zfs 0.3.6-1 kernel crash

[Mehul1313]

I see following zfs kernel crash in the event when there are bunch of zfs volumes clones, snaps mount/unmount, at the same time zfs send and receive going on. Any clue on if this is known bug or what is going on. I am running zfs 0.6.3-1 version.

 #0 [ffff8807b99d3a60] machine_kexec at ffffffff8103281b
 #1 [ffff8807b99d3ac0] crash_kexec at ffffffff810ba662
 #2 [ffff8807b99d3b90] oops_end at ffffffff81501290
 #3 [ffff8807b99d3bc0] die at ffffffff8100f26b
 #4 [ffff8807b99d3bf0] do_general_protection at ffffffff81500e22
 #5 [ffff8807b99d3c20] general_protection at ffffffff815005f5
    [exception RIP: list_del+16]
    RIP: ffffffff81282f00  RSP: ffff8807b99d3cd8  RFLAGS: 00010296
    RAX: dead000000200200  RBX: ffff8808201d0128  RCX: 0000000000000000
    RDX: ffff8808201d0000  RSI: 00000000ffffffff  RDI: ffff8808201d0128
    RBP: ffff8807b99d3ce8   R8: fffffffbcfb10c14   R9: 0000008000000000
    R10: ffff88069a159800  R11: 0000000000000000  R12: ffffffffa02ce0e0
    R13: ffff8806ab098780  R14: 0000000000000000  R15: ffff8806a91fb9c0
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #6 [ffff8807b99d3cf0] generic_shutdown_super at ffffffff8117d269
 #7 [ffff8807b99d3d10] kill_anon_super at ffffffff8117d306
 #8 [ffff8807b99d3d30] zpl_kill_sb at ffffffffa02be3ce [zfs]
 #9 [ffff8807b99d3d50] deactivate_super at ffffffff8117e380
#10 [ffff8807b99d3d70] zfs_sb_rele at ffffffffa029132a [zfs]
#11 [ffff8807b99d3d90] zfs_unmount_snap at ffffffffa0297099 [zfs]
#12 [ffff8807b99d3dd0] zfs_ioc_destroy at ffffffffa0297195 [zfs]
#13 [ffff8807b99d3df0] zfsdev_ioctl at ffffffffa0296f86 [zfs]
#14 [ffff8807b99d3e60] vfs_ioctl at ffffffff8118dec2
#15 [ffff8807b99d3ea0] do_vfs_ioctl at ffffffff8118e064
#16 [ffff8807b99d3f30] sys_ioctl at ffffffff8118e5e1
#17 [ffff8807b99d3f80] system_call_fastpath at ffffffff8100b0f2
    RIP: 00007fa8561907b7  RSP: 00007fa7d83f48b8  RFLAGS: 00010202
    RAX: 0000000000000010  RBX: ffffffff8100b0f2  RCX: 000000000000022f
    RDX: 00007fa7d83f4eb0  RSI: 0000000000005a18  RDI: 0000000000000004
    RBP: 00007fa7d83f8550   R8: 6661623630643662   R9: 3633326334623837
    R10: 65342d333061322d  R11: 0000000000000246  R12: 0000000000000004
    R13: 00007fa81c09f190  R14: 0000000000000000  R15: 00007fa81c09f180
    ORIG_RAX: 0000000000000010  CS: 0033  SS: 002b

[behlendorf]

Thanks for filing this.

[Mehul1313]

Would it make more sense to have include the patch from #2523 issues (Do not have this patch included yet), and re-run the test? We have seen this issue one more time in our environment. Please suggest. Thanks!

[behlendorf]

@Mehul1313 this crash looks unrelated to #2523 but I'd suggest applying the fix anyway. It's been rolled out as a point release to most of the distributions repositories. So you may just need to update your packages to pick it up.

[behlendorf]

This issue was resolved in the latest version.