  ? ulist_add_merge+0xae/0x140 [btrfs]
      [ 1209.518694]  schedule+0x36/0x80
      [ 1209.518707]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.518710]  ? wait_woken+0x80/0x80
      [ 1209.518723]  start_transaction+0x2ad/0x440 [btrfs]
      [ 1209.518735]  btrfs_start_transaction_fallback_global_rsv+0x37/0x130 [btrfs]
      [ 1209.518748]  btrfs_unlink+0x35/0xd0 [btrfs]
      [ 1209.518750]  vfs_unlink+0xf1/0x1a0
      [ 1209.518752]  ? apparmor_path_unlink+0x1b/0x20
      [ 1209.518754]  do_unlinkat+0x27f/0x2e0
      [ 1209.518756]  SyS_unlinkat+0x1b/0x30
      [ 1209.518758]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.518759] RIP: 0033:0x494924
      [ 1209.518760] RSP: 002b:000000c4221815c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
      [ 1209.518761] RAX: ffffffffffffffda RBX: 0000000000001000 RCX: 0000000000494924
      [ 1209.518761] RDX: 0000000000000000 RSI: 000000c423564c80 RDI: ffffffffffffff9c
      [ 1209.518762] RBP: 000000c422181648 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.518763] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
      [ 1209.518763] R13: 0000000000000028 R14: 0000000000000011 R15: 0000000000000001
      [ 1209.541460] Call Trace:
      [ 1209.541465]  __schedule+0x3c2/0x890
      [ 1209.541488]  ? ulist_add_merge+0xae/0x140 [btrfs]
      [ 1209.541490]  schedule+0x36/0x80
      [ 1209.541506]  wait_current_trans+0xc2/0x100 [btrfs]
      [ 1209.541511]  ? wait_woken+0x80/0x80
      [ 1209.541523]  start_transaction+0x2ad/0x440 [btrfs]
      [ 1209.541536]  btrfs_start_transaction+0x1e/0x20 [btrfs]
      [ 1209.541552]  btrfs_mkdir+0x65/0x200 [btrfs]
      [ 1209.541555]  vfs_mkdir+0x10c/0x1b0
      [ 1209.541556]  SyS_mkdirat+0xcf/0x100
      [ 1209.541558]  entry_SYSCALL_64_fastpath+0x1e/0x81
      [ 1209.541559] RIP: 0033:0x494924
      [ 1209.541560] RSP: 002b:000000c421452b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
      [ 1209.541561] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000494924
      [ 1209.541562] RDX: 00000000000001c0 RSI: 000000c422704770 RDI: ffffffffffffff9c
      [ 1209.541562] RBP: 000000c421452348 R08: 0000000000000000 R09: 0000000000000000
      [ 1209.541563] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000488c73
      [ 1209.541564] R13: 00000000000000ff R14: 00000000000000ff R15: 0000000000000000
    
    

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vito commented Jan 22, 2018

I'm going to re-do some of the exercises from #1045 on btrfs with and without quotas enabled. I have a hunch that things may be a lot more stable/performant without it. We only enabled quotas for volume size reporting, a long long time ago, and don't even do that anymore.

@topherbullock topherbullock added this to In Flight in Runtime Jan 22, 2018

vito added a commit to concourse/baggageclaim that referenced this issue Jan 22, 2018

don't use btrfs quotas for size tracking
this likely has significant performance and stability impact, and we
don't even use size reporting anymore

concourse/concourse#1966

vito added a commit that referenced this issue Jan 22, 2018

bump baggageclaim
#1966

Submodule src/github.com/concourse/baggageclaim d148145..e0cf556:
  > don't use btrfs quotas for size tracking
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vito commented Jan 23, 2018

Couldn't get btrfs to lock up on latest stemcell, but then rolled back to 3363.20 and it happened within an hour.

Here are the kernel versions:

# worked
Linux b7013c9a-b95f-4398-a617-f1b887ad9aef 4.4.0-109-generic #132~14.04.1-Ubuntu SMP Tue Jan 9 21:46:42 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

# locked up
Linux 5cf5ded6-e38e-4e8b-8a71-52b4d904307c 4.4.0-75-generic #96~14.04.1-Ubuntu SMP Thu Apr 20 11:06:30 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Once it locked up the worker stalled and dropped out of the pool.

So there's a chance the instability has been fixed in the kernel. There's also a reasonable chance that I just got lucky/unlucky and the stability issues are still present. This isn't exactly a scientific process.

In any case, I'm going to re-create the worker and see if I can get this to happen a few more times. After I can do that, I'm going to rip out the quota usage and see if the issue is resolved by that.

Here's the /var/log/kern.log trace: https://gist.github.com/vito/e18f57d6c7772c9dcf3489c03163b68e - note that there's no mention of quota stuff in the stack trace.

Edit: rather than immediately ripping out quota usage I've opted to repeat the test and ensure I've got a reliable repro. It happened again on the second try, here's the stack: https://gist.github.com/vito/c2d365110b2dc7e3a645647840ace300

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vito commented Jan 23, 2018

@avanier @fkoclas If your btrfs stability issues are pretty easy to reproduce, could you try out 3.8.1-rc.62 which rips out the quota usage from BaggageClaim?

I would recommend deploying it as a separate worker if possible, i.e. not upgrading the web nodes if it can be avoided.

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fkoclas commented Jan 24, 2018

Now using 4.13.0-1007-gcp #10-Ubuntu SMP Fri Jan 12 13:56:47 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux, as part of the latest Ubuntu LTS gcp image Canonical | ubuntu-1604-lts | Jan 23, 2018, 4:24:01 AM

The issue is indeed reproducible, however it seems the behavior has changed with this slightly newer kernel.

Got the classic errors, i.e.

[ 1000.036332] WARNING: CPU: 2 PID: 11948 at /build/linux-gcp-JapeBw/linux-gcp-4.13.0/fs/btrfs/transaction.c:322 record_root_in_trans+0xdf/0xf0 [btrfs]
[ 1000.036333] Modules linked in: xfrm_user xfrm_algo xt_addrtype nf_log_ipv4 nf_log_common xt_LOG ipt_MASQUERADE nf_nat_masquerade_ipv4 xt_comment veth bridge stp llc iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack aufs ip6table_filter ip6_tables iptable_filter ip_tables x_tables ppdev input_leds serio_raw pvpanic parport_pc parport ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc aesni_intel aes_x86_64 crypto_simd glue_helper cryptd psmouse nvme virtio_net nvme_core
[ 1000.036374] CPU: 2 PID: 11948 Comm: btrfs Tainted: G        W       4.13.0-1007-gcp #10-Ubuntu
[ 1000.036375] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 1000.036376] task: ffff958584ac9740 task.stack: ffffb80103b10000
[ 1000.036401] RIP: 0010:record_root_in_trans+0xdf/0xf0 [btrfs]
[ 1000.036402] RSP: 0018:ffffb80103b13b80 EFLAGS: 00010202
[ 1000.036404] RAX: ffff9585cc9b6460 RBX: ffff958837f13000 RCX: 0000000000000000
[ 1000.036405] RDX: 0000000000000000 RSI: ffff958837f13000 RDI: ffff958960415d98
[ 1000.036406] RBP: ffffb80103b13ba8 R08: ffffd800ffd00880 R09: ffff958960415d98
[ 1000.036406] R10: 0000000000000000 R11: ffff95891f9d3d80 R12: ffff958960415d98
[ 1000.036407] R13: ffff95896c36c8f8 R14: ffff95896c360000 R15: ffff958837f13000
[ 1000.036409] FS:  00000000019d2a00(0000) GS:ffff95897fd00000(0000) knlGS:0000000000000000
[ 1000.036410] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1000.036411] CR2: 00000000019e5eb8 CR3: 00000001ec212003 CR4: 00000000001606e0
[ 1000.036415] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1000.036415] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1000.036416] Call Trace:
[ 1000.036436]  btrfs_record_root_in_trans+0x4b/0x70 [btrfs]
[ 1000.036453]  start_transaction+0x9b/0x440 [btrfs]
[ 1000.036469]  btrfs_start_transaction+0x1e/0x20 [btrfs]
[ 1000.036488]  btrfs_mksubvol+0x420/0x570 [btrfs]
[ 1000.036493]  ? wait_woken+0x80/0x80
[ 1000.036511]  btrfs_ioctl_snap_create_transid+0x185/0x190 [btrfs]
[ 1000.036527]  btrfs_ioctl_snap_create_v2+0x123/0x170 [btrfs]
[ 1000.036543]  btrfs_ioctl+0x5ed/0x1ea0 [btrfs]
[ 1000.036547]  ? lru_cache_add_active_or_unevictable+0x36/0xb0
[ 1000.036550]  ? __handle_mm_fault+0xdaa/0x1070
[ 1000.036555]  do_vfs_ioctl+0xa1/0x5f0
[ 1000.036556]  ? do_vfs_ioctl+0xa1/0x5f0
[ 1000.036560]  ? __do_page_fault+0x283/0x4f0
[ 1000.036562]  SyS_ioctl+0x79/0x90
[ 1000.036566]  entry_SYSCALL_64_fastpath+0x33/0xa3
[ 1000.036567] RIP: 0033:0x4f4677
[ 1000.036568] RSP: 002b:00007ffd7681a3b8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[ 1000.036569] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004f4677
[ 1000.036570] RDX: 00007ffd7681a400 RSI: 0000000050009417 RDI: 0000000000000003
[ 1000.036571] RBP: 00000000019d4d70 R08: 0000000000000000 R09: 00000000000000ae
[ 1000.036572] R10: 000000000000000f R11: 0000000000000202 R12: 0000000000000000
[ 1000.036573] R13: 00007ffd7681bea7 R14: 00007ffd7681a400 R15: 0000000000000004
[ 1000.036575] Code: 1f 40 00 49 8b 04 24 48 89 de 4c 89 e7 48 89 83 40 03 00 00 e8 a3 bd 05 00 f0 80 63 20 fe 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> ff e9 5e ff ff ff 0f ff e9 4a ff ff ff 0f 1f 00 0f 1f 44 00 
[ 1000.036603] ---[ end trace 1c876c373050af49 ]---

And then... the VM itself ended up crashing (rebooted itself, this is a first for us), leaving this interesting tidbit in dmesg:

[   32.190085] BTRFS error (device nvme0n1p1): parent transid verify failed on 374898688 wanted 1342 found 1343
[   33.110051] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   33.822814] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   33.883924] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   33.998394] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   34.290912] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   34.602414] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   34.626007] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   34.650638] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   34.676967] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   37.855535] verify_parent_transid: 4 callbacks suppressed
[   37.855538] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   37.865470] BTRFS error (device nvme0n1p1): Error -5 accounting shared subtree. Quota is out of sync, rescan required.
[   37.905667] BTRFS error (device nvme0n1p1): parent transid verify failed on 711409664 wanted 1507 found 1510
[   37.916846] BTRFS: error (device nvme0n1p1) in btrfs_drop_snapshot:9244: errno=-5 IO failure
[   37.926769] BTRFS info (device nvme0n1p1): forced readonly
[  208.268140] BTRFS error (device nvme0n1p1): cleaner transaction attach returned -30
[  225.862109] BTRFS: device fsid b99d50b9-3c28-420d-8db2-16be3eb67922 devid 1 transid 3 /dev/nvme0n1p1

I will try 3.8.1-rc.62 and report back.

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vito commented Jan 24, 2018

@fkoclas Great to hear! I had given up on trying to reproduce this on my own; I started to suspect that the traces I saw were only slowdowns and nothing really interesting/ (well, unless disabling quotas helps that too), but your second snippet there definitely looks suspect, especially the 'forced readonly' bit - that's something we had observed in the past.

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fkoclas commented Jan 24, 2018

@vito I am happy to report that we haven't experienced any crashes with 3.8.1rc62! We never got it running this long with nothing to report in dmesg -k -l warn. Normally we could get a crash in a few minutes, now it's been running for hours (2 workers, just added a bunch of others and no crashes whatsoever yet) :)

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vito commented Jan 24, 2018

@fkoclas I'm going to hold off busting out the champagne for now, but that's great news!

I wonder if it's also faster in any way with quotas disabled.

In the long term, assuming it does prove stable for an extended period, it may be worth considering a move back to btrfs as the default. The path forward for making overlay just as fast for privileged containers is fairly hopeful, basically relying on shiftfs eventually making it in (and being widespread enough to expect and use) or being able to run everything unprivileged (I don't see that happening soon either). Sucks being on the bleeding edge of container tech sometimes.

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avanier commented Jan 24, 2018

@vito It's to be noted our current setup is also running on a natively formatted btrfs filesystem. We should also run a run of tests with btrfs loopbacked over xfs... but yeah, it's looking not too bad so far. :D

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drahnr commented Jan 25, 2018

@fkoclas I had plenty of those too, filed a couple of tickets against fedora but so far nothing happened
@avanier it starts out all nice, but if you run the bare docker container and kill it (or: systemd kills it) you will end up with a wacked fs (given: host btrfs, storage driver btrfs) see https://bugzilla.redhat.com/show_bug.cgi?id=1474503

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avanier commented Jan 25, 2018

@drahnr I'm not sure I follow you. We're running full VM instances with a binary install, not containers.

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vito commented Jan 25, 2018

@drahnr The logs in that bug report indicate that that may also be helped by the removal of quotas.

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drahnr commented Jan 25, 2018

@vito the bad news is, I did not set any quota, thera is a whole disk formatted btrfs exclusively for concourse workdir
@avanier I am running full VM instances with binary now, I used to run docker container instead in that VM but that seemed to be even more fragile, killing either caused various corruptions on the btrfs volume or froze the whole machine with dmesg showing btrfs kernel space BUG_ON

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vito commented Jan 25, 2018

@drahnr Concourse used to set the quota. We're now testing if not doing that improves things.

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drahnr commented Jan 26, 2018

@vito good to know, I wasn't aware of that, but I also didn't look into the storage driver source (yet)

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fkoclas commented Jan 29, 2018

After some more extensive testing, I confirm this RC is also stable when using btrfs baggage claim fs on top of XFS, hence creating a loopbackfs.

Looking good, looking good. 👍

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vito commented Jan 29, 2018

@fkoclas Great! Thanks for keeping a short feedback loop.

I don't think we're quite ready to switch the default driver yet, but this fix will at least be in the next release (3.9).

I'm going to mark this done and leave #1404 open until we decide to switch the driver.

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leshik commented Mar 23, 2018

@vito @fkoclas I'm using Concourse in docker-compose, and recently I switched my whole /var/lib/docker to btrfs due to performance issues with overlay2. Therefore Concourse now uses btrfs automatically, but I started to experience that issue with hanging workers now. I'm on 3.9.2. Could switching back to overlay2 in docker, and then to btrfs baggage claim loopback on top of ext4 (or xfs? which one is better?) help, or it doesn't matter?

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leshik commented Mar 27, 2018

It didn't help, unfortunately. And overlay2 is painfully slow.

vito added a commit that referenced this issue Aug 15, 2018

bump etree tsa handlers mux clockwork goxmldsig genproto grpc
Submodule src/github.com/beevik/etree 90dafc1e..4cd0dd97 (rewind):
  < add attribute sort support.
  < Release v1.0.1
  < Update path documentation.
  < Minor code reordering.
  < add support for absolute path queries.
  < Update travis config.
  < fix bug in GetRelativePath.
  < Modify GetPath and GetRelativePath.
  < Added a GetPath() and GetRelativePath() to get the paths of an element.
  < Update travis config
  < Added filterText type
  < Added [text()] syntax to retrieve all elements with non empty text
  < path: add text filters
  < Fix broken Markdown headings
  < Add Permissive read setting.
  < Fix unit test.
Submodule src/github.com/concourse/tsa 49a729b6..e1df238c:
  > fix race/panic in tsa suite
Submodule src/github.com/gorilla/handlers 7e0847f9..3a5767ca (rewind):
  < added ability to register custom log formatter (#131)
  < Fix typo in cors.go (#127)
  < [bugfix] Handle CORS pre-flight request in middleware (#112)
  < Revert "Add Vary header when allowedOrigins is * (#114)" (#122)
  < Add Vary header when allowedOrigins is * (#114)
  < distinguish between explicit and implicit star (#118)
  < [bugfix] Don't return the origin header when configured to * (#116)
  < Travis go18 (#106)
  < use http.StatusOK as initial value for responseLogger.status (#103)
  < README.md: Add sourcegraph badge
  < Merge pull request #97 from nwidger/master
Submodule src/github.com/gorilla/mux e48e440e..9fa818a4 (rewind):
  < Add test for multiple calls to Name(). Fixes #394
  < Clarify behaviour of Name method if called multiple times.
  < Update LICENSE & AUTHORS files. (#386)
  < Initialize user map (#371)
  < [deps] Add go.mod for versioned Go (#376)
  < [docs] Improve docstrings for middleware, skipclean (#375)
  < [docs] Doc fix for testing variables in path (#374)
  < Add CORSMethodMiddleware (#366)
  < Fix linter issues (docs) (#370)
  < [build] Update Go versions; add 1.10.x (#364)
  < Fix table-driven example documentation (#363)
  < Make Use() variadic (#355)
  < Modify http status code to variable in README (#350)
  < Modify 403 status code to const variable (#349)
  < Create authentication middleware example. (#340)
  < [docs] Clarify SetURLVars (#335)
  < [docs] Document route.Get* methods consistently (#338)
  < [docs] README.md: Improve "walking routes" example. (#337) (#323)
  < README.md: add miss "time" (#336)
  < [docs] Fix doc.go (#333)
  < [docs] Add testing example (#331)
  < [docs] Fix Middleware docs typos (#332)
  < Update doc.go: r.AddMiddleware(...) -> r.Use(...)
  < Make shutdown docs compilable (#330)
  < [feat] Add middleware support as discussed in #293 (#294)
  < [docs] Add graceful shutdown example (#329)
  < refactor routeRegexp, particularily newRouteRegexp. (#328)
  < Public test API to set URL params (#322)
  < [docs] Add example usage for Route.HeadersRegexp (#320)
  < [docs] Note StrictSlash re-direct behaviour #308 (#321)
  < Create ISSUE_TEMPLATE.md (#318)
  < [bugfix] Fix method subrouter handler matching (#300) (#317)
  < [docs] fix outdated UseEncodedPath method docs (#314)
  < MatchErr is set to ErrNotFound if NotFoundHandler is used (#311)
  < [docs] Document router.Match (#313)
  < [build] Allow tip failures (#312)
  < .travis.yml: Remove versions < go1.5 from build matrix
  < use req.URL.EscapedPath() instead of getPath(req) (#306)
  < GetQueryTemplates and GetQueryRegexp extraction (#304)
  < Added 1.9 build step (#303)
  < Fix WriteHeader in TestA301ResponseWriter. (#301)
  < [docs] Document evaluation order for routes (#297)
  < [docs] README.md: add missing `.` (#292)
  < [docs] Fix missing space in docstring (#289)
  < Fix #271:  Return 405 instead of 404 when request method doesn't match the route
  < Prefer scheme on child route when building URLs.
  < Use scheme from parent router when building URLs.
  < Fix typo
  < Add test and fix for escaped query values.
  < Update docs.
  < Add tests for support for queries in URL reversing.
  < Add support for queries in URL reversing.
  < Update Walking Routes Section
  < Fix invalid example code
  < Removing half of conflict marker (#268)
  < Update README with example for Router.Walk
  < Update ancestors parameter for WalkFunc for matcher subrouters
  < Update Walk to match all subrouters
  < Support building URLs with non-http schemes. (#260)
  < Updated README
  < Added method Route.GetMethods
  < Added method Route.GetPathRegexp
  < fixed typo (#250)
  < Fixing Regexp in the benchmark test (#234)
  < updating logic in route matcher, cleaner and saner (#235)
  < Merge pull request #232 from DavidJFelix/patch-1
  < Add Go 1.8 to .travis.yml
  < [bugfix] fail fast if regex is incorrectly specified using capturing groups. (#218)
  < [docs] Add route listing example to README
  < Merge pull request #199 from wirehead/minor-doc-tweek
  < Merge pull request #215 from ShaneSaww/fix_for_subroutes_with_pathPrefix
  < Merge pull request #196 from olt/doc-non-capture-groups
  < Add useEncodedPath option to router and routes (#190)
  < Simplify extractVars, fixes edge cases. (#185)
  < make the getPath method safer, fixing panics within App Engine (#189)
  < Add mechanism to route based on the escaped path (#184)
  < .travis.yml: add go1.7
  < [docs] Add logo to README. (#180)
  < [docs] Add static file example to README; doc.go. (#179)
  < Clean up some naming in mux_test.go
  < [bugfix] Fix error handling in Router.Walk (#177)
  < [docs] README typo (#175)
Submodule src/github.com/jonboulle/clockwork e7c6d408..bcac9884 (rewind):
  < README: Fix "Faking time" Golang playground anchor (#16)
  < travis: bump go version (#15)
  < Add support for fake tickers (#8)
Submodule src/github.com/russellhaering/goxmldsig 7acd5e4a..eaac44c6 (rewind):
  < Treat the xml namespace as already declared during exclusive c14n
  < Avoid mutating the original tree when performing transforms
  < Correctly build a surrounding NSContext to locate SignedInfo
  < In NSFindIterateCtx pass the surrounding context of found elements instead of their own context
  < Improve the efficiency of traversing Signature searching for SignedInfo
  < Improve namespace handling when locating CanonicalizationMethod
  < Improve namespace handling in locating SignedInfo
  < Add etreeutils support for iterating and searching of direct children
  < Actually expand travis test matrix
  < Expand go runtime test matrix
  < Merge pull request #33 from apilloud/chain
  < Merge pull request #31 from skyportsystems/master
  < Merge pull request #35 from danikarik/master
  < Merge pull request #34 from otto-md/master
  < Merge pull request #30 from skyportsystems/master
  < Merge pull request #27 from gravitational/rjones/signature
  < Merge pull request #26 from aidansteele/patch-1
Submodule src/google.golang.org/genproto 383e8b2c..411e09b9 (rewind):
  < Add response field to HttpRule (#87)
  < re-enable 1.6
  < update from googleapis (#88)
  < update from googleapis (#85)
  < update from googleapis (#84)
  < update from googleapis (#83)
  < Revert "update from googleapis (#80)" (#81)
  < update from googleapis (#80)
  < update from googleapis (#79)
  < regen: use api-common-protos (#78)
  < update from googleapis (#76)
  < regenerate (#75)
  < update protos using new go protoc plugin (#73)
  < regen speech pb.gos (#72)
  < update from googleapis (#71)
  < update from googleapis (#69)
  < Update bigtable from googleapis (#70)
  < add cloud tasks protos (#67)
  < update from googleapis (#65)
  < update from googleapis (#63)
  < update from googleapis (#62)
  < update from googleapis (#61)
  < update cloudbuild (#60)
  < update from googleapis (#59)
  < update from googleapis (#58)
  < update generated files from googleapis for googleapis/spanner/* (#57)
  < update from googleapis (#56)
  < update from googleapis (#55)
  < update from googleapis (#54)
  < update generated file for googleapis/spanner/* (#53)
  < update from googleapis (#52)
  < add codeowners (#50)
  < update from googleapis (#49)
  < update from googleapis (#48)
  < update from googleapis (#47)
  < update from googleapis (#45)
  < update generated files (#43)
  < update googleapis (#42)
  < regenerate protos (#41)
  < firestore: add generated client (#40)
  < regenerate from updated googleapis (#39)
  < update from googleapis (#38)
  < update from googleapis and protobuf (#37)
  < regenerated from updated googleapis (#36)
  < regenerate speech client (#35)
  < all: regenerate from googleapis (#32)
  < regenerate with proper protobuf path (#31)
  < all: regenerate from latest googleapis (#29)
  < make travis go get cloud.google.com/go/... (#28)
  < release videointelligence (#26)
  < all: regenerate from googleapis (#25)
Submodule src/google.golang.org/grpc 07ef407d9..0e8b58d22 (rewind):
  < channelz: unexport unnecessary API on grpc entities (#2257)
  < channelz: use atomic instead of mutex (#2218)
  < internal: remove TestingUseHandlerImpl (#2253)
  < update proto generated code (#2254)
  < Revert "internal: remove transportMonitor, replace with callbacks" (#2252)
  < internal: remove transportMonitor, replace with callbacks (#2219)
  < Change version to 1.15.0-dev (#2247)
  < interop: implement special_status_message interop test (#2241)
  < internal/grpcsync: introduce package for synchronization (#2244)
  < remove 1.6 support for channelz (#2242)
  < transport: eliminate StreamError; use status errors instead (#2239)
  < transport: replace ClientTransport with *http2Client for internal usage (#2238)
  < disable go1.6 travis tests (#2237)
  < go generate: update proto files (#2236)
  < ClientConn: add Target() returning target string (#2233)
  < client: define dialOptions as interfaces instead of functions (#2230)
  < interop: loosen restrictions on creds per test in interop client (#2231)
  < Convert io.ErrUnexpectedEOF to a codes.Internal-marked status in toRPCerr. (#2228)
  < internal/transport: remove unnecessary ServerTransport method (#2224)
  < internal/transport_test.go: prevent leaking context (#2227)
  < internal/syscall: add package description (#2226)
  < transport.go: minor typo fix (#2225)
  < resolver: document that SetDefaultScheme should be called at init time (#2217)
  < addrconn: remove unused wait() method (#2220)
  < dns resolver: exponential retry when getting empty address list (#2201)
  < internal/transport: remove some unused fields from structs (#2213)
  < internal: move DialOptions to a new file (#2193)
  < Benchmark: fix build tags (#2099)
  < transport: move to internal to make room for new, public transport API (#2212)
  < balancer: add rpc method to PickOptions (#2204)
  < transport: double-check deadline when processing server cancelation (#2211)
  < createTransport: timeout under waitForHandshake case should not have transport transferred to ready stage (#2208)
  < deprecate stream, move documentation to client|server stream (#2198)
  < Set and respect HTTP/2 SETTINGS_MAX_HEADER_LIST_SIZE (#2084)
  < travis: skip race testing on 386 as it is not supported (#2207)
  < internal: changes to travis to make it do less work (#2200)
  < stream: in withRetry, block until Status is valid and check on io.EOF (#2199)
  < grpclb: s/fmt.Errorf/errors.New/ (#2196)
  < Fix flaky test: TestClientStreamingError (#2192)
  < Add documentation for loopy. (#2169)
  < Fix test: wait on server to signal successful accept. (#2183)
  < Allow interop client to use call creds on any secure channel (#2185)
  < client: Implement gRFC A6: configurable client-side retry support (#2111)
  < documentation: clarify SendMsg documentation (#2171)
  < credentials: cleanup version-specific files (#2178)
  < Restrict channelz service test to x86 architecture (#2179)
  < client, server: update dial/server buffer options to support a "disable" setting (#2147)
  < credentials: add more appengine build tags (#2177)
  < Revert stickiness (#2175)
  < minor fix: remove redundant channelz files (#2176)
  < channelz: stage 4 - add security and socket option info with appengine build tags (#2149)
  < Update flow control test to have multiple concurrent streams. (#2170)
  < balancer/grpclb: update to latest lb proto (#2172)
  < resolver/dns: error if target ends with a colon instead of assuming the default port (#2150)
  < grpclb: remove old grpclb generated code  (#2143)
  < testing: run test in simulated appengine environment (#2145)
  < interop: set dns as default scheme in interop client (#2165)
  < Change version to 1.14.0-dev (#2163)
  < Don't log grpclb server ending connection as error (#2162)
  < channelz: move APIs to internal except channelz service (#2157)
  < transport: notify controlbuf that transport is gracefully closing to ensure proper cleanup (#2158)
  < Register incoming stream with loopy as soon as it gets created. (#2144)
  < Import grpclb package in the interop client (#2155)
  < fix: do not percent encode character tilde (#2139)
  < grpclb: backoff for RPC call if init handshake was unsucessful (#2077)
  < status: handle invalid utf-8 characters (#2109) (#2134)
  < Don't do extra work for keepalive when it's disabled. (#2148)
  < internal: move backoff to internal (#2141)
  < Fix flaky tests in transport. (#2120)
  < internal: Change Lock to RLock since no mutation is performed (#2142)
  < grpclb: remove redundent testing struct (#2126)
  < Normalize gRPC LB
  < Fix test: Account for the fact that Dial can return successfully before Accept. (#2123)
  < Add some debug info (#2136)
  < Documentation: create doc describing grpc-go's log levels and their usages (#2033)
  < internal: Update proto generated code (#2133)
  < resolver_conn_wrapper.go: fix minor typo (#2135)
  < internal: move leakcheck to internal/ (#2129)
  < Revert "status: handle invalid utf-8 characters" (#2127)
  < status: handle invalid utf-8 characters (#2109)
  < Revert " channelz: stage 4 - add security and socket option info" (#2124)
  < grpclb: minor fixes on comments and tests (#2122)
  < channelz: stage 4 - add security and socket option info (#2098)
  < Split grpclb out of top level grpc package (#2107)
  < Reduce error logs in transport. (#2117)
  < DNS resolver: Throw an error for non-default DNS authority. (#2067)
  < grpclb: sync messages.proto and update client load reporting (#2101)
  < alts: copy handshake address in Clone() (#2119)
  < codes: fix: marshal/unmarshal a Code to JSON fails (#2116)
  < Account for user configured small io write buffer. (#2092)
  < clarify CloseSend vs CloseAndRecv; better formatting (#2071)
  < internal/grpcrand: New package for concurrency-safe randoms (#2106)
  < Clarify newCCResolverWrapper documentation. (#2100)
  < Revert "channelz: stage 4 - add security and socket option info" (#2096)
  < channelz: stage 4 - add security and socket option info (#1965)
  < stickiness: limit the max count of stickiness keys (#2021)
  < Benchmarks that runs server and client and separate processes. (#1952)
  < Synchronize WriteStatus with WriteHeader on server. (#2074)
  < internal: update proto generated code (#2093)
  < health: generate health proto from grpc-proto (#2081)
  < internal: remove redundant channelz service go generate (#2085)
  < Revert "Strip port from server name in grpclb (#2066)" (#2083)
  < channelz: generate proto from grpc-proto repo (#2082)
  < internal: move version to a separate file (#2080)
  < internal: fix travis failure on alts proto (#2079)
  < test: make end2end test use split grpc / proto imports (#2069)
  < credentials/alts: make go:generate rebuild alts protos (#2056)
  < channelz: split channelz grpc and pb (#2068)
  < Strip port from server name in grpclb (#2066)
  < benchmark: listen on all addresses in benchmark servers (#2073)
  < regenerate *.pb.go files due to proto-gen-go update (#2070)
  < transport: respect http2 setting SETTINGS_HEADER_TABLE_SIZE (#2045)
  < Add AuthInfoFromContext utility API (#2062)
  < Fix possible data loss; Only let reader goroutine handle connection errors. (#1993)
  < split encode into three functions (#2058)
  < small documentation addition to NewStream (#2060)
  < Documentation: Add initial documentation on concurrency (#2034)
  < status: Introduce FromContextError convenience function (#2057)
  < Change version to 1.13.0-dev (#2054)
  < client: introduce WithDisableServiceConfig DialOption (#2010)
  < fix flaky test caused by race in channelz test (#2051)
  < Fix typo (#2050)
  < Ignore metadata that gRPC explicitly sets. (#2026)
  < internal: better test names (#2043)
  < Revert "Less mem (#1987)" (#2049)
  < client: fix interceptors after recent cleanup (#2046)
  < internal: vet.sh quits when it sees macosx (#2048)
  < channelz: update proto to canonical version and rename directory (#2044)
  < interop: Fix unimplemented method test (#2040)
  < health: set health proto canonical path (#2038)
  < Fix "deprecated" function godoc comments to match standard formatting (#2027)
  < proto: update generated code (#2039)
  < Rename proto import. (#2036)
  < Fix typos. (#2035)
  < credentials/alts: Refer to ALTS gRPC types by a different package (#2028)
  < http2Client: send reset stream when closing the stream on protocol error (#2030)
  < Stage 3: Channelz server implementation (#1919)
  < Less mem (#1987)
  < server: export ServerTransportStreamFromContext for unary interceptors to control headers/trailers (#2019)
  < dns resolver: create rand seed at init time (#2007)
  < vet: disallow importing "unsafe" (#2024)
  < stickiness: avoid using unsafe (#2023)
  < Fix typos (#2020)
  < travis: skip vet install for 386 (#2018)
  < stickiness: add stickiness support (#1969)
  < Stage 2: Channelz metric collection (#1909)
  < credentials/alts: Add ServiceOption for server-side ALTS creation (#2009)
  < documentation: add instructions for running tests locally (#2006)
  < go vet: fix composite literal uses unkeyed fields (#2005)
  < documentation: add OAuth2 doc and example (#2003)
  < reflection: regenerate pb.go file after typo fix (#2002)
  < Remove unnecessary type conversions (unconvert) (#1995)
  < Fix typos (#1994)
  < Merge pull request #1996 from knweiss/gosimple
  < documentation: mention DialContext is non-blocking by default (#1970)
  < documentation: mention Register functions should be call at init time (#1975)
  < cleanup: extend dial context for TestFailFastRPCErrorOnBadCertificates to 10 seconds (#1984)
  < Fix Test: race between t.Write() and t.closeStream()  (#1989)
  < Small test readability fixes (#1985)
  < documentation: mention peer will only be populated after RPC completes (#1982)
  < Channelz: more stable tesing (#1983)
  < grpclb: fix issues caused by caching SubConns (#1977)
  < createTransport: check for SHUTDOWN before assigning TransientFailure to ac.state  (#1979)
  < resolver/dns: Typo in lookupHost failure warning (#1981)
  < Channelz: Entity Registration and Deletion (#1811)
  < clientconn: add support for unix network in DialContext. (#1883)
  < documentation: Mark compresser and decompresser as deprecated (#1971)
  < grpclb: cache SubConns for 10 seconds after it is removed from the backendlist (#1957)
  < internal: clean up deprecated Invoke() usage (#1966)
  < Mark old balancer and naming APIs as deprecated (#1951)
  < Export changes to OSS. (#1962)
  < metadata: Add Get, Set, and Append methods to metadata.MD (#1940)
  < server: add grpc.Method function for extracting method from context (#1961)
  < resolver/manual: fix minor typo (#1960)
  < status: remove redundant import (#1947)
  < client: Fix race when using both client-side default CallOptions and per-call CallOptions (#1948)
  < Change version to 1.12.0-dev (#1946)
  < resolver: keep full unparsed target string if scheme in parsed target is not registered (#1943)
  < status: rename Status to GRPCStatus to avoid name conflicts (#1944)
  < status: Allow external packages to produce status-compatible errors (#1927)
  < Merge pull request #1941 from jtattermusch/routeguide_reimplement_distance
  < service reflection can lookup enum, enum val, oneof, and field symbols (#1910)
  < Documentation: Fix broken link in rpc-errors.md (#1935)
  < Correct Go 1.6 support policy (#1934)
  < Add documentation and example of adding details to errors (#1915)
  < Allow storing alternate transport.ServerStream implementations in context (#1904)
  < Fix Test: Update the deadline since small deadlines are prone to flakes on Travis. (#1932)
  < gzip: Add ability to set compression level (#1891)
  < credentials/alts: Remove the enable_untrusted_alts flag (#1931)
  < metadata: Fix bug where AppendToOutgoingContext could modify another context's metadata (#1930)
  < fix minor typos and remove grpc.Codec related code in TestInterceptorCanAccessCallOptions (#1929)
  < credentials/alts: Update ALTS "New" APIs (#1921)
  < client: export types implementing CallOptions for access by interceptors (#1902)
  < travis: add Go 1.10 and run vet there instead of 1.9 (#1913)
  < stream: split per-attempt data from clientStream (#1900)
  < stats: add BeginTime to stats.End (#1907)
  < Reset ping strike counter right before sending out data. (#1905)
  < resolver: always fall back to default resolver when target does not follow URI scheme (#1889)
  < server: Convert all non-status errors to codes.Unknown (#1881)
  < credentials/alts: change ALTS protos to match the golden version (#1908)
  < credentials/alts: fix infinite recursion bug [in custom error type] (#1906)
  < Fix test race: Atomically access minConnecTimout in testing environment. (#1897)
  < interop: Add use_alts flag to client and server binaries (#1896)
  < ALTS: Simplify "New" APIs (#1895)
  < Fix flaky test: TestCloseConnectionWhenServerPrefaceNotReceived (#1870)
  < examples: Replace context.Background with context.WithTimeout (#1877)
  < alts: Change ALTS proto package name (#1886)
  < Add ALTS code (#1865)
  < Expunge error codes that shouldn't be returned from library (#1875)
  < Small spelling fixes (unknow -> unknown) (#1868)
  < clientconn: fix a typo in GetMethodConfig documentation (#1867)
  < Change version to 1.11.0-dev (#1863)
  < benchmarks: add flag to benchmain to use bufconn instead of network (#1837)
  < addrConn: Report underlying connection error in RPC error (#1855)
  < Fix data race in TestServerGoAwayPendingRPC (#1862)
  < addrConn: keep retrying even on non-temporary errors (#1856)
  < transport: fix race causing flow control discrepancy when sending messages over server limit (#1859)
  < interop test: Expect io.EOF from stream.Send() (#1858)
  < metadata: provide AppendToOutgoingContext interface (#1794)
  < Add status.Convert convenience function (#1848)
  < streams: Stop cleaning up after orphaned streams (#1854)
  < transport: support stats.Handler in serverHandlerTransport (#1840)
  < Fix connection drain error message (#1844)
  < Implement unary functionality using streams (#1835)
  < Revert "Add WithResolverUserOptions for custom resolver build options" (#1839)
  < Stream: do not cancel ctx created with service config timeout (#1838)
  < Fix lint error and typo (#1843)
  < stats: Fix bug causing trailers-only responses to be reported as headers (#1817)
  < transport: remove unnecessary rstReceived (#1834)
  < transport: remove redundant check of stream state in Write (#1833)
  < client: send RST_STREAM on client-side errors to prevent server from blocking (#1823)
  < Use keyed fields for struct initializers (#1829)
  < encoding: Introduce new method for registering and choosing codecs (#1813)
  < compare atomic and mutex performance in case of contention. (#1788)
  < transport: Fix a data race when headers are received while the stream is being closed (#1814)
  < Write should fail when the stream was done but context wasn't cancelled. (#1792)
  < Explain target format in DialContext's documentation (#1785)
  < gzip: add Name const to avoid typos in usage (#1804)
  < remove .please-update (#1800)
  < Documentation: update broken wire.html link in metadata package. (#1791)
  < Document that all errors from RPCs are status errors (#1782)
  < update const order (#1770)
  < Don't set reconnect parameters when the server has already responded. (#1779)
  < credentials: return Unavailable instead of Internal for per-RPC creds errors (#1776)
  < Avoid copying headers/trailers in unary RPCs unless requested by CallOptions (#1775)
  < Update version to 1.10.0-dev (#1777)
  < compare atomic and mutex performance for incrementing/storing one variable (#1757)
  < Fix flakey test. (#1771)
  < grpclb: Remove duplicate init() (#1764)
  < server: fix bug preventing Serve from exiting when Listener is closed (#1765)
  < Fix TestGracefulStop flakiness (#1767)
  < server: fix race between GracefulStop and new incoming connections (#1745)
  < Notify parent ClientConn to re-resolve in grpclb (#1699)
  < Add dial option to set balancer (#1697)
  < Fix test: Data race while resetting global var. (#1748)
  < status: add Code convenience function (#1754)
  < vet: run golint on _string files (#1749)
  < examples: fix concurrent map accesses in route_guide server (#1752)
  < grpc: fix deprecation comments to conform to standard (#1691)
  < Adjust keepalive paramenters in the test such that scheduling delays don't cause false failures too often. (#1730)
  < fix typo (#1746)
  < fix stats flaky test (#1740)
  < relocate check for shutdown in ac.tearDown() (#1723)
  < fix flaky TestPickfirstOneAddressRemoval (#1731)
  < bufconn: allow readers to receive data after writers close (#1739)
  < After sending second goaway close conn if idle. (#1736)
  < Make sure all goroutines have ended before restoring global vars. (#1732)
  < client: fix race between server response and stream context cancellation (#1729)
  < In gracefull stop close server transport only after flushing status of the last stream. (#1734)
  < Deflake tests that rely on Stop() then Dial() not reconnecting (#1728)
  < Switch balancer to grpclb when at least one address is grpclb address (#1692)
  < Merge pull request #1724 from grpc/jtattermusch-patch-1
  < codes: Add UnmarshalJSON support to Code type (#1720)
  < naming: Fix build constraints for go1.6 and go1.7 (#1718)
  < remove stringer and go generate (#1715)
  < Add WithResolverUserOptions for custom resolver build options (#1711)
  < Fix grpc basics link in route_guide example (#1713)
  < Optimize codes.String() method using a switch instead of a slice of indexes (#1712)
  < Disable ccBalancerWrapper when it is closed (#1698)
  < Refactor roundrobin to support custom picker (#1707)
  < Change parseTimeout to not handle non-second durations (#1706)
  < make load balancing policy name string case-insensitive (#1708)
  < protoCodec: avoid buffer allocations if proto.Marshaler/Unmarshaler (#1689)
  < Add comments to ClientConn/SubConn interfaces to indicate new methods may be added (#1680)
  < client: backoff before reconnecting if an HTTP2 server preface was not received (#1648)
  < use the request context with net/http handler (#1696)
  < transport: fix race sending RPC status that could lead to a panic (#1687)
  < Fix misleading default resolver scheme comments (#1703)
  < Eliminate data race in ccBalancerWrapper (#1688)
  < Re-resolve target when one connection becomes TransientFailure (#1679)
  < New grpclb implementation (#1558)
  < Fix panics on balancer and resolver updates (#1684)
  < Change version to 1.9.0-dev (#1682)
  < set context timeout when Timeout value >= 0 (#1678)
  < switch balancer based on service config info (#1670)
  < Add proper support for 'identity' encoding type (#1664)
  < update code_string.go for new stringer changes (#1674)
  < addrConn: set ac.state to TransientFailure upon non-temporary errors (#1657)
  < Eliminate race on ac.acbw (#1666)
  < Corrected documentation on Server.Serve (#1668)
  < Update picker doc when returned SubConn is not ready (#1659)
  < travis: fix GOARCH=386 and add misspell check (#1658)
  < Add context benchmarks (#1610)
  < Add protoc command to example/readme (#1653)
  < Implement transparent retries for gRFC A6 (#1597)
  < server: add EXPERIMENTAL tag to grpc.ConnectTimeout (#1652)
  < *: replace deprecated grpc.Errorf calls with status.Errorf (#1651)
  < server: apply deadline to new connections until all handshaking is completed (#1646)
  < codec_benchmark_test: fix racy unmarshal behavior and make some cleanups (#1642)
  < Speed-up quota pools. (#1636)
  < Check ac state shutdown before setting it to TransientFailure (#1643)
  < vet.sh: don't check git status when doing -install (#1641)
  < latency: Listen on localhost:0 instead of :0 in test (#1640)
  < reduce timeout for tests to 5m (7m for testrace) (#1635)
  < Introduce new Compressor/Decompressor API (#1428)
  < Fix settings ack race (#1630)
  < Update examples/README.md (#1629)
  < Get method string from stream (#1588)
  < fix max msg size type issues on different arch (#1623)
  < Deflake roundrobin TestOneServerDown, and fix test error messages (#1622)
  <  Remove self-imposed limit on max concurrent streams if the server doesn't impose any. (#1624)
  < Acquire all stream related quota and cache it locally since no more than one write can happen in parallel on stream (#1614)
  < Make travis 32-bit actually work (#1621)
  < balancer: reduce chattiness (#1608)
  < Revert "cap max msg size to min(max_int, max_uint32) (#1598)" (#1619)
  < cap max msg size to min(max_int, max_uint32) (#1598)
  < Fix parseTarget for unix socket address without scheme (#1611)
  < Fix connectivity state transitions when dialing (#1596)
  < Update go_package declarations (#1593)
  < ClientHandshake should get the dialing endpoint as the authority (#1607)
  < Add functions to ClientConn so it satisfies an interface for generated code (#1599)
  < Re-add support for Go1.6 (#1603)
  < Make passthrouth resolver the default instead of dns (#1606)
  < Fix goroutine leak in grpclb_test (#1595)
  < Add go report card (#1594)
  < Parse ServiceConfig JSON string (#1515)
  < Register and use default balancers and resolvers (#1551)
  < fix misspell (#1592)
  < Serve() should not return error on Stop() or GracefulStop() (#1485)
  < Remove single-entry var blocks (#1589)
  < update fail fast documentation to remove retry language (#1586)
  < Create versioning and release policy document (#1583)
  < Skip proxy_test in race mode (#1584)
  < transport: minor cleanups (comment and error text) (#1576)
  < Use proto3 in interop tests and end2end tests (#1574)
  < Change version to 1.8.0-dev (#1573)
  < Make resolver Build() take a target struct (#1567)
  < Revert "Temporary disable staticcheck" (#1568)
  < Update UnknownServiceHandler comment to be clearer about interceptor behavior (#1566)
  < transport: fix racey send to writes channel in WriteStatus (#1546)
  < fix stats test race (#1560)
  < Run tests without -v (#1562)
  < Remove Go1.6 support (#1492)
  < Temporary disable staticcheck (#1561)
  < fix TestServerCredsDispatch and stats test race (#1554)
  < Make interop client dial blocking (#1559)
  < benchmark: add type assertion benchmarks (#1556)
  < fix typo and lint (#1553)
  < transport: refactor of error/cancellation paths (#1533)
  < New implementation of roundrobin and pickfirst (#1506)
  < Update format string to match type (#1548)
  < add comment to dns package (#1545)
  < Make IO Buffer size configurable. (#1544)
  < Use the same hpack encoder on a transport and share it between RPCs. (#1536)
  < DNS with new API (#1513)
  < update markdown render (#1542)
  < Revert "Added localhost to net.Listen() calls to avoid macOS firewall dialog." (#1541)
  < Added localhost to net.Listen() calls to avoid macOS firewall dialog. (#1539)
  < transport: remove some defers (#1538)
  < Use Type() method for OAuth tokens instead of accessing TokenType field. (#1537)
  < benchmark: add primivites benchmark for Unlocking via defer vs. inline (#1534)
  < benchmain: format output of benchmark to a table (#1493)
  < Fix misspells (#1531)
  < vet.sh: set PATH to force downloaded binaries to be run (#1529)
  < Fix format error on travis (#1527)
  < Move primitives benchmarks to package primitives_test (#1522)
  < Speed up end to end tests by removing an unnecessary sleep (#1521)
  < Change quota version to uint32 instead on uint64 (#1517)
  < Fix deadline error on grpclb streams (#1511)
  < Dedicated goroutine for writing. (#1498)
  < benchmark: add primitives benchmarks for informational purposes (#1501)
  < Truncate payload trace string, and turn trace off by default (#1509)
  < Add leak goroutine checking to grpc/balancer tests (#1497)
  < Add RegisterIgnoreGoroutine to leakcheck package (#1507)
  < remove a debug print that causes deadlock (#1505)
  < vet.sh: fix protoc installation (#1502)
  < Add new Resolver and Balancer APIs (gRFC L9) (#1408)
  < Fix to avoid annoying firewall dialog on macOS (#1499)
  < Move leak check into a separate leakcheck package (#1445)
  < Change version to 1.7.0-dev (#1496)
  < Run Go1.9 and 386 on Travis (#1475)
  < Check "x/net/context" with `go vet` like "context" (#1490)
  < benchmain: add nop compressor and other usability tweaks (#1489)
  < Fix context warnings from govet. (#1486)
  < benchmain: minor bug fixes (#1488)
  < Update proto generation commands in example doc (#1481)
  < Remove expiration_interval from grpclb message (#1477)
  < balancer_test: possible ctx leak, cancel before break (#1479)
  < Merge pull request #1476 from dfawley/pkg
  < Fix for 32-bit architectures (#1471)
  < When sending a non heads-up goaway close the connection if there are no active streams. (#1474)
  < Remove unnecessary function handleStreamSuspension (#1468)
  < fix grpclb protos to not cause re-registration of types (#1466)
  < transport: fix handling of InTapHandle's returned context (#1461)
  < the cancel function should be called to avoid ctx leak (#1465)
  < add comment (#1464)
  < Remove buf copy when the compressor exist (#1427)
  < transport: Fix deadlock in client keepalive. (#1460)
  < benchmark: add benchmain/main.go to run benchmark with flag set (#1352)
  < stats: add methods to allow setting grpc-trace-bin and grpc-tags-bin headers (#1404)
  < deduplicate dns record in lookup (#1454)
  < Add -u to  installation command (#1451)
  < addrConn: change address to slice of address (#1376)
  < go-generate pb.go files and check in Travis to make sure they don't change (#1426)
  < Fix host string passed to PerRPCCredentials (#1433)
  < metadata: Remove NewContext and FromContext for gRFC L7 (#1392)
  < Add status details support to server HTTP handler (#1438)
  < put *gzip.Writer back to pool (#1441)
  < Automatic WriteStatus for RecvMsg/SendMsg error on server side (#1409)
  < Update ServerInHandle comments (#1437)
  < Server should send 2 goaway messages to gracefully shutdown the connection. (#1403)
  < Add and use connectivity package for states (#1430)
  < Add 'experimental' note to ServeHTTP godoc (#1429)
  < Document Server.ServeHTTP (#1406)
  < Set peer before sending request (#1423)
  < Fix missing and wrong license (#1422)
  < Fix a goroutine leak in DialContext (#1424)
  < Use `NewOutgoingContext ` in the metadata doc (#1425)
  < Fix typo
  < Add flags for tls file path (#1419)
  < Change comment on stats.End.Error (#1418)
  < Call cancel on contexts in tests (#1412)
  < Don't use 64-bit integers with atomic. (#1411)
  < benchmark: don't stop timer until after workers are done (#1407)
  < Validate send quota again after acquiring writable channel (#1367)
  < Use log instead of grpclog in routeguide example (#1395)
  < Revert "Make all "grpc-" metadata field names reserved (#1391)" (#1400)
  < Enabling client process multiple GoAways (#1393)
  < Assign testdata path to correct variable (#1397)
  < Do not call testdata.Path when defining flags (#1394)
  < Make all "grpc-" metadata field names reserved (#1391)
  < remove defer funtion in recvBufferReader Read method (#1031)
  < Add testdata package and unify testdata to only one dir (#1297)
  < DNS resolver (#1300)
  < Expose ConnectivityState of a ClientConn. (#1385)
  < status: Add WithDetails and Details functions (#1358)
  < benchmark: remove multi-layer for loop (#1339)
  < transport: fix minor typo in http2_server.go (#1383)
  < Add doc in default implementation fatal functions on os.Exit() (#1365)
  < Fix bufconn.Close to not be blocking. (#1377)
  < Do not create new addrConn when connection error happens (#1369)
  < Change version to 1.6.x (#1382)
  < Revert "Use bufconn in end2end tests." (#1381)
  < Fix logging method (#1375)
  < Use bufconn in end2end tests.
  < Create bufconn package for a local, buffered net.Conn and dialer/listener
  < Fix a typo in examples/gotutorial.md (#1374)
  < Use log severity and verbosity level (#1340)
  < fix deadlock of roundrobin balancer (#1353)
  < Ignore goroutines spanwned by log.init during leakcheck. (#1368)
  < Populate callInfo.peer object for streaming RPCs (#1356)
  < BDP estimation and window update. (#1310)
  < Canonicalize https://grpc.io as the preferred URL prefix
  < Update leckCheck to ignore non-gRPC goroutine introduced in Go1.9 (#1351)
  < Do not flush NewStream header on client side for unary RPCs and streaming RPCs with requests. (#1343)
  < adjust import order (#1311)
  < add license for some proto files (#1322)
  < latency: sleep in Write when BDP is exceeded to avoid buffer bloat (#1330)
  < Add documentation to deprecate WithTimeout dial option (#1333)
  < change objects in recvBuffer queue from interface to concrete type to reduce allocs (#1029)
  < Catch invalid use of Server.RegisterService after Register.Serve (#828)
  < benchmark: add latency/MTU/bandwidth into testcases (#1304)
  < Updated documentation of ClientStream. (#1320)
  < Add support for grpc.SupportPackageIsVersion3 back (#1331)
  < Deflake TestServerGoAway (#1321)
  < dont create new reader in recvMsg (#940)
  < Make Apache 2.0 LICENSE file a verbatim copy (#1329)
  < Protect bytesSent and bytesReceived with mutex to avoid datarace (#1318)
  < Add Severity and VerboseLevel to grpclog. (#922)
  < update LICENSE (#1312)
  < fix spell (#1314)
  < Add goroutine safety doc on stream (#1313)
  < replace 127.0.0.1 with localhost for ipv6 only environment (#1306)
  < transport: fix error handling on Stream deletion (#1275)
  < Behaviour Change: transport errors should be coded Unavailable instead of internal. (#1307)
  < Support ipv6 addresses in grpclb (#1303)
  < Return header in Stream.Header() if available (#1281)
  < add license for some files (#1296)
  < Make RPCs non-failfast in grpclb_test. (#1302)
  < Specify characters allowed in metadata keys (#1299)
  < use subtests for the benchmark_test and add it into the Makefile (#1278)
  < update the path of guide (#950)
  < Create latency package for realistically simulating network latency (#1286)
  < Deflake TestFlowContolLogicalRace (#1279)
  < Merge pull request #1290 from jtattermusch/apache_license
  < Change version to 1.5.0-dev (#1288)
  < transport: fix minor typo in 'GoAway' godoc (#1284)
  < Piggyback window updates for connection with those of a stream. (#1273)
  < Reopening: Server shouldn't Fatalf in case it fails to encode. (#1276)
  < Avoid int32 overflow when applying initial window size setting
  < Revert "Server shouldn't Fatalf in case it fails to encode. (#1251)" (#1274)
  < Server shouldn't Fatalf in case it fails to encode. (#1251)
  < Decouple transport flow control from application read. (#1265)
  < Update references to route_guide.proto to use new directory name (#1270)
  < add MaxConcurrentStreams to benchmark_test when start the server (#1271)
  < Merge pull request #1267 from jtattermusch/improve_contributing
  < re-enable handler_server in end2end test, and fix some failed tests (#1259)
  < Avoid panic caused by stdlib context package errors (#1258)
  < Initialize stream properly in handler_server. (#1260)
  < Expand stream's flow control in case of an active read. (#1248)
  < Suppress server log message when EOF without receiving data for preface (#1052)
  < Fixed comment spelling (#1254)
  < Merge pull request #1165 from lyuxuan/service_config_pr
  < clientconn, server: replace time.After with time.NewTimer (#998)
  < grpclb balancer.Close() should not panic if called more than once (#1250)
  < Add doc and example for mocking streaming RPCs (#1230)
  < Test for EmptyCallOption
  < Implement `EmptyCallOption`
  < Reuse Token for serviceAccount credentials (#1238)
  < Travis: add staticcheck (#1019)
  < Defined GA and add pointer to benchmarks (#1239)
  < call listen with "localhost:port" instead of ":port" in tests (#1237)
  < fix server panic trying to send on stream as client disconnects #1111 (#1115)
  < Eagerly set a pointer to nil to help GC (#1232)
  < add logs to grpclb on send and recv (#1235)
  < Add stats test for client streaming and server streaming RPCs (#1140)
  < Adding dial options for PerRPCCredentials (#1225)
  < Pass custom dialer to balancer (#1205)
  < Http status to grpc status conversion (#1195)
  < Calling handleRPC with context derived from the original (#1227)
  < Use pooled gzip.{Writer,Reader} in gzip{Compressor,Decompressor} (#1217)
  < tentative fix to a flow control over-give-back bug (#1170)
  < Ensure that RoundRobin.Close() does not panic. (#1139)
  < Log the actual error when inTapHandle fails in http2Server (#1185)
  < make ServerOption panic messages more clear. (#1194)
  < Make window size configurable. (#1210)
  < Reset proto before unmarshalling (#1222)
  < Merge pull request #1221 from adelez/doc_fixit
  < Fix go buildable source file problem (#1213)
  < don't add defer func if stats handler is nil (#1214)
  < Change version to 1.4.0-dev (#1212)
  < Fix nil pointer dereferences from status.FromProto(nil) (#1211)
  < Split grpclb client load report test to deflake test. (#1206)
  < Use unpadded base64 encoding for binary metadata headers; handle padded or unpadded input (#1209)
  < Never encode binary metadata within the metadata map (#1188)
  < Client load report for grpclb. (#1200)
  < Use proto.Equal for equalities on Go proto messages (#1204)
  < Update grpclb proto and move grpclb into package grpc (#1186)
  < Revert "temporary disable 1.6 on travis (#1198)" (#1199)
  < temporary disable 1.6 on travis (#1198)
  < Revert "To adhere with protocol the server should send RST_STREAM on observing timeout on a strea, (#1130)"
  < Make sure all in-flight streams close when ClientConn.Close() is called. (#1136)
  < To adhere with protocol the server should send RST_STREAM on observing timeout on a strea, (#1130)
  < Fix broken Markdown headings in examples/gotutorial.md (#1189)
  < Support proxy with dialer (#1098)
  < grpclb should connect to the second balancer (#1181)
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