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ZVOL minors related crash (i think) #4370

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sempervictus opened this issue Feb 26, 2016 · 2 comments
Closed

ZVOL minors related crash (i think) #4370

sempervictus opened this issue Feb 26, 2016 · 2 comments

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@sempervictus
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At first glance, looks like zil replay isnt playing too well with the zvol_create_minor functionality from 4346, which i believe was recently merged into master.
Tried to import a pool after an SCST crash and subsequent reboot, and got this fine mess:

[Thu Feb 25 23:37:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:37:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:37:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:37:48 2016] zpool           D ffff880c21003960     0  4651   4037 0x00000002
[Thu Feb 25 23:37:48 2016]  ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:37:48 2016]  ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:37:48 2016]  0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:37:48 2016] Call Trace:
[Thu Feb 25 23:37:48 2016]  [<ffffffff820a1372>] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:37:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:37:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:37:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:37:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03aecb9>] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03f105a>] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc0400673>] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc0401193>] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc04011de>] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc0362fea>] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc0363319>] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc0401397>] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03a2f54>] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03d1acc>] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03d4328>] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffff821ee81d>] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:37:48 2016]  [<ffffffff821ea7c3>] ? putname+0x53/0x60
[Thu Feb 25 23:37:48 2016]  [<ffffffff821eea79>] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:37:48 2016]  [<ffffffff827a2036>] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:37:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:37:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:37:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:37:48 2016] txg_quiesce     D ffff88060e26fd48     0  5854      2 0x00000000
[Thu Feb 25 23:37:48 2016]  ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:37:48 2016]  ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:37:48 2016]  0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:37:48 2016] Call Trace:
[Thu Feb 25 23:37:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:37:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:37:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:37:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03af21e>] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc03aef50>] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc00a52f1>] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:37:48 2016]  [<ffffffffc00a5280>] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:37:48 2016]  [<ffffffff82095a59>] kthread+0xc9/0xe0
[Thu Feb 25 23:37:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:37:48 2016]  [<ffffffff827a23cf>] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:37:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:40:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:40:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:40:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:40:48 2016] zpool           D ffff880c21003960     0  4651   4037 0x00000002
[Thu Feb 25 23:40:48 2016]  ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:40:48 2016]  ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:40:48 2016]  0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:40:48 2016] Call Trace:
[Thu Feb 25 23:40:48 2016]  [<ffffffff820a1372>] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:40:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:40:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:40:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:40:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03aecb9>] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03f105a>] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc0400673>] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc0401193>] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc04011de>] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc0362fea>] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc0363319>] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc0401397>] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03a2f54>] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03d1acc>] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03d4328>] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffff821ee81d>] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:40:48 2016]  [<ffffffff821ea7c3>] ? putname+0x53/0x60
[Thu Feb 25 23:40:48 2016]  [<ffffffff821eea79>] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:40:48 2016]  [<ffffffff827a2036>] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:40:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:40:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:40:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:40:48 2016] txg_quiesce     D ffff88060e26fd48     0  5854      2 0x00000000
[Thu Feb 25 23:40:48 2016]  ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:40:48 2016]  ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:40:48 2016]  0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:40:48 2016] Call Trace:
[Thu Feb 25 23:40:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:40:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:40:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:40:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03af21e>] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc03aef50>] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc00a52f1>] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:40:48 2016]  [<ffffffffc00a5280>] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:40:48 2016]  [<ffffffff82095a59>] kthread+0xc9/0xe0
[Thu Feb 25 23:40:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:40:48 2016]  [<ffffffff827a23cf>] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:40:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:43:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:43:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:43:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:43:48 2016] zpool           D ffff880c21003960     0  4651   4037 0x00000002
[Thu Feb 25 23:43:48 2016]  ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:43:48 2016]  ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:43:48 2016]  0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:43:48 2016] Call Trace:
[Thu Feb 25 23:43:48 2016]  [<ffffffff820a1372>] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:43:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:43:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:43:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:43:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03aecb9>] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03f105a>] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc0400673>] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc0401193>] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc04011de>] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc0362fea>] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc0363319>] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc0401397>] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03a2f54>] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03d1acc>] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03d4328>] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffff821ee81d>] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:43:48 2016]  [<ffffffff821ea7c3>] ? putname+0x53/0x60
[Thu Feb 25 23:43:48 2016]  [<ffffffff821eea79>] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:43:48 2016]  [<ffffffff827a2036>] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:43:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:43:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:43:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:43:48 2016] txg_quiesce     D ffff88060e26fd48     0  5854      2 0x00000000
[Thu Feb 25 23:43:48 2016]  ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:43:48 2016]  ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:43:48 2016]  0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:43:48 2016] Call Trace:
[Thu Feb 25 23:43:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:43:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:43:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:43:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03af21e>] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc03aef50>] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc00a52f1>] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:43:48 2016]  [<ffffffffc00a5280>] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:43:48 2016]  [<ffffffff82095a59>] kthread+0xc9/0xe0
[Thu Feb 25 23:43:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:43:48 2016]  [<ffffffff827a23cf>] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:43:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:46:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:46:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:46:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:46:48 2016] zpool           D ffff880c21003960     0  4651   4037 0x00000002
[Thu Feb 25 23:46:48 2016]  ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:46:48 2016]  ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:46:48 2016]  0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:46:48 2016] Call Trace:
[Thu Feb 25 23:46:48 2016]  [<ffffffff820a1372>] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:46:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:46:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:46:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:46:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03aecb9>] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03f105a>] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc0400673>] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc0401193>] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc04011de>] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc0362fea>] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc0363319>] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc0401397>] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03a2f54>] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03d1acc>] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03d4328>] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffff821ee81d>] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:46:48 2016]  [<ffffffff821ea7c3>] ? putname+0x53/0x60
[Thu Feb 25 23:46:48 2016]  [<ffffffff821eea79>] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:46:48 2016]  [<ffffffff827a2036>] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:46:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:46:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:46:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:46:48 2016] txg_quiesce     D ffff88060e26fd48     0  5854      2 0x00000000
[Thu Feb 25 23:46:48 2016]  ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:46:48 2016]  ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:46:48 2016]  0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:46:48 2016] Call Trace:
[Thu Feb 25 23:46:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:46:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:46:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:46:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03af21e>] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc03aef50>] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc00a52f1>] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:46:48 2016]  [<ffffffffc00a5280>] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:46:48 2016]  [<ffffffff82095a59>] kthread+0xc9/0xe0
[Thu Feb 25 23:46:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:46:48 2016]  [<ffffffff827a23cf>] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:46:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:49:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:49:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:49:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:49:48 2016] zpool           D ffff880c21003960     0  4651   4037 0x00000002
[Thu Feb 25 23:49:48 2016]  ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:49:48 2016]  ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:49:48 2016]  0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:49:48 2016] Call Trace:
[Thu Feb 25 23:49:48 2016]  [<ffffffff820a1372>] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:49:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:49:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:49:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:49:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03aecb9>] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03f105a>] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc0400673>] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc0401193>] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc04011de>] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc0362fea>] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03630a7>] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc04011d0>] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc0363319>] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc0401397>] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03a2f54>] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03d1acc>] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03d4328>] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffff821ee81d>] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:49:48 2016]  [<ffffffff821ea7c3>] ? putname+0x53/0x60
[Thu Feb 25 23:49:48 2016]  [<ffffffff821eea79>] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:49:48 2016]  [<ffffffff827a2036>] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:49:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:49:48 2016]       Tainted: P           OE   4.4.2-sv-i7 #sv
[Thu Feb 25 23:49:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:49:48 2016] txg_quiesce     D ffff88060e26fd48     0  5854      2 0x00000000
[Thu Feb 25 23:49:48 2016]  ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:49:48 2016]  ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:49:48 2016]  0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:49:48 2016] Call Trace:
[Thu Feb 25 23:49:48 2016]  [<ffffffff8279e635>] schedule+0x35/0xa0
[Thu Feb 25 23:49:48 2016]  [<ffffffffc00aa16d>] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:49:48 2016]  [<ffffffff820a7340>] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:49:48 2016]  [<ffffffffc00aa1b5>] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03af21e>] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc03aef50>] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc00a52f1>] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:49:48 2016]  [<ffffffffc00a5280>] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:49:48 2016]  [<ffffffff82095a59>] kthread+0xc9/0xe0
[Thu Feb 25 23:49:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60
[Thu Feb 25 23:49:48 2016]  [<ffffffff827a23cf>] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:49:48 2016]  [<ffffffff82095990>] ? kthread_park+0x60/0x60

@behlendorf and @bprotopopov, any thoughts on whether this is related? My patch stack is:

zfs-linux (0.6.5-1~sv20160222) trusty; urgency=medium

  * origin/pr/4326
  ** Add l2arc_max_block_size tunable
  * origin/pr/4334
  ** FreeBSD r256956: Improve ZFS N-way mirror read performance by using load and locality information.
  * origin/pr/2668
  ** Allow for "zfs receive" to skip existing snapshots
  * origin/pr/3169
  ** Add dfree_zfs for changing how Samba reports space
  * origin/pr/4170
  ** Make src const to avoid future mistakes
  * origin/pr/4186
  ** Allow -F to regenerate missing vdev labels
  * origin/pr/4223
  ** Do not lose properties when creating a pool with a temporary name
  * origin/pr/4333
  ** Revert "Wrap smp_processor_id in kpreempt_[dis|en]able" and "Fix CPU_SEQID use in preemptible context"
  * origin/pr/4343
  ** Add -gLp to zpool subcommands for alt vdev names
  * origin/pr/4346
  ** Close the race window in zvol_open() to prevent removal of
  * origin/pr/4351
  ** Require libblkid
  * tuxoko/abd_next
  ** Add dmu_write_abd
  * master @ 4b9ed698b4838a36daa591d08728a692095f8f01
@bprotopopov
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Contributor

Hi, there,

it is not clear from the stack traces in your email why the txg_sync thread is stalled (and txg_wait_synced() is hung).

Try using 'crash' and see what txg_sync is up to.

The code in 4346 fixes a few bugs, and at first look, I don't think it has introduced this issue.

Assuming that there is some sort of a deadlock that txg_sync is involved in, this could be an example of an issue that is addressed by the #3830

#3830

If it is hard to see what is up, I suggest getting the above pull request and seeing if the problem goes away.

Or maybe backing out 4346 as a troubleshooting step, if that is easier ?

Boris.

[https://avatars3.githubusercontent.com/u/2488505?v=3&s=400]#3830

issues #2217, #3681 - set of commits dealing with zvol ...#3830
github.com
Two issues are being addressed: improved performance of dmu_objset_find() scans called from zvol__minor_() operations, and a deadlock resulting from lock order ...

From: RageLtMan notifications@github.com
Sent: Friday, February 26, 2016 12:06 AM
To: zfsonlinux/zfs
Cc: Boris Protopopov
Subject: [zfs] ZVOL minors related crash (i think) (#4370)

At first glance, looks like zil replay isnt playing too well with the zvol_create_minor functionality from 4346, which i believe was recently merged into master.
Tried to import a pool after an SCST crash and subsequent reboot, and got this fine mess:

[Thu Feb 25 23:37:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:37:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:37:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:37:48 2016] zpool D ffff880c21003960 0 4651 4037 0x00000002
[Thu Feb 25 23:37:48 2016] ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:37:48 2016] ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:37:48 2016] 0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:37:48 2016] Call Trace:
[Thu Feb 25 23:37:48 2016] [] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:37:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:37:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:37:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:37:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:37:48 2016] [] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:37:48 2016] [] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:37:48 2016] [] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:37:48 2016] [] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:37:48 2016] [] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:37:48 2016] [] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:37:48 2016] [] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:37:48 2016] [] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:37:48 2016] [] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:37:48 2016] [] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:37:48 2016] [] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:37:48 2016] [] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:37:48 2016] [] ? putname+0x53/0x60
[Thu Feb 25 23:37:48 2016] [] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:37:48 2016] [] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:37:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:37:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:37:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:37:48 2016] txg_quiesce D ffff88060e26fd48 0 5854 2 0x00000000
[Thu Feb 25 23:37:48 2016] ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:37:48 2016] ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:37:48 2016] 0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:37:48 2016] Call Trace:
[Thu Feb 25 23:37:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:37:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:37:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:37:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:37:48 2016] [] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:37:48 2016] [] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:37:48 2016] [] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:37:48 2016] [] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:37:48 2016] [] kthread+0xc9/0xe0
[Thu Feb 25 23:37:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:37:48 2016] [] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:37:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:40:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:40:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:40:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:40:48 2016] zpool D ffff880c21003960 0 4651 4037 0x00000002
[Thu Feb 25 23:40:48 2016] ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:40:48 2016] ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:40:48 2016] 0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:40:48 2016] Call Trace:
[Thu Feb 25 23:40:48 2016] [] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:40:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:40:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:40:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:40:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:40:48 2016] [] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:40:48 2016] [] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:40:48 2016] [] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:40:48 2016] [] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:40:48 2016] [] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:40:48 2016] [] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:40:48 2016] [] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:40:48 2016] [] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:40:48 2016] [] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:40:48 2016] [] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:40:48 2016] [] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:40:48 2016] [] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:40:48 2016] [] ? putname+0x53/0x60
[Thu Feb 25 23:40:48 2016] [] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:40:48 2016] [] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:40:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:40:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:40:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:40:48 2016] txg_quiesce D ffff88060e26fd48 0 5854 2 0x00000000
[Thu Feb 25 23:40:48 2016] ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:40:48 2016] ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:40:48 2016] 0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:40:48 2016] Call Trace:
[Thu Feb 25 23:40:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:40:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:40:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:40:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:40:48 2016] [] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:40:48 2016] [] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:40:48 2016] [] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:40:48 2016] [] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:40:48 2016] [] kthread+0xc9/0xe0
[Thu Feb 25 23:40:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:40:48 2016] [] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:40:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:43:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:43:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:43:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:43:48 2016] zpool D ffff880c21003960 0 4651 4037 0x00000002
[Thu Feb 25 23:43:48 2016] ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:43:48 2016] ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:43:48 2016] 0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:43:48 2016] Call Trace:
[Thu Feb 25 23:43:48 2016] [] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:43:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:43:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:43:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:43:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:43:48 2016] [] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:43:48 2016] [] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:43:48 2016] [] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:43:48 2016] [] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:43:48 2016] [] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:43:48 2016] [] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:43:48 2016] [] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:43:48 2016] [] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:43:48 2016] [] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:43:48 2016] [] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:43:48 2016] [] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:43:48 2016] [] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:43:48 2016] [] ? putname+0x53/0x60
[Thu Feb 25 23:43:48 2016] [] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:43:48 2016] [] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:43:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:43:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:43:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:43:48 2016] txg_quiesce D ffff88060e26fd48 0 5854 2 0x00000000
[Thu Feb 25 23:43:48 2016] ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:43:48 2016] ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:43:48 2016] 0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:43:48 2016] Call Trace:
[Thu Feb 25 23:43:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:43:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:43:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:43:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:43:48 2016] [] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:43:48 2016] [] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:43:48 2016] [] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:43:48 2016] [] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:43:48 2016] [] kthread+0xc9/0xe0
[Thu Feb 25 23:43:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:43:48 2016] [] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:43:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:46:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:46:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:46:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:46:48 2016] zpool D ffff880c21003960 0 4651 4037 0x00000002
[Thu Feb 25 23:46:48 2016] ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:46:48 2016] ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:46:48 2016] 0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:46:48 2016] Call Trace:
[Thu Feb 25 23:46:48 2016] [] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:46:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:46:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:46:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:46:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:46:48 2016] [] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:46:48 2016] [] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:46:48 2016] [] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:46:48 2016] [] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:46:48 2016] [] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:46:48 2016] [] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:46:48 2016] [] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:46:48 2016] [] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:46:48 2016] [] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:46:48 2016] [] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:46:48 2016] [] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:46:48 2016] [] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:46:48 2016] [] ? putname+0x53/0x60
[Thu Feb 25 23:46:48 2016] [] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:46:48 2016] [] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:46:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:46:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:46:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:46:48 2016] txg_quiesce D ffff88060e26fd48 0 5854 2 0x00000000
[Thu Feb 25 23:46:48 2016] ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:46:48 2016] ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:46:48 2016] 0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:46:48 2016] Call Trace:
[Thu Feb 25 23:46:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:46:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:46:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:46:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:46:48 2016] [] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:46:48 2016] [] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:46:48 2016] [] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:46:48 2016] [] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:46:48 2016] [] kthread+0xc9/0xe0
[Thu Feb 25 23:46:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:46:48 2016] [] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:46:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:49:48 2016] INFO: task zpool:4651 blocked for more than 180 seconds.
[Thu Feb 25 23:49:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:49:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:49:48 2016] zpool D ffff880c21003960 0 4651 4037 0x00000002
[Thu Feb 25 23:49:48 2016] ffff880c21003960 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:49:48 2016] ffff880c241d4000 ffff880c2139a000 ffff880c2139a3f8 0000000000000000
[Thu Feb 25 23:49:48 2016] 0000000000000003 ffff880c21003938 ffffffff820a1372 ffff880c21004000
[Thu Feb 25 23:49:48 2016] Call Trace:
[Thu Feb 25 23:49:48 2016] [] ? default_wake_function+0x12/0x20
[Thu Feb 25 23:49:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:49:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:49:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:49:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:49:48 2016] [] txg_wait_synced+0xe9/0x130 [zfs]
[Thu Feb 25 23:49:48 2016] [] zil_replay+0xca/0x100 [zfs]
[Thu Feb 25 23:49:48 2016] [] __zvol_create_minor+0x663/0x670 [zfs]
[Thu Feb 25 23:49:48 2016] [] zvol_create_minor+0x33/0x70 [zfs]
[Thu Feb 25 23:49:48 2016] [] zvol_create_minors_cb+0xe/0x20 [zfs]
[Thu Feb 25 23:49:48 2016] [] dmu_objset_find_impl+0xfa/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016] [] dmu_objset_find_impl+0x1b7/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016] [] ? zvol_create_minor+0x70/0x70 [zfs]
[Thu Feb 25 23:49:48 2016] [] dmu_objset_find+0x49/0x70 [zfs]
[Thu Feb 25 23:49:48 2016] [] zvol_create_minors+0x47/0x60 [zfs]
[Thu Feb 25 23:49:48 2016] [] spa_import+0x464/0x730 [zfs]
[Thu Feb 25 23:49:48 2016] [] zfs_ioc_pool_import+0xdc/0x110 [zfs]
[Thu Feb 25 23:49:48 2016] [] zfsdev_ioctl+0x458/0x490 [zfs]
[Thu Feb 25 23:49:48 2016] [] do_vfs_ioctl+0x2cd/0x4b0
[Thu Feb 25 23:49:48 2016] [] ? putname+0x53/0x60
[Thu Feb 25 23:49:48 2016] [] SyS_ioctl+0x79/0x90
[Thu Feb 25 23:49:48 2016] [] entry_SYSCALL_64_fastpath+0x16/0x75
[Thu Feb 25 23:49:48 2016] INFO: task txg_quiesce:5854 blocked for more than 180 seconds.
[Thu Feb 25 23:49:48 2016] Tainted: P OE 4.4.2-sv-i7 #sv
[Thu Feb 25 23:49:48 2016] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[Thu Feb 25 23:49:48 2016] txg_quiesce D ffff88060e26fd48 0 5854 2 0x00000000
[Thu Feb 25 23:49:48 2016] ffff88060e26fd48 ffff88060743a554 0000000300000000 ffff88060743a554
[Thu Feb 25 23:49:48 2016] ffff880c241e0000 ffff880607446000 ffff8806074463f8 ffff880c2062ab40
[Thu Feb 25 23:49:48 2016] 0000000000000246 0000000000000003 0000000000000001 ffff88060e270000
[Thu Feb 25 23:49:48 2016] Call Trace:
[Thu Feb 25 23:49:48 2016] [] schedule+0x35/0xa0
[Thu Feb 25 23:49:48 2016] [] cv_wait_common+0xed/0x120 [spl]
[Thu Feb 25 23:49:48 2016] [] ? prepare_to_wait_event+0xf0/0xf0
[Thu Feb 25 23:49:48 2016] [] __cv_wait+0x15/0x20 [spl]
[Thu Feb 25 23:49:48 2016] [] txg_quiesce_thread+0x2ce/0x3e0 [zfs]
[Thu Feb 25 23:49:48 2016] [] ? txg_delay+0x160/0x160 [zfs]
[Thu Feb 25 23:49:48 2016] [] thread_generic_wrapper+0x71/0x80 [spl]
[Thu Feb 25 23:49:48 2016] [] ? __thread_exit+0x20/0x20 [spl]
[Thu Feb 25 23:49:48 2016] [] kthread+0xc9/0xe0
[Thu Feb 25 23:49:48 2016] [] ? kthread_park+0x60/0x60
[Thu Feb 25 23:49:48 2016] [] ret_from_fork+0x3f/0x70
[Thu Feb 25 23:49:48 2016] [] ? kthread_park+0x60/0x60

@behlendorfhttps://github.com/behlendorf and @bprotopopovhttps://github.com/bprotopopov, any thoughts on whether this is related? My patch stack is:

zfs-linux (0.6.5-1~sv20160222) trusty; urgency=medium

  • origin/pr/4326
    ** Add l2arc_max_block_size tunable
  • origin/pr/4334
    ** FreeBSD r256956: Improve ZFS N-way mirror read performance by using load and locality information.
  • origin/pr/2668
    ** Allow for "zfs receive" to skip existing snapshots
  • origin/pr/3169
    ** Add dfree_zfs for changing how Samba reports space
  • origin/pr/4170
    ** Make src const to avoid future mistakes
  • origin/pr/4186
    ** Allow -F to regenerate missing vdev labels
  • origin/pr/4223
    ** Do not lose properties when creating a pool with a temporary name
  • origin/pr/4333
    ** Revert "Wrap smp_processor_id in kpreempt_[dis|en]able" and "Fix CPU_SEQID use in preemptible context"
  • origin/pr/4343
    ** Add -gLp to zpool subcommands for alt vdev names
  • origin/pr/4346
    ** Close the race window in zvol_open() to prevent removal of
  • origin/pr/4351
    ** Require libblkid
  • tuxoko/abd_next
    ** Add dmu_write_abd
  • master @ 4b9ed69

Reply to this email directly or view it on GitHubhttps://github.com//issues/4370.

@behlendorf
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Closing. The finalized version of the async minor patches which were merged addressed this issue.

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@behlendorf @sempervictus @bprotopopov