On a recommendation I installed spl/zfs 6.5.9. Looks like the issue was
fixed in the chain somewhere between this and 6.5.9. The dataset came
back just fine.

That said, before closing out, where can I find Ubuntu 16.04 images? I
tried in vain but all I could seem to get my hands on were the updated
16.04.2.

Thank you.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to zfs-linux in Ubuntu.
https://bugs.launchpad.net/bugs/1677073

Title:
  ZFS pools are unstable after round of updates

Status in zfs-linux package in Ubuntu:
  New

Bug description:
  This problem has crippled my file server. This did not happen before
  an update. All information I can think to include is below.

  Uses LSI 9300-8i in IT mode to an Intel expander to HGST drives, all
  healthy and checked extensively via smartctl long and offline tests.

  Simply worked perfectly before apt update, and not at all after.
  Again, reinstalling has no effect.

  Accessing one dataset in particular, even just an "ls", hangs
  'updatedb' and causes cascading hangs in other processes and on NFS
  connected clients. Server will not reboot at that point, hanging
  forever on attempts to unmount the ZFS pool, forcing a hard shutdown.

  # uname -a
  Linux shareos 4.8.0-44-generic #47~16.04.1-Ubuntu SMP Wed Mar 22 18:51:56 UTC 
2017 x86_64 x86_64 x86_64 GNU/Linux

  # lsb_release -a
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 16.04.2 LTS
  Release:      16.04
  Codename:     xenial

  # apt list --installed *zfs*
  Listing... Done
  libzfs2linux/xenial-updates,now 0.6.5.6-0ubuntu16 amd64 [installed,automatic]
  zfs-doc/xenial-updates,xenial-updates,now 0.6.5.6-0ubuntu16 all 
[installed,automatic]
  zfs-zed/xenial-updates,now 0.6.5.6-0ubuntu16 amd64 [installed,automatic]
  zfsutils-linux/xenial-updates,now 0.6.5.6-0ubuntu16 amd64 [installed]

  # apt list --installed *zpool*
  Listing... Done
  libzpool2linux/xenial-updates,now 0.6.5.6-0ubuntu16 amd64 
[installed,automatic]

  # dmesg (including only pertinent details from log)
  [    0.000000] Linux version 4.8.0-44-generic (buildd@lgw01-17) (gcc version 
5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #47~16.04.1-Ubuntu SMP Wed Mar 
22 18:51:56 UTC 2017 (Ubuntu 4.8.0-44.47~16.04.1-generic 4.8.17)
  [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.8.0-44-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ...
  [   91.074536] zavl: loading out-of-tree module taints kernel.
  [   91.074539] zavl: module license 'CDDL' taints kernel.
  [   91.074540] Disabling lock debugging due to kernel taint
  [   91.080838] SPL: Loaded module v0.6.5.8-2
  [   91.175983] ZFS: Loaded module v0.6.5.8-0ubuntu4.1, ZFS pool version 5000, 
ZFS filesystem version 5
  [   96.024363] SPL: using hostid 0x00000000
  [  133.166828] systemd[1]: apt-daily.timer: Adding 8h 8min 39.445565s random 
time.
  [  133.350355] systemd[1]: apt-daily.timer: Adding 7h 8min 13.915790s random 
time.
  [  484.419820] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [  484.419828]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [  484.419831] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  484.419833] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [  484.419842]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [  484.419846]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [  484.419850]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [  484.419854] Call Trace:
  [  484.419869]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [  484.419879]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [  484.419888]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [  484.419892]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [  484.419996]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [  484.420002]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [  484.420007]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [  484.420009]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [  484.420012]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [  484.420014]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [  484.420019]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [  484.420021]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [  484.420023]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [  484.420026]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [  484.420029]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [  484.420032]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [  484.420035]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [  484.420038]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [  484.420043]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [  605.256081] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [  605.256094]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [  605.256095] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  605.256099] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [  605.256113]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [  605.256116]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [  605.256118]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [  605.256121] Call Trace:
  [  605.256145]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [  605.256170]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [  605.256179]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [  605.256184]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [  605.256401]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [  605.256404]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [  605.256407]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [  605.256408]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [  605.256410]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [  605.256411]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [  605.256414]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [  605.256415]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [  605.256416]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [  605.256417]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [  605.256420]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [  605.256421]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [  605.256423]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [  605.256424]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [  605.256427]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [  726.091707] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [  726.091716]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [  726.091718] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  726.091721] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [  726.091729]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [  726.091733]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [  726.091737]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [  726.091741] Call Trace:
  [  726.091756]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [  726.091767]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [  726.091775]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [  726.091779]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [  726.091887]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [  726.091893]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [  726.091898]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [  726.091900]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [  726.091902]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [  726.091905]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [  726.091910]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [  726.091912]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [  726.091914]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [  726.091916]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [  726.091920]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [  726.091923]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [  726.091926]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [  726.091929]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [  726.091934]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [  846.927188] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [  846.927196]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [  846.927198] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  846.927200] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [  846.927210]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [  846.927215]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [  846.927219]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [  846.927222] Call Trace:
  [  846.927236]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [  846.927245]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [  846.927252]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [  846.927255]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [  846.927340]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [  846.927345]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [  846.927349]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [  846.927351]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [  846.927354]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [  846.927356]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [  846.927360]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [  846.927362]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [  846.927365]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [  846.927367]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [  846.927370]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [  846.927373]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [  846.927376]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [  846.927378]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [  846.927383]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [  967.762549] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [  967.762558]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [  967.762560] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  967.762563] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [  967.762572]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [  967.762576]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [  967.762579]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [  967.762583] Call Trace:
  [  967.762598]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [  967.762609]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [  967.762617]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [  967.762621]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [  967.762730]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [  967.762735]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [  967.762740]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [  967.762742]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [  967.762745]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [  967.762747]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [  967.762752]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [  967.762754]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [  967.762756]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [  967.762759]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [  967.762762]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [  967.762765]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [  967.762769]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [  967.762772]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [  967.762776]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [ 1088.597403] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [ 1088.597411]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [ 1088.597413] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1088.597415] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [ 1088.597422]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [ 1088.597426]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [ 1088.597429]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [ 1088.597433] Call Trace:
  [ 1088.597444]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [ 1088.597452]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [ 1088.597458]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [ 1088.597461]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [ 1088.597539]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [ 1088.597543]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [ 1088.597547]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [ 1088.597550]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [ 1088.597552]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [ 1088.597554]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [ 1088.597558]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [ 1088.597560]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [ 1088.597562]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [ 1088.597564]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [ 1088.597567]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [ 1088.597570]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [ 1088.597573]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [ 1088.597576]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [ 1088.597580]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [ 1209.431709] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [ 1209.431717]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [ 1209.431719] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1209.431722] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [ 1209.431731]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [ 1209.431735]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [ 1209.431738]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [ 1209.431742] Call Trace:
  [ 1209.431757]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [ 1209.431769]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [ 1209.431776]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [ 1209.431780]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [ 1209.431865]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [ 1209.431870]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [ 1209.431875]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [ 1209.431877]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [ 1209.431880]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [ 1209.431882]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [ 1209.431887]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [ 1209.431889]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [ 1209.431891]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [ 1209.431893]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [ 1209.431897]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [ 1209.431900]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [ 1209.431903]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [ 1209.431906]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [ 1209.431911]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [ 1330.266331] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [ 1330.266339]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [ 1330.266341] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1330.266344] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [ 1330.266352]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [ 1330.266357]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [ 1330.266360]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [ 1330.266364] Call Trace:
  [ 1330.266379]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [ 1330.266390]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [ 1330.266398]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [ 1330.266402]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [ 1330.266507]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [ 1330.266512]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [ 1330.266517]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [ 1330.266520]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [ 1330.266522]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [ 1330.266524]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [ 1330.266529]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [ 1330.266531]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [ 1330.266534]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [ 1330.266536]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [ 1330.266540]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [ 1330.266542]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [ 1330.266546]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [ 1330.266549]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [ 1330.266554]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [ 1451.101073] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [ 1451.101080]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [ 1451.101081] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1451.101083] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [ 1451.101088]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [ 1451.101090]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [ 1451.101093]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [ 1451.101095] Call Trace:
  [ 1451.101108]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [ 1451.101115]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [ 1451.101120]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [ 1451.101122]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [ 1451.101179]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [ 1451.101182]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [ 1451.101184]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [ 1451.101186]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [ 1451.101187]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [ 1451.101188]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [ 1451.101192]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [ 1451.101193]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [ 1451.101194]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [ 1451.101195]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [ 1451.101197]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [ 1451.101198]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [ 1451.101200]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [ 1451.101202]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [ 1451.101204]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8
  [ 1571.940255] INFO: task updatedb.mlocat:18877 blocked for more than 120 
seconds.
  [ 1571.940272]       Tainted: P           O    4.8.0-44-generic 
#47~16.04.1-Ubuntu
  [ 1571.940273] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1571.940278] updatedb.mlocat D ffff90c3341b7aa0     0 18877  18876 
0x00000000
  [ 1571.940299]  ffff90c3341b7aa0 ffff90c33357a800 ffff90d3393dac40 
ffff90c335303b00
  [ 1571.940304]  0000000000000000 ffff90c3341b8000 ffff90d2ed964a18 
ffffffffa23ec8d0
  [ 1571.940307]  ffff90c335303b00 ffff90c33784e180 ffff90c3341b7ab8 
ffffffffa1a95fb5
  [ 1571.940313] Call Trace:
  [ 1571.940337]  [<ffffffffa1a95fb5>] schedule+0x35/0x80
  [ 1571.940356]  [<ffffffffa144e3ca>] d_alloc_parallel+0x3ca/0x4a0
  [ 1571.940372]  [<ffffffffa12aeff0>] ? wake_up_q+0x70/0x70
  [ 1571.940375]  [<ffffffffa144e6d0>] d_add_ci+0x60/0xe0
  [ 1571.940571]  [<ffffffffc09ed159>] zpl_lookup+0x159/0x1e0 [zfs]
  [ 1571.940579]  [<ffffffffa14561a2>] ? legitimize_mnt+0x12/0x60
  [ 1571.940590]  [<ffffffffa143f6d5>] lookup_slow+0xa5/0x160
  [ 1571.940592]  [<ffffffffa143fe0c>] walk_component+0x1ec/0x310
  [ 1571.940594]  [<ffffffffa1440eed>] path_lookupat+0x5d/0x110
  [ 1571.940596]  [<ffffffffa14438a1>] filename_lookup+0xb1/0x180
  [ 1571.940602]  [<ffffffffa140ab3e>] ? kmem_cache_alloc+0x16e/0x1b0
  [ 1571.940603]  [<ffffffffa14434a6>] ? getname_flags+0x56/0x1f0
  [ 1571.940605]  [<ffffffffa14434c2>] ? getname_flags+0x72/0x1f0
  [ 1571.940607]  [<ffffffffa1443a46>] user_path_at_empty+0x36/0x40
  [ 1571.940611]  [<ffffffffa1438276>] vfs_fstatat+0x66/0xc0
  [ 1571.940613]  [<ffffffffa1438831>] SYSC_newlstat+0x31/0x60
  [ 1571.940616]  [<ffffffffa144a221>] ? SyS_poll+0x71/0x130
  [ 1571.940619]  [<ffffffffa143896e>] SyS_newlstat+0xe/0x10
  [ 1571.940625]  [<ffffffffa1a9a7f6>] entry_SYSCALL_64_fastpath+0x1e/0xa8

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: libzfs2linux 0.6.5.6-0ubuntu16
  ProcVersionSignature: Ubuntu 4.8.0-44.47~16.04.1-generic 4.8.17
  Uname: Linux 4.8.0-44-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Tue Mar 28 17:41:11 2017
  InstallationDate: Installed on 2017-03-29 (0 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 
(20170215.2)
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: zfs-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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