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zfs list stuck after importing a damaged file-backed pool #10223

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jiridanek opened this issue Apr 17, 2020 · 1 comment
Closed

zfs list stuck after importing a damaged file-backed pool #10223

jiridanek opened this issue Apr 17, 2020 · 1 comment
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Status: Stale No recent activity for issue

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@jiridanek
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System information

Type Version/Name
Distribution Name Ubuntu
Distribution Version 20.04 Daily from 2020-04-16
Linux Kernel Linux ubuntu 5.4.0-24-generic #28-Ubuntu SMP Thu Apr 9 22:16:42 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Architecture x86_64
ZFS Version 0.8.3-1ubuntu11
SPL Version 0.8.3-1ubuntu11
zfs --version zfs-0.8.3-1ubuntu12
zfs-kmod-0.8.3-1ubuntu11

Describe the problem you're observing

I wanted to replicate the scenario described in https://jrs-s.net/2016/05/02/zfs-copies-equals-n/. My thinking is that although --copies=2 does not guarantee each copy will be on a separate disk, and neither that the metadata will be spread out, it should be possible to recover something even if a drive fails. I built the zfs pool using files, not loop-mounted devices.

I booted computer from Ubuntu 20.04 Daily 2020-04-16 installation iso, loaded onto USB disk.

When I issued zfs import to import my damaged pool, the command froze, all other zfs or zpool commands (except for trivial ones like --version) would also freeze, and system reboot also froze, requiring me to reboot using SysRq shortcut.

I tried again after reboot and also got the same result, that is handing zpool import and zfs commands hanging too. The dmesg messages were also similar.

When this happened for the first time, I had another pool mounted. It looked unafected (I could ls the mounted files just fine). I was afraid to touch it more, so I umounted it quickly.

Describe how to reproduce the problem

Create the pool

ubuntu@ubuntu:~$ for i in {1..2}; do dd if=/dev/zero of=/tmp/file$i bs=512M count=1 &> /dev/null; done
ubuntu@ubuntu:~$ sudo -i
root@ubuntu:~# zpool create test /tmp/file1 /tmp/file2
root@ubuntu:~# zpool status test
  pool: test
 state: ONLINE
  scan: none requested
config:

    NAME          STATE     READ WRITE CKSUM
    test          ONLINE       0     0     0
      /tmp/file1  ONLINE       0     0     0
      /tmp/file2  ONLINE       0     0     0

errors: No known data errors

Put two files on it

root@ubuntu:~# dd if=/dev/urandom bs=4M count=1 of=/test/test2
1+0 records in
1+0 records out
4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.030847 s, 136 MB/s
root@ubuntu:~# dd if=/dev/urandom bs=4M count=1 of=/test/test1
1+0 records in
1+0 records out
4194304 bytes (4.2 MB, 4.0 MiB) copied, 0.0301516 s, 139 MB/s
root@ubuntu:~# ls /test
test1  test2

Check I can export and reimport

root@ubuntu:~# zpool export test
root@ubuntu:~# zpool import -d /tmp test

First test, export the pool, and overwrite one of the backing files. Then reimport. Test passed.

root@ubuntu:~# zpool export test
root@ubuntu:~# dd if=/dev/zero of=/tmp/file2 bs=512M count=1 &> /dev/null
root@ubuntu:~# zpool import -d /tmp test
root@ubuntu:~# ls /test
test1  test2
root@ubuntu:~# zpool status
  pool: test
 state: ONLINE
  scan: none requested
config:

    NAME          STATE     READ WRITE CKSUM
    test          ONLINE       0     0     0
      /tmp/file1  ONLINE       0     0     0
      /tmp/file2  ONLINE       0     0     0

errors: No known data errors

Second test, export the pool and delete one of the files. Expected result is that I can no longer import. Test passed.

root@ubuntu:~# zpool export test
root@ubuntu:~# ls /test
ls: cannot access '/test': No such file or directory
root@ubuntu:~# rm /tmp/file2
root@ubuntu:~# zpool import -d /tmp test
cannot import 'test': no such pool or dataset
    Destroy and re-create the pool from
    a backup source.
root@ubuntu:~# zpool import -d /tmp
   pool: test
     id: 4376589746374121437
  state: UNAVAIL
 status: One or more devices are missing from the system.
 action: The pool cannot be imported. Attach the missing
    devices and try again.
   see: http://zfsonlinux.org/msg/ZFS-8000-3C
 config:

    test          UNAVAIL  insufficient replicas
      /tmp/file1  ONLINE
      /tmp/file2  UNAVAIL  cannot open

Now, replace the missing file with a blank file. I now expect that this will import ok, and, if I am lucky, one or both files will be restored from undamaged copy. The zpool import hangs.

root@ubuntu:~# dd if=/dev/zero of=/tmp/file2 bs=512M count=1 &> /dev/null
root@ubuntu:~# zpool import -d /tmp test

Include any warning/errors/backtraces from the system logs

dmesg output

[  983.310020] WARNING: Pool 'test' has encountered an uncorrectable I/O failure and has been suspended.
[ 1209.030001] INFO: task zed:2413 blocked for more than 120 seconds.
[ 1209.030011]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 1209.030015] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1209.030019] zed             D    0  2413      1 0x00000000
[ 1209.030025] Call Trace:
[ 1209.030040]  __schedule+0x2e3/0x740
[ 1209.030050]  schedule+0x42/0xb0
[ 1209.030056]  schedule_preempt_disabled+0xe/0x10
[ 1209.030060]  __mutex_lock.isra.0+0x182/0x4f0
[ 1209.030068]  __mutex_lock_slowpath+0x13/0x20
[ 1209.030072]  mutex_lock+0x2e/0x40
[ 1209.030302]  spa_all_configs+0x41/0x120 [zfs]
[ 1209.030518]  zfs_ioc_pool_configs+0x1c/0x70 [zfs]
[ 1209.030722]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 1209.030729]  do_vfs_ioctl+0x407/0x670
[ 1209.030736]  ? do_user_addr_fault+0x216/0x450
[ 1209.030740]  ? do_futex+0x160/0x1e0
[ 1209.030745]  ksys_ioctl+0x67/0x90
[ 1209.030749]  __x64_sys_ioctl+0x1a/0x20
[ 1209.030755]  do_syscall_64+0x57/0x190
[ 1209.030762]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 1209.030766] RIP: 0033:0x7f9c32f9437b
[ 1209.030777] Code: Bad RIP value.
[ 1209.030779] RSP: 002b:00007f9c321c6628 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 1209.030784] RAX: ffffffffffffffda RBX: 0000560c5ad39a40 RCX: 00007f9c32f9437b
[ 1209.030787] RDX: 00007f9c321c6650 RSI: 0000000000005a04 RDI: 000000000000000b
[ 1209.030789] RBP: 00007f9c321c9c30 R08: 00007f9c24000d00 R09: 000000000000007d
[ 1209.030791] R10: 00007f9c32f29c10 R11: 0000000000000246 R12: 0000560c5ad39a40
[ 1209.030793] R13: 0000000000000000 R14: 00007f9c321c6650 R15: 0000000000000000
[ 1209.030931] INFO: task zpool:9329 blocked for more than 120 seconds.
[ 1209.030937]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 1209.030940] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1209.030943] zpool           D    0  9329   7861 0x80004006
[ 1209.030947] Call Trace:
[ 1209.030953]  __schedule+0x2e3/0x740
[ 1209.030959]  schedule+0x42/0xb0
[ 1209.030963]  io_schedule+0x16/0x40
[ 1209.030984]  cv_wait_common+0xdc/0x180 [spl]
[ 1209.030990]  ? wait_woken+0x80/0x80
[ 1209.031008]  __cv_wait_io+0x18/0x20 [spl]
[ 1209.031210]  txg_wait_synced_impl+0xd7/0x120 [zfs]
[ 1209.031404]  txg_wait_synced+0x10/0x40 [zfs]
[ 1209.031593]  spa_config_update+0x132/0x170 [zfs]
[ 1209.031782]  spa_import+0x594/0x7c0 [zfs]
[ 1209.031801]  ? nvpair_value_common+0xde/0x160 [znvpair]
[ 1209.032002]  zfs_ioc_pool_import+0x138/0x150 [zfs]
[ 1209.032204]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 1209.032210]  do_vfs_ioctl+0x407/0x670
[ 1209.032216]  ? do_user_addr_fault+0x216/0x450
[ 1209.032221]  ksys_ioctl+0x67/0x90
[ 1209.032226]  __x64_sys_ioctl+0x1a/0x20
[ 1209.032231]  do_syscall_64+0x57/0x190
[ 1209.032237]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 1209.032240] RIP: 0033:0x7fc79b5b437b
[ 1209.032246] Code: Bad RIP value.
[ 1209.032249] RSP: 002b:00007ffc3fd84ff8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 1209.032252] RAX: ffffffffffffffda RBX: 00007ffc3fd8bcf0 RCX: 00007fc79b5b437b
[ 1209.032255] RDX: 00007ffc3fd88640 RSI: 0000000000005a02 RDI: 0000000000000003
[ 1209.032257] RBP: 00007ffc3fd885c0 R08: 0000000000005a02 R09: 0000000000000003
[ 1209.032259] R10: 000055a3d0416010 R11: 0000000000000246 R12: 00007ffc3fd88640
[ 1209.032261] R13: 00007ffc3fd88640 R14: 00007fc794000e80 R15: 0000000000000000
[ 1209.032293] INFO: task txg_sync:9534 blocked for more than 120 seconds.
[ 1209.032297]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 1209.032300] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 1209.032303] txg_sync        D    0  9534      2 0x80004000
[ 1209.032307] Call Trace:
[ 1209.032312]  __schedule+0x2e3/0x740
[ 1209.032317]  schedule+0x42/0xb0
[ 1209.032337]  cv_wait_common+0x133/0x180 [spl]
[ 1209.032342]  ? wait_woken+0x80/0x80
[ 1209.032359]  __cv_wait+0x15/0x20 [spl]
[ 1209.032580]  zio_resume_wait+0x45/0x90 [zfs]
[ 1209.032776]  spa_sync_rewrite_vdev_config.isra.0+0xef/0x1f0 [zfs]
[ 1209.032974]  spa_sync+0x31f/0x5b0 [zfs]
[ 1209.033175]  txg_sync_thread+0x27a/0x310 [zfs]
[ 1209.033378]  ? txg_dispatch_callbacks+0x100/0x100 [zfs]
[ 1209.033401]  thread_generic_wrapper+0x83/0xa0 [spl]
[ 1209.033406]  kthread+0x104/0x140
[ 1209.033427]  ? clear_bit+0x20/0x20 [spl]
[ 1209.033431]  ? kthread_park+0x90/0x90
[ 1209.033436]  ret_from_fork+0x22/0x40

another dmesg, when I encountered issue first time

[ 9526.211039] WARNING: Pool 'test' has encountered an uncorrectable I/O failure and has been suspended.

[ 9667.922981] INFO: task zed:2384 blocked for more than 120 seconds.
[ 9667.922991]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9667.922995] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9667.923000] zed             D    0  2384      1 0x00004000
[ 9667.923006] Call Trace:
[ 9667.923021]  __schedule+0x2e3/0x740
[ 9667.923030]  schedule+0x42/0xb0
[ 9667.923036]  schedule_preempt_disabled+0xe/0x10
[ 9667.923041]  __mutex_lock.isra.0+0x182/0x4f0
[ 9667.923049]  __mutex_lock_slowpath+0x13/0x20
[ 9667.923053]  mutex_lock+0x2e/0x40
[ 9667.923287]  spa_all_configs+0x41/0x120 [zfs]
[ 9667.923503]  zfs_ioc_pool_configs+0x1c/0x70 [zfs]
[ 9667.923706]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9667.923714]  do_vfs_ioctl+0x407/0x670
[ 9667.923721]  ? do_user_addr_fault+0x216/0x450
[ 9667.923726]  ? do_futex+0x160/0x1e0
[ 9667.923730]  ksys_ioctl+0x67/0x90
[ 9667.923735]  __x64_sys_ioctl+0x1a/0x20
[ 9667.923741]  do_syscall_64+0x57/0x190
[ 9667.923747]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9667.923752] RIP: 0033:0x7f382587737b
[ 9667.923762] Code: Bad RIP value.
[ 9667.923764] RSP: 002b:00007f3824aa9628 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9667.923769] RAX: ffffffffffffffda RBX: 0000564adb365a40 RCX: 00007f382587737b
[ 9667.923772] RDX: 00007f3824aa9650 RSI: 0000000000005a04 RDI: 000000000000000b
[ 9667.923774] RBP: 00007f3824aacc30 R08: 00007f3818041010 R09: 00007f3818000470
[ 9667.923776] R10: 00007f38180008d0 R11: 0000000000000246 R12: 0000564adb365a40
[ 9667.923778] R13: 0000000000000000 R14: 00007f3824aa9650 R15: 0000000000000000
[ 9667.924011] INFO: task zpool:1077538 blocked for more than 120 seconds.
[ 9667.924017]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9667.924020] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9667.924023] zpool           D    0 1077538  61756 0x80004002
[ 9667.924028] Call Trace:
[ 9667.924034]  __schedule+0x2e3/0x740
[ 9667.924039]  schedule+0x42/0xb0
[ 9667.924043]  io_schedule+0x16/0x40
[ 9667.924065]  cv_wait_common+0xdc/0x180 [spl]
[ 9667.924071]  ? wait_woken+0x80/0x80
[ 9667.924089]  __cv_wait_io+0x18/0x20 [spl]
[ 9667.924293]  txg_wait_synced_impl+0xd7/0x120 [zfs]
[ 9667.924486]  txg_wait_synced+0x10/0x40 [zfs]
[ 9667.924675]  spa_config_update+0x132/0x170 [zfs]
[ 9667.924864]  spa_import+0x594/0x7c0 [zfs]
[ 9667.924882]  ? nvpair_value_common+0xde/0x160 [znvpair]
[ 9667.925083]  zfs_ioc_pool_import+0x138/0x150 [zfs]
[ 9667.925284]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9667.925291]  do_vfs_ioctl+0x407/0x670
[ 9667.925298]  ? do_user_addr_fault+0x216/0x450
[ 9667.925302]  ksys_ioctl+0x67/0x90
[ 9667.925307]  __x64_sys_ioctl+0x1a/0x20
[ 9667.925312]  do_syscall_64+0x57/0x190
[ 9667.925318]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9667.925322] RIP: 0033:0x7f56980c137b
[ 9667.925328] Code: Bad RIP value.
[ 9667.925330] RSP: 002b:00007ffd3b824d48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9667.925334] RAX: ffffffffffffffda RBX: 00007ffd3b82ba40 RCX: 00007f56980c137b
[ 9667.925336] RDX: 00007ffd3b828390 RSI: 0000000000005a02 RDI: 0000000000000003
[ 9667.925338] RBP: 00007ffd3b828310 R08: 0000000000005a02 R09: 0000000000000003
[ 9667.925341] R10: 00005631f359b010 R11: 0000000000000246 R12: 00007ffd3b828390
[ 9667.925343] R13: 00007ffd3b828390 R14: 00007f5684000e80 R15: 0000000000000000
[ 9667.925373] INFO: task txg_sync:1077741 blocked for more than 120 seconds.
[ 9667.925378]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9667.925381] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9667.925384] txg_sync        D    0 1077741      2 0x80004000
[ 9667.925388] Call Trace:
[ 9667.925393]  __schedule+0x2e3/0x740
[ 9667.925398]  schedule+0x42/0xb0
[ 9667.925417]  cv_wait_common+0x133/0x180 [spl]
[ 9667.925422]  ? wait_woken+0x80/0x80
[ 9667.925440]  __cv_wait+0x15/0x20 [spl]
[ 9667.925660]  zio_resume_wait+0x45/0x90 [zfs]
[ 9667.925857]  spa_sync_rewrite_vdev_config.isra.0+0xef/0x1f0 [zfs]
[ 9667.926053]  spa_sync+0x31f/0x5b0 [zfs]
[ 9667.926255]  txg_sync_thread+0x27a/0x310 [zfs]
[ 9667.926457]  ? txg_dispatch_callbacks+0x100/0x100 [zfs]
[ 9667.926479]  thread_generic_wrapper+0x83/0xa0 [spl]
[ 9667.926485]  kthread+0x104/0x140
[ 9667.926506]  ? clear_bit+0x20/0x20 [spl]
[ 9667.926510]  ? kthread_park+0x90/0x90
[ 9667.926515]  ret_from_fork+0x22/0x40
[ 9788.763370] INFO: task zed:2384 blocked for more than 241 seconds.
[ 9788.763381]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9788.763384] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9788.763389] zed             D    0  2384      1 0x00004000
[ 9788.763395] Call Trace:
[ 9788.763411]  __schedule+0x2e3/0x740
[ 9788.763420]  schedule+0x42/0xb0
[ 9788.763426]  schedule_preempt_disabled+0xe/0x10
[ 9788.763431]  __mutex_lock.isra.0+0x182/0x4f0
[ 9788.763439]  __mutex_lock_slowpath+0x13/0x20
[ 9788.763443]  mutex_lock+0x2e/0x40
[ 9788.763675]  spa_all_configs+0x41/0x120 [zfs]
[ 9788.763891]  zfs_ioc_pool_configs+0x1c/0x70 [zfs]
[ 9788.764094]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9788.764102]  do_vfs_ioctl+0x407/0x670
[ 9788.764110]  ? do_user_addr_fault+0x216/0x450
[ 9788.764114]  ? do_futex+0x160/0x1e0
[ 9788.764119]  ksys_ioctl+0x67/0x90
[ 9788.764123]  __x64_sys_ioctl+0x1a/0x20
[ 9788.764129]  do_syscall_64+0x57/0x190
[ 9788.764136]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9788.764140] RIP: 0033:0x7f382587737b
[ 9788.764150] Code: Bad RIP value.
[ 9788.764153] RSP: 002b:00007f3824aa9628 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9788.764158] RAX: ffffffffffffffda RBX: 0000564adb365a40 RCX: 00007f382587737b
[ 9788.764160] RDX: 00007f3824aa9650 RSI: 0000000000005a04 RDI: 000000000000000b
[ 9788.764162] RBP: 00007f3824aacc30 R08: 00007f3818041010 R09: 00007f3818000470
[ 9788.764165] R10: 00007f38180008d0 R11: 0000000000000246 R12: 0000564adb365a40
[ 9788.764167] R13: 0000000000000000 R14: 00007f3824aa9650 R15: 0000000000000000
[ 9788.764406] INFO: task zpool:1077538 blocked for more than 241 seconds.
[ 9788.764412]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9788.764415] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9788.764419] zpool           D    0 1077538  61756 0x80004006
[ 9788.764423] Call Trace:
[ 9788.764428]  __schedule+0x2e3/0x740
[ 9788.764434]  schedule+0x42/0xb0
[ 9788.764438]  io_schedule+0x16/0x40
[ 9788.764460]  cv_wait_common+0xdc/0x180 [spl]
[ 9788.764466]  ? wait_woken+0x80/0x80
[ 9788.764484]  __cv_wait_io+0x18/0x20 [spl]
[ 9788.764692]  txg_wait_synced_impl+0xd7/0x120 [zfs]
[ 9788.764885]  txg_wait_synced+0x10/0x40 [zfs]
[ 9788.765075]  spa_config_update+0x132/0x170 [zfs]
[ 9788.765264]  spa_import+0x594/0x7c0 [zfs]
[ 9788.765282]  ? nvpair_value_common+0xde/0x160 [znvpair]
[ 9788.765483]  zfs_ioc_pool_import+0x138/0x150 [zfs]
[ 9788.765684]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9788.765690]  do_vfs_ioctl+0x407/0x670
[ 9788.765697]  ? do_user_addr_fault+0x216/0x450
[ 9788.765701]  ksys_ioctl+0x67/0x90
[ 9788.765706]  __x64_sys_ioctl+0x1a/0x20
[ 9788.765711]  do_syscall_64+0x57/0x190
[ 9788.765717]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9788.765721] RIP: 0033:0x7f56980c137b
[ 9788.765726] Code: Bad RIP value.
[ 9788.765729] RSP: 002b:00007ffd3b824d48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9788.765732] RAX: ffffffffffffffda RBX: 00007ffd3b82ba40 RCX: 00007f56980c137b
[ 9788.765735] RDX: 00007ffd3b828390 RSI: 0000000000005a02 RDI: 0000000000000003
[ 9788.765737] RBP: 00007ffd3b828310 R08: 0000000000005a02 R09: 0000000000000003
[ 9788.765739] R10: 00005631f359b010 R11: 0000000000000246 R12: 00007ffd3b828390
[ 9788.765741] R13: 00007ffd3b828390 R14: 00007f5684000e80 R15: 0000000000000000
[ 9788.765773] INFO: task txg_sync:1077741 blocked for more than 241 seconds.
[ 9788.765778]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9788.765781] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9788.765785] txg_sync        D    0 1077741      2 0x80004000
[ 9788.765789] Call Trace:
[ 9788.765794]  __schedule+0x2e3/0x740
[ 9788.765799]  schedule+0x42/0xb0
[ 9788.765818]  cv_wait_common+0x133/0x180 [spl]
[ 9788.765823]  ? wait_woken+0x80/0x80
[ 9788.765840]  __cv_wait+0x15/0x20 [spl]
[ 9788.766062]  zio_resume_wait+0x45/0x90 [zfs]
[ 9788.766258]  spa_sync_rewrite_vdev_config.isra.0+0xef/0x1f0 [zfs]
[ 9788.766454]  spa_sync+0x31f/0x5b0 [zfs]
[ 9788.766656]  txg_sync_thread+0x27a/0x310 [zfs]
[ 9788.766858]  ? txg_dispatch_callbacks+0x100/0x100 [zfs]
[ 9788.766881]  thread_generic_wrapper+0x83/0xa0 [spl]
[ 9788.766886]  kthread+0x104/0x140
[ 9788.766907]  ? clear_bit+0x20/0x20 [spl]
[ 9788.766911]  ? kthread_park+0x90/0x90
[ 9788.766917]  ret_from_fork+0x22/0x40
[ 9909.595686] INFO: task zed:2384 blocked for more than 362 seconds.
[ 9909.595698]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9909.595701] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9909.595706] zed             D    0  2384      1 0x00004000
[ 9909.595713] Call Trace:
[ 9909.595729]  __schedule+0x2e3/0x740
[ 9909.595739]  schedule+0x42/0xb0
[ 9909.595745]  schedule_preempt_disabled+0xe/0x10
[ 9909.595749]  __mutex_lock.isra.0+0x182/0x4f0
[ 9909.595757]  __mutex_lock_slowpath+0x13/0x20
[ 9909.595761]  mutex_lock+0x2e/0x40
[ 9909.595998]  spa_all_configs+0x41/0x120 [zfs]
[ 9909.596213]  zfs_ioc_pool_configs+0x1c/0x70 [zfs]
[ 9909.596417]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9909.596424]  do_vfs_ioctl+0x407/0x670
[ 9909.596432]  ? do_user_addr_fault+0x216/0x450
[ 9909.596436]  ? do_futex+0x160/0x1e0
[ 9909.596441]  ksys_ioctl+0x67/0x90
[ 9909.596446]  __x64_sys_ioctl+0x1a/0x20
[ 9909.596452]  do_syscall_64+0x57/0x190
[ 9909.596458]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9909.596463] RIP: 0033:0x7f382587737b
[ 9909.596473] Code: Bad RIP value.
[ 9909.596476] RSP: 002b:00007f3824aa9628 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9909.596480] RAX: ffffffffffffffda RBX: 0000564adb365a40 RCX: 00007f382587737b
[ 9909.596483] RDX: 00007f3824aa9650 RSI: 0000000000005a04 RDI: 000000000000000b
[ 9909.596485] RBP: 00007f3824aacc30 R08: 00007f3818041010 R09: 00007f3818000470
[ 9909.596488] R10: 00007f38180008d0 R11: 0000000000000246 R12: 0000564adb365a40
[ 9909.596490] R13: 0000000000000000 R14: 00007f3824aa9650 R15: 0000000000000000
[ 9909.596733] INFO: task zpool:1077538 blocked for more than 362 seconds.
[ 9909.596739]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9909.596742] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9909.596746] zpool           D    0 1077538  61756 0x80004006
[ 9909.596750] Call Trace:
[ 9909.596755]  __schedule+0x2e3/0x740
[ 9909.596760]  schedule+0x42/0xb0
[ 9909.596764]  io_schedule+0x16/0x40
[ 9909.596789]  cv_wait_common+0xdc/0x180 [spl]
[ 9909.596795]  ? wait_woken+0x80/0x80
[ 9909.596813]  __cv_wait_io+0x18/0x20 [spl]
[ 9909.597021]  txg_wait_synced_impl+0xd7/0x120 [zfs]
[ 9909.597215]  txg_wait_synced+0x10/0x40 [zfs]
[ 9909.597404]  spa_config_update+0x132/0x170 [zfs]
[ 9909.597593]  spa_import+0x594/0x7c0 [zfs]
[ 9909.597615]  ? nvpair_value_common+0xde/0x160 [znvpair]
[ 9909.597817]  zfs_ioc_pool_import+0x138/0x150 [zfs]
[ 9909.598018]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9909.598024]  do_vfs_ioctl+0x407/0x670
[ 9909.598031]  ? do_user_addr_fault+0x216/0x450
[ 9909.598035]  ksys_ioctl+0x67/0x90
[ 9909.598040]  __x64_sys_ioctl+0x1a/0x20
[ 9909.598046]  do_syscall_64+0x57/0x190
[ 9909.598052]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9909.598055] RIP: 0033:0x7f56980c137b
[ 9909.598061] Code: Bad RIP value.
[ 9909.598063] RSP: 002b:00007ffd3b824d48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9909.598067] RAX: ffffffffffffffda RBX: 00007ffd3b82ba40 RCX: 00007f56980c137b
[ 9909.598069] RDX: 00007ffd3b828390 RSI: 0000000000005a02 RDI: 0000000000000003
[ 9909.598071] RBP: 00007ffd3b828310 R08: 0000000000005a02 R09: 0000000000000003
[ 9909.598074] R10: 00005631f359b010 R11: 0000000000000246 R12: 00007ffd3b828390
[ 9909.598076] R13: 00007ffd3b828390 R14: 00007f5684000e80 R15: 0000000000000000
[ 9909.598107] INFO: task txg_sync:1077741 blocked for more than 362 seconds.
[ 9909.598112]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9909.598114] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9909.598118] txg_sync        D    0 1077741      2 0x80004000
[ 9909.598121] Call Trace:
[ 9909.598127]  __schedule+0x2e3/0x740
[ 9909.598132]  schedule+0x42/0xb0
[ 9909.598151]  cv_wait_common+0x133/0x180 [spl]
[ 9909.598156]  ? wait_woken+0x80/0x80
[ 9909.598173]  __cv_wait+0x15/0x20 [spl]
[ 9909.598387]  zio_resume_wait+0x45/0x90 [zfs]
[ 9909.598575]  spa_sync_rewrite_vdev_config.isra.0+0xef/0x1f0 [zfs]
[ 9909.598764]  spa_sync+0x31f/0x5b0 [zfs]
[ 9909.598957]  txg_sync_thread+0x27a/0x310 [zfs]
[ 9909.599150]  ? txg_dispatch_callbacks+0x100/0x100 [zfs]
[ 9909.599172]  thread_generic_wrapper+0x83/0xa0 [spl]
[ 9909.599177]  kthread+0x104/0x140
[ 9909.599198]  ? clear_bit+0x20/0x20 [spl]
[ 9909.599202]  ? kthread_park+0x90/0x90
[ 9909.599208]  ret_from_fork+0x22/0x40
[ 9909.599235] INFO: task zpool:1077847 blocked for more than 120 seconds.
[ 9909.599240]       Tainted: P           O      5.4.0-24-generic #28-Ubuntu
[ 9909.599243] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 9909.599246] zpool           D    0 1077847   8487 0x00000004
[ 9909.599249] Call Trace:
[ 9909.599255]  __schedule+0x2e3/0x740
[ 9909.599261]  ? prep_new_page+0x128/0x160
[ 9909.599266]  schedule+0x42/0xb0
[ 9909.599271]  schedule_preempt_disabled+0xe/0x10
[ 9909.599275]  __mutex_lock.isra.0+0x182/0x4f0
[ 9909.599282]  __mutex_lock_slowpath+0x13/0x20
[ 9909.599286]  mutex_lock+0x2e/0x40
[ 9909.599486]  spa_all_configs+0x41/0x120 [zfs]
[ 9909.599699]  zfs_ioc_pool_configs+0x1c/0x70 [zfs]
[ 9909.599986]  zfsdev_ioctl+0x5c8/0x690 [zfs]
[ 9909.600006]  do_vfs_ioctl+0x407/0x670
[ 9909.600015]  ? do_user_addr_fault+0x216/0x450
[ 9909.600024]  ksys_ioctl+0x67/0x90
[ 9909.600033]  __x64_sys_ioctl+0x1a/0x20
[ 9909.600042]  do_syscall_64+0x57/0x190
[ 9909.600052]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 9909.600059] RIP: 0033:0x7fa51ef6837b
[ 9909.600069] Code: Bad RIP value.
[ 9909.600074] RSP: 002b:00007ffd5909b118 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9909.600083] RAX: ffffffffffffffda RBX: 000055b33d74f650 RCX: 00007fa51ef6837b
[ 9909.600090] RDX: 00007ffd5909b140 RSI: 0000000000005a04 RDI: 0000000000000003
[ 9909.600096] RBP: 00007ffd5909e720 R08: 00007fa51dcfd010 R09: 0000000000000000
[ 9909.600103] R10: 0000000000000022 R11: 0000000000000246 R12: 000055b33d74f650
[ 9909.600109] R13: 0000000000000000 R14: 00007ffd5909b140 R15: 0000000000000000

restarting zsysd would also hang, here's output when running under strace

root@ubuntu:~# rm /run/zsysd.sock
root@ubuntu:~# strace zsysd -vv
execve("/usr/sbin/zsysd", ["zsysd", "-vv"], 0x7fff2762b318 /* 22 vars */) = 0
brk(NULL)                               = 0x29c5000
arch_prctl(0x3001 /* ARCH_??? */, 0x7ffea835c230) = -1 EINVAL (Invalid argument)
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=66468, ...}) = 0
mmap(NULL, 66468, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f61ba498000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220\201\0\0\0\0\0\0"..., 832) = 832
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0d\326\336\313\342\331\354\353\222\204\r\17\376\320\253\316"..., 68, 824) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=157224, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61ba496000
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0d\326\336\313\342\331\354\353\222\204\r\17\376\320\253\316"..., 68, 824) = 68
mmap(NULL, 140408, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba473000
mmap(0x7f61ba47a000, 69632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x7000) = 0x7f61ba47a000
mmap(0x7f61ba48b000, 20480, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0x7f61ba48b000
mmap(0x7f61ba490000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c000) = 0x7f61ba490000
mmap(0x7f61ba492000, 13432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f61ba492000
close(3)                                = 0
openat(AT_FDCWD, "/lib/libzfs.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \3\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=482616, ...}) = 0
mmap(NULL, 501720, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba3f8000
mmap(0x7f61ba407000, 319488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f61ba407000
mmap(0x7f61ba455000, 90112, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5d000) = 0x7f61ba455000
mmap(0x7f61ba46b000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x72000) = 0x7f61ba46b000
mmap(0x7f61ba46f000, 14296, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f61ba46f000
close(3)                                = 0
openat(AT_FDCWD, "/lib/libnvpair.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0PD\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=88208, ...}) = 0
mmap(NULL, 90200, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba3e1000
mprotect(0x7f61ba3e5000, 69632, PROT_NONE) = 0
mmap(0x7f61ba3e5000, 45056, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x7f61ba3e5000
mmap(0x7f61ba3f0000, 20480, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f61ba3f0000
mmap(0x7f61ba3f6000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0x7f61ba3f6000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360q\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
pread64(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32, 848) = 32
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0q\277\20\32\317\327\337\334\235q\223a\2778y{"..., 68, 880) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=2029224, ...}) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
pread64(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32, 848) = 32
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0q\277\20\32\317\327\337\334\235q\223a\2778y{"..., 68, 880) = 68
mmap(NULL, 2036952, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba1ef000
mprotect(0x7f61ba214000, 1847296, PROT_NONE) = 0
mmap(0x7f61ba214000, 1540096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x25000) = 0x7f61ba214000
mmap(0x7f61ba38c000, 303104, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19d000) = 0x7f61ba38c000
mmap(0x7f61ba3d7000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1e7000) = 0x7f61ba3d7000
mmap(0x7f61ba3dd000, 13528, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f61ba3dd000
close(3)                                = 0
openat(AT_FDCWD, "/lib/libuutil.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20T\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=59880, ...}) = 0
mmap(NULL, 66592, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba1de000
mmap(0x7f61ba1e3000, 24576, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5000) = 0x7f61ba1e3000
mmap(0x7f61ba1e9000, 12288, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb000) = 0x7f61ba1e9000
mmap(0x7f61ba1ec000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xd000) = 0x7f61ba1ec000
mmap(0x7f61ba1ee000, 1056, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f61ba1ee000
close(3)                                = 0
openat(AT_FDCWD, "/lib/libzfs_core.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`%\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=26624, ...}) = 0
mmap(NULL, 28808, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba1d6000
mmap(0x7f61ba1d8000, 12288, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f61ba1d8000
mmap(0x7f61ba1db000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5000) = 0x7f61ba1db000
mmap(0x7f61ba1dc000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5000) = 0x7f61ba1dc000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libblkid.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\266\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=351352, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61ba1d4000
mmap(NULL, 354088, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba17d000
mprotect(0x7f61ba187000, 290816, PROT_NONE) = 0
mmap(0x7f61ba187000, 221184, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7f61ba187000
mmap(0x7f61ba1bd000, 65536, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x40000) = 0x7f61ba1bd000
mmap(0x7f61ba1ce000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x50000) = 0x7f61ba1ce000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\363\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=1369352, ...}) = 0
mmap(NULL, 1368336, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61ba02e000
mmap(0x7f61ba03d000, 684032, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x7f61ba03d000
mmap(0x7f61ba0e4000, 618496, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb6000) = 0x7f61ba0e4000
mmap(0x7f61ba17b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14c000) = 0x7f61ba17b000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libcrypto.so.1.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\220\7\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=2954080, ...}) = 0
mmap(NULL, 2973600, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61b9d58000
mmap(0x7f61b9dd0000, 1683456, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x78000) = 0x7f61b9dd0000
mmap(0x7f61b9f6b000, 593920, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x213000) = 0x7f61b9f6b000
mmap(0x7f61b9ffc000, 188416, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2a3000) = 0x7f61b9ffc000
mmap(0x7f61ba02a000, 16288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f61ba02a000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libudev.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20X\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=174272, ...}) = 0
mmap(NULL, 178440, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61b9d2c000
mmap(0x7f61b9d31000, 110592, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x5000) = 0x7f61b9d31000
mmap(0x7f61b9d4c000, 40960, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x20000) = 0x7f61b9d4c000
mmap(0x7f61b9d56000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x29000) = 0x7f61b9d56000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libuuid.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200%\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=30936, ...}) = 0
mmap(NULL, 32792, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61b9d23000
mmap(0x7f61b9d25000, 16384, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f61b9d25000
mmap(0x7f61b9d29000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f61b9d29000
mmap(0x7f61b9d2a000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f61b9d2a000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\200\"\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=108936, ...}) = 0
mmap(NULL, 110776, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61b9d07000
mprotect(0x7f61b9d09000, 98304, PROT_NONE) = 0
mmap(0x7f61b9d09000, 69632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f61b9d09000
mmap(0x7f61b9d1a000, 24576, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x13000) = 0x7f61b9d1a000
mmap(0x7f61b9d21000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19000) = 0x7f61b9d21000
close(3)                                = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b9d05000
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \22\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=18816, ...}) = 0
mmap(NULL, 20752, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f61b9cff000
mmap(0x7f61b9d00000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7f61b9d00000
mmap(0x7f61b9d02000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f61b9d02000
mmap(0x7f61b9d03000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7f61b9d03000
close(3)                                = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b9cfd000
mmap(NULL, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b9cf8000
arch_prctl(ARCH_SET_FS, 0x7f61b9cfa7c0) = 0
mprotect(0x7f61ba3d7000, 12288, PROT_READ) = 0
mprotect(0x7f61b9d03000, 4096, PROT_READ) = 0
mprotect(0x7f61b9d21000, 4096, PROT_READ) = 0
mprotect(0x7f61b9d2a000, 4096, PROT_READ) = 0
mprotect(0x7f61ba490000, 4096, PROT_READ) = 0
mprotect(0x7f61b9d56000, 4096, PROT_READ) = 0
mprotect(0x7f61b9ffc000, 180224, PROT_READ) = 0
mprotect(0x7f61ba17b000, 4096, PROT_READ) = 0
mprotect(0x7f61ba1ce000, 20480, PROT_READ) = 0
mprotect(0x7f61ba3f6000, 4096, PROT_READ) = 0
mprotect(0x7f61ba1ec000, 4096, PROT_READ) = 0
mprotect(0x7f61ba1dc000, 4096, PROT_READ) = 0
mprotect(0x7f61ba46b000, 8192, PROT_READ) = 0
mprotect(0xfc5000, 4096, PROT_READ)     = 0
mprotect(0x7f61ba4d6000, 4096, PROT_READ) = 0
munmap(0x7f61ba498000, 66468)           = 0
set_tid_address(0x7f61b9cfaa90)         = 1079256
set_robust_list(0x7f61b9cfaaa0, 24)     = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f61ba47abf0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f61ba47ac90, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
brk(NULL)                               = 0x29c5000
brk(0x29e6000)                          = 0x29e6000
sched_getaffinity(0, 8192, [0, 1, 2, 3]) = 8
openat(AT_FDCWD, "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", O_RDONLY) = 3
read(3, "2097152\n", 20)                = 8
close(3)                                = 0
mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b9cb8000
mmap(0xc000000000, 67108864, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xc000000000
mmap(0xc000000000, 67108864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xc000000000
mmap(NULL, 33554432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b7cb8000
mmap(NULL, 2164736, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b7aa7000
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61ba499000
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b7a97000
rt_sigprocmask(SIG_SETMASK, NULL, [], 8) = 0
sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
sigaltstack({ss_sp=0xc000002000, ss_flags=0, ss_size=32768}, NULL) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
gettid()                                = 1079256
rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGHUP, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGQUIT, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGILL, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGTRAP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTRAP, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGABRT, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGBUS, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGFPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGFPE, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGUSR1, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGUSR1, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGSEGV, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSEGV, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGUSR2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGUSR2, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGALRM, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGSTKFLT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSTKFLT, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGCHLD, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGURG, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGURG, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXCPU, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGXFSZ, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXFSZ, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGVTALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGVTALRM, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGPROF, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPROF, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGWINCH, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGWINCH, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGIO, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGPWR, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPWR, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGSYS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSYS, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRTMIN, NULL, {sa_handler=0x7f61ba47abf0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, 8) = 0
rt_sigaction(SIGRTMIN, NULL, {sa_handler=0x7f61ba47abf0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, 8) = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f61ba47abf0, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, NULL, {sa_handler=0x7f61ba47ac90, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, 8) = 0
rt_sigaction(SIGRT_1, NULL, {sa_handler=0x7f61ba47ac90, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f61ba47ac90, sa_mask=[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_2, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_3, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_3, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_4, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_4, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_5, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_5, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_6, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_6, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_7, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_7, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_8, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_8, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_9, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_9, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_10, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_10, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_11, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_11, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_12, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_12, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_13, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_13, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_14, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_14, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_15, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_15, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_16, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_16, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_17, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_17, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_18, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_18, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_19, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_19, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_20, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_20, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_21, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_21, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_22, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_22, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_23, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_23, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_24, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_24, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_25, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_25, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_26, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_26, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_27, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_27, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_28, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_28, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_29, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_29, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_30, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_30, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_31, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_31, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigaction(SIGRT_32, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_32, {sa_handler=0x4684b0, sa_mask=~[RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f61ba4883c0}, NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f61b7296000
mprotect(0x7f61b7297000, 8388608, PROT_READ|PROT_WRITE) = 0
clone(child_stack=0x7f61b7a93f30, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f61b7a969d0, tls=0x7f61b7a96700, child_tidptr=0x7f61b7a969d0) = 1079257
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f61b6a95000
mprotect(0x7f61b6a96000, 8388608, PROT_READ|PROT_WRITE) = 0
clone(child_stack=0x7f61b7292f30, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f61b72959d0, tls=0x7f61b7295700, child_tidptr=0x7f61b72959d0) = 1079258
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
futex(0xc000044848, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xc000044848, FUTEX_WAKE_PRIVATE, 1) = 1
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f61b5292000
mprotect(0x7f61b5293000, 8388608, PROT_READ|PROT_WRITE) = 0
clone(child_stack=0x7f61b5a8ff30, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f61b5a929d0, tls=0x7f61b5a92700, child_tidptr=0x7f61b5a929d0) = 1079261
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
mmap(NULL, 1439992, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b5132000
mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b50f2000
readlinkat(AT_FDCWD, "/proc/self/exe", "/usr/sbin/zsysd", 128) = 15
fcntl(0, F_GETFL)                       = 0x2 (flags O_RDWR)
futex(0xc000044848, FUTEX_WAKE_PRIVATE, 1) = 1
fcntl(1, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(2, F_GETFL)                       = 0x2 (flags O_RDWR)
access("/run/systemd/container", R_OK)  = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/sys/module/zfs/version", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=4096, ...}) = 0
read(3, "0.8.3-1ubuntu11\n", 4096)      = 16
close(3)                                = 0
access("/sys/module/zfs/version", F_OK) = 0
openat(AT_FDCWD, "/dev/zfs", O_RDWR)    = 3
close(3)                                = 0
openat(AT_FDCWD, "/dev/zfs", O_RDWR)    = 3
openat(AT_FDCWD, "/proc/self/mounts", O_RDONLY) = 4
openat(AT_FDCWD, "/etc/dfs/sharetab", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/dev/zfs", O_RDWR)    = 5
stat("/sys/module/zfs/properties.dataset/redundant_metadata", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/sync", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/checksum", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/dedup", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/compression", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/snapdir", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/snapdev", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/acltype", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/aclinherit", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/copies", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/primarycache", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/secondarycache", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/logbias", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/xattr", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/dnodesize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/volmode", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/atime", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/relatime", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/devices", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/exec", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/setuid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/readonly", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/zoned", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/vscan", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/nbmand", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/overlay", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/version", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/canmount", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/mounted", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/defer_destroy", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/keystatus", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/normalization", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/casesensitivity", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/keyformat", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/encryption", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/utf8only", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/origin", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/clones", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/mountpoint", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/sharenfs", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/type", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/sharesmb", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/mlslabel", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/context", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/fscontext", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/defcontext", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/rootcontext", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/receive_resume_token", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/encryptionroot", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/keylocation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/used", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/available", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/referenced", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/compressratio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/refcompressratio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/volblocksize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbysnapshots", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbydataset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbychildren", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbyrefreservation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/userrefs", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/written", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/logicalused", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/logicalreferenced", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/filesystem_count", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/snapshot_count", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/guid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/createtxg", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/remaptxg", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/pbkdf2iters", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/objsetid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/quota", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/reservation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/volsize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/refquota", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/refreservation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/filesystem_limit", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/snapshot_limit", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/recordsize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/special_small_blocks", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/numclones", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/name", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/iscsioptions", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/stmf_sbd_lu", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/useraccounting", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/unique", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/inconsistent", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/ivsetguid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/prevsnap", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/pbkdf2salt", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/keyguid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/priv_prop", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/creation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/altroot", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/bootfs", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/cachefile", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/comment", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/size", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/free", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/freeing", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/checkpoint", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/leaked", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/allocated", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/expandsize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/fragmentation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/capacity", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/guid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/load_guid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/health", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/dedupratio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/version", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/dedupditto", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/ashift", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/delegation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/autoreplace", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/listsnapshots", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/autoexpand", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/readonly", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/multihost", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/failmode", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/autotrim", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/name", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/maxblocksize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/tname", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/maxdnodesize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:async_destroy", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:empty_bpobj", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:lz4_compress", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.joyent:multi_vdev_crash_dump", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:spacemap_histogram", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:enabled_txg", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:hole_birth", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:zpool_checkpoint", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:spacemap_v2", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:extensible_dataset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:bookmarks", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.joyent:filesystem_limits", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:embedded_data", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.open-zfs:large_blocks", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:large_dnode", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:sha512", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:skein", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:edonr", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:device_removal", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:obsolete_counts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:userobj_accounting", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.datto:bookmark_v2", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.datto:encryption", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:project_quota", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:allocation_classes", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.datto:resilver_defer", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
futex(0x1020290, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x1020190, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xc000068148, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0xc000068148, FUTEX_WAKE_PRIVATE, 1) = 1
newfstatat(AT_FDCWD, "/usr/share/locale-langpack/en_US/LC_MESSAGES/zsys.mo", 0xc000122858, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/usr/share/locale/en_US/LC_MESSAGES/zsys.mo", 0xc000122928, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/usr/share/locale-langpack/en/LC_MESSAGES/zsys.mo", 0xc0001229f8, 0) = -1 ENOENT (No such file or directory)
newfstatat(AT_FDCWD, "/usr/share/locale/en/LC_MESSAGES/zsys.mo", 0xc000122ac8, 0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 6
setsockopt(6, SOL_SOCKET, SO_BROADCAST, [1], 4) = 0
openat(AT_FDCWD, "/proc/sys/net/core/somaxconn", O_RDONLY|O_CLOEXEC) = 7
epoll_create1(EPOLL_CLOEXEC)            = 8
epoll_ctl(8, EPOLL_CTL_ADD, 7, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=3037704192, u64=140057626259456}}) = 0
fcntl(7, F_GETFL)                       = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fcntl(7, F_SETFL, O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 0
read(7, "4096\n", 65536)                = 5
read(7, "", 65531)                      = 0
epoll_ctl(8, EPOLL_CTL_DEL, 7, 0xc00011f35c) = 0
close(7)                                = 0
setsockopt(6, SOL_SOCKET, SO_REUSEADDR, [1], 4) = 0
bind(6, {sa_family=AF_UNIX, sun_path="/run/zsysd.sock"}, 18) = 0
listen(6, 4096)                         = 0
epoll_ctl(8, EPOLL_CTL_ADD, 6, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=3037704192, u64=140057626259456}}) = 0
getsockname(6, {sa_family=AF_UNIX, sun_path="/run/zsysd.sock"}, [112->18]) = 0
fchmodat(AT_FDCWD, "/run/zsysd.sock", 0666) = 0
openat(AT_FDCWD, "/proc/cmdline", O_RDONLY|O_CLOEXEC) = 7
epoll_ctl(8, EPOLL_CTL_ADD, 7, {EPOLLIN|EPOLLOUT|EPOLLRDHUP|EPOLLET, {u32=3037703984, u64=140057626259248}}) = 0
fcntl(7, F_GETFL)                       = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fcntl(7, F_SETFL, O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 0
fstat(7, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(7, "file=/cdrom/preseed/ubuntu.seed "..., 512) = 86
read(7, "", 1450)                       = 0
epoll_ctl(8, EPOLL_CTL_DEL, 7, 0xc00011f784) = 0
close(7)                                = 0
ioctl(2, TCGETS, {B38400 opost isig icanon echo ...}) = 0
write(2, "\33[36mINFO\33[0m Building new machi"..., 60INFO Building new machines list                   
) = 60
write(2, "\33[37mDEBUG\33[0m ZFS: new scan    "..., 61DEBUG ZFS: new scan                                
) = 61
write(2, "\33[37mDEBUG\33[0m ZFS: refresh data"..., 61DEBUG ZFS: refresh dataset list                    
) = 61
mmap(NULL, 266240, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f61b50b1000
ioctl(3, _IOC(_IOC_NONE, 0x5a, 0x4, 0)

zfs list under strace, also hangs

[...]
stat("/sys/module/zfs/properties.dataset/referenced", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/compressratio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/refcompressratio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/volblocksize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbysnapshots", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbydataset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbychildren", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/usedbyrefreservation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/userrefs", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/written", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/logicalused", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/logicalreferenced", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/filesystem_count", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/snapshot_count", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/guid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/createtxg", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/remaptxg", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/pbkdf2iters", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/objsetid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/quota", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/reservation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/volsize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/refquota", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/refreservation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/filesystem_limit", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/snapshot_limit", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/recordsize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/special_small_blocks", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/numclones", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/name", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/iscsioptions", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/stmf_sbd_lu", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/useraccounting", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/unique", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/inconsistent", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/ivsetguid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/prevsnap", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/pbkdf2salt", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/keyguid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/priv_prop", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.dataset/creation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/altroot", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/bootfs", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/cachefile", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/comment", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/size", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/free", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/freeing", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/checkpoint", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/leaked", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/allocated", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/expandsize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/fragmentation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/capacity", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/guid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/load_guid", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/health", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/dedupratio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/version", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/dedupditto", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/ashift", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/delegation", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/autoreplace", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/listsnapshots", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/autoexpand", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/readonly", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/multihost", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/failmode", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/autotrim", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/name", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/maxblocksize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/tname", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/properties.pool/maxdnodesize", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:async_destroy", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:empty_bpobj", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:lz4_compress", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.joyent:multi_vdev_crash_dump", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:spacemap_histogram", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:enabled_txg", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:hole_birth", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:zpool_checkpoint", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:spacemap_v2", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:extensible_dataset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:bookmarks", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.joyent:filesystem_limits", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:embedded_data", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.open-zfs:large_blocks", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:large_dnode", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:sha512", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:skein", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.illumos:edonr", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:device_removal", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.delphix:obsolete_counts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:userobj_accounting", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.datto:bookmark_v2", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.datto:encryption", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:project_quota", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/org.zfsonlinux:allocation_classes", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/module/zfs/features.pool/com.datto:resilver_defer", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
mmap(NULL, 266240, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fd270641000
ioctl(3, _IOC(_IOC_NONE, 0x5a, 0x4, 0)
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This issue has been automatically marked as "stale" because it has not had any activity for a while. It will be closed in 90 days if no further activity occurs. Thank you for your contributions.

@stale stale bot added the Status: Stale No recent activity for issue label Apr 17, 2021
@stale stale bot closed this as completed Jul 16, 2021
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