[Pkg-zfsonlinux-devel] Bug#926213: zfsutils-linux: l2arc_feed and friends get blocked by scrub when running 4.19.28-2

Peter Van Eynde pvaneynd at debian.org
Tue Apr 2 08:10:49 BST 2019


Package: zfsutils-linux
Version: 0.7.13-1
Severity: important

Dear Maintainer,

When doing a scrub of my ZFS filesystem with 4.19 I get warnings of hung
processes, followed by the system going catatonic. This happens within
seconds of starting the scrub.

When doing the same operation after reloading into 4.9 everything works
out just fine.

I've logged the kernel logs to a ext4 partition to get the logs below.

Open to do limited testing as I need to be physically close to the machine to reboot it :/.

Best regards, Peter


Mar 25 16:01:15 frost kernel: [    0.000000] microcode: microcode updated early to revision 0x25, date = 2018-04-02
Mar 25 16:01:15 frost kernel: [    0.000000] Linux version 4.19.0-4-amd64 (debian-kernel at lists.debian.org) (gcc version 8.3.0 (Debian 8.3.0-2)) #1 SMP Debian 4.19.28-2 (2019-03-15)
Mar 25 16:01:15 frost kernel: [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-4.19.0-4-amd64 root=ZFS=mypool/ROOT/debian-1 ro init=/lib/systemd/systemd video=VGA-1:1440x900 boot=zfs quiet splash
...
Mar 25 16:01:15 frost kernel: [    0.238508] Kernel command line: BOOT_IMAGE=/vmlinuz-4.19.0-4-amd64 root=ZFS=mypool/ROOT/debian-1 ro init=/lib/systemd/systemd video=VGA-1:1440x900 boot=zfs quiet splash
...
Mar 25 16:01:15 frost kernel: [    0.320525] Memory: 32754948K/33430156K available (10252K kernel code, 1240K rwdata, 3268K rodata, 1576K init, 2308K bss, 675208K reserved, 0K cma-reserved)
Mar 25 16:01:15 frost kernel: [    0.320593] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
Mar 25 16:01:15 frost kernel: [    0.320597] Kernel/User page tables isolation: enabled
...
Mar 25 16:01:15 frost kernel: [    1.287299] io scheduler noop registered
Mar 25 16:01:15 frost kernel: [    1.287300] io scheduler deadline registered
Mar 25 16:01:15 frost kernel: [    1.287323] io scheduler cfq registered (default)
Mar 25 16:01:15 frost kernel: [    1.287324] io scheduler mq-deadline registered
...
Mar 25 16:01:15 frost kernel: [    3.654967] spl: loading out-of-tree module taints kernel.
Mar 25 16:01:15 frost kernel: [    3.655088] spl: module verification failed: signature and/or required key missing - tainting kernel
Mar 25 16:01:15 frost kernel: [    3.659020] SPL: Loaded module v0.7.13-1
Mar 25 16:01:15 frost kernel: [    3.659161] znvpair: module license 'CDDL' taints kernel.
Mar 25 16:01:15 frost kernel: [    3.659162] Disabling lock debugging due to kernel taint
Mar 25 16:01:15 frost kernel: [    5.594392] ZFS: Loaded module v0.7.13-1, ZFS pool version 5000, ZFS filesystem version 5

[starting scrub...]
Mar 29 22:40:51 frost kernel: [369625.485185] INFO: task l2arc_feed:356 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.486199]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.487265] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.488377] l2arc_feed      D    0   356      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.488383] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.488398]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.488405]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.488425]  cv_wait_common+0xf8/0x130 [spl]
Mar 29 22:40:51 frost kernel: [369625.488436]  ? finish_wait+0x80/0x80
Mar 29 22:40:51 frost kernel: [369625.488553]  spa_config_enter+0xed/0x100 [zfs]
Mar 29 22:40:51 frost kernel: [369625.488619]  l2arc_feed_thread+0x1ea/0xb70 [zfs]
Mar 29 22:40:51 frost kernel: [369625.488683]  ? l2arc_evict+0x340/0x340 [zfs]
Mar 29 22:40:51 frost kernel: [369625.488696]  ? __thread_exit+0x20/0x20 [spl]
Mar 29 22:40:51 frost kernel: [369625.488706]  thread_generic_wrapper+0x6f/0x80 [spl]
Mar 29 22:40:51 frost kernel: [369625.488714]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.488719]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.488727]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.488743] INFO: task txg_sync:928 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.489931]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.491149] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.491152] txg_sync        D    0   928      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.491157] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.491166]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.491170]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.491187]  cv_wait_common+0xf8/0x130 [spl]
Mar 29 22:40:51 frost kernel: [369625.491197]  ? finish_wait+0x80/0x80
Mar 29 22:40:51 frost kernel: [369625.491302]  spa_config_enter+0xed/0x100 [zfs]
Mar 29 22:40:51 frost kernel: [369625.492606]  spa_sync+0x15c/0xd20 [zfs]
Mar 29 22:40:51 frost kernel: [369625.492708]  txg_sync_thread+0x2c8/0x4a0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.492716]  ? __switch_to+0x8c/0x440
Mar 29 22:40:51 frost kernel: [369625.492814]  ? txg_thread_exit.isra.9+0x60/0x60 [zfs]
Mar 29 22:40:51 frost kernel: [369625.492840]  ? __thread_exit+0x20/0x20 [spl]
Mar 29 22:40:51 frost kernel: [369625.492851]  thread_generic_wrapper+0x6f/0x80 [spl]
Mar 29 22:40:51 frost kernel: [369625.492859]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.492863]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.492870]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.493015] INFO: task zpool:12795 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.494348]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.494349] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.494351] zpool           D    0 12795  24507 0x00000000
Mar 29 22:40:51 frost kernel: [369625.494356] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.494362]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.494464]  ? vdev_open_children+0x160/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.494480]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.496563]  taskq_wait+0x7a/0xc0 [spl]
Mar 29 22:40:51 frost kernel: [369625.496567]  ? finish_wait+0x80/0x80
Mar 29 22:40:51 frost kernel: [369625.496573]  taskq_destroy+0x42/0x180 [spl]
Mar 29 22:40:51 frost kernel: [369625.496621]  ? vdev_open_children+0x160/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496667]  vdev_open_children+0x10a/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496715]  vdev_root_open+0x2a/0xe0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496762]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496807]  ? vdev_cache_purge+0x6e/0x80 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496852]  vdev_reopen+0x2e/0xc0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496894]  dsl_scan+0x36/0xd0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496941]  zfs_ioc_pool_scan+0x87/0xc0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496988]  zfsdev_ioctl+0x544/0x630 [zfs]
Mar 29 22:40:51 frost kernel: [369625.496992]  do_vfs_ioctl+0xa4/0x630
Mar 29 22:40:51 frost kernel: [369625.496997]  ? handle_mm_fault+0xda/0x200
Mar 29 22:40:51 frost kernel: [369625.496999]  ksys_ioctl+0x60/0x90
Mar 29 22:40:51 frost kernel: [369625.497003]  __x64_sys_ioctl+0x16/0x20
Mar 29 22:40:51 frost kernel: [369625.497007]  do_syscall_64+0x53/0x100
Mar 29 22:40:51 frost kernel: [369625.497010]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Mar 29 22:40:51 frost kernel: [369625.497013] RIP: 0033:0x7fb40b320777
Mar 29 22:40:51 frost kernel: [369625.497018] Code: Bad RIP value.
Mar 29 22:40:51 frost kernel: [369625.497020] RSP: 002b:00007ffe1eaf0e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
Mar 29 22:40:51 frost kernel: [369625.497022] RAX: ffffffffffffffda RBX: 00007ffe1eaf0e80 RCX: 00007fb40b320777
Mar 29 22:40:51 frost kernel: [369625.497024] RDX: 00007ffe1eaf0e80 RSI: 0000000000005a07 RDI: 0000000000000003
Mar 29 22:40:51 frost kernel: [369625.497025] RBP: 0000000000000001 R08: 0000000000000008 R09: 00007fb40b3ec420
Mar 29 22:40:51 frost kernel: [369625.497026] R10: 0000556b4760c010 R11: 0000000000000246 R12: 0000556b4760e480
Mar 29 22:40:51 frost kernel: [369625.497027] R13: 0000000000000000 R14: 0000556b4760d430 R15: 0000556b4760e5d0
Mar 29 22:40:51 frost kernel: [369625.497030] INFO: task vdev_open:12796 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.497748]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.497748] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.497749] vdev_open       D    0 12796      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.497768] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.497770]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.497796]  ? vdev_open_children+0x160/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.497799]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.498637]  taskq_wait+0x7a/0xc0 [spl]
Mar 29 22:40:51 frost kernel: [369625.498650]  ? finish_wait+0x80/0x80
Mar 29 22:40:51 frost kernel: [369625.498652]  taskq_destroy+0x42/0x180 [spl]
Mar 29 22:40:51 frost kernel: [369625.498677]  ? vdev_open_children+0x160/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.498701]  vdev_open_children+0x10a/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.498731]  vdev_mirror_open+0x2a/0x120 [zfs]
Mar 29 22:40:51 frost kernel: [369625.498755]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.498758]  ? __wake_up_common_lock+0x89/0xc0
Mar 29 22:40:51 frost kernel: [369625.498781]  vdev_open_child+0x1e/0x40 [zfs]
Mar 29 22:40:51 frost kernel: [369625.498784]  taskq_thread+0x2df/0x520 [spl]
Mar 29 22:40:51 frost kernel: [369625.498786]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.498789]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.498792]  ? taskq_thread_spawn+0x50/0x50 [spl]
Mar 29 22:40:51 frost kernel: [369625.498794]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.498796]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.498797]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.498799] INFO: task vdev_open:12797 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.498801]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.499649] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.499649] vdev_open       D    0 12797      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.499660] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.499661]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.499693]  ? vdev_open_children+0x160/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.499696]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.500124]  taskq_wait+0x7a/0xc0 [spl]
Mar 29 22:40:51 frost kernel: [369625.500126]  ? finish_wait+0x80/0x80
Mar 29 22:40:51 frost kernel: [369625.500129]  taskq_destroy+0x42/0x180 [spl]
Mar 29 22:40:51 frost kernel: [369625.500151]  ? vdev_open_children+0x160/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.500174]  vdev_open_children+0x10a/0x160 [zfs]
Mar 29 22:40:51 frost kernel: [369625.500196]  vdev_mirror_open+0x2a/0x120 [zfs]
Mar 29 22:40:51 frost kernel: [369625.500219]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.500221]  ? __wake_up_common_lock+0x89/0xc0
Mar 29 22:40:51 frost kernel: [369625.500243]  vdev_open_child+0x1e/0x40 [zfs]
Mar 29 22:40:51 frost kernel: [369625.500246]  taskq_thread+0x2df/0x520 [spl]
Mar 29 22:40:51 frost kernel: [369625.500248]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.500249]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.500252]  ? taskq_thread_spawn+0x50/0x50 [spl]
Mar 29 22:40:51 frost kernel: [369625.500253]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.500254]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.500256]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.500258] INFO: task vdev_open:12799 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.500258]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.500259] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.500260] vdev_open       D    0 12799      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.501671] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.501673]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.501674]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.501685]  schedule_timeout+0x26d/0x390
Mar 29 22:40:51 frost kernel: [369625.501686]  ? try_to_wake_up+0x54/0x490
Mar 29 22:40:51 frost kernel: [369625.501687]  wait_for_completion+0x11f/0x190
Mar 29 22:40:51 frost kernel: [369625.501689]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.501690]  call_usermodehelper_exec+0x12e/0x160
Mar 29 22:40:51 frost kernel: [369625.501715]  vdev_elevator_switch+0x10e/0x190 [zfs]
Mar 29 22:40:51 frost kernel: [369625.501739]  vdev_disk_open+0xed/0x420 [zfs]
Mar 29 22:40:51 frost kernel: [369625.501742]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.501743]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.501745]  ? __switch_to+0x8c/0x440
Mar 29 22:40:51 frost kernel: [369625.501746]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.501747]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.501771]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.501773]  ? __wake_up_common_lock+0x89/0xc0
Mar 29 22:40:51 frost kernel: [369625.501796]  vdev_open_child+0x1e/0x40 [zfs]
Mar 29 22:40:51 frost kernel: [369625.501800]  taskq_thread+0x2df/0x520 [spl]
Mar 29 22:40:51 frost kernel: [369625.501802]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.501803]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.501806]  ? taskq_thread_spawn+0x50/0x50 [spl]
Mar 29 22:40:51 frost kernel: [369625.501807]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.501814]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.501815]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.501816] INFO: task vdev_open:12801 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.502295]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.502295] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.502295] vdev_open       D    0 12801      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.502296] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.502298]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.502309]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.502310]  schedule_timeout+0x26d/0x390
Mar 29 22:40:51 frost kernel: [369625.502311]  ? vsnprintf+0x138/0x4d0
Mar 29 22:40:51 frost kernel: [369625.502312]  wait_for_completion+0x11f/0x190
Mar 29 22:40:51 frost kernel: [369625.502313]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.502315]  call_usermodehelper_exec+0x12e/0x160
Mar 29 22:40:51 frost kernel: [369625.502339]  vdev_elevator_switch+0x10e/0x190 [zfs]
Mar 29 22:40:51 frost kernel: [369625.502364]  vdev_disk_open+0xed/0x420 [zfs]
Mar 29 22:40:51 frost kernel: [369625.503371]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.503372]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.503383]  ? __switch_to+0x8c/0x440
Mar 29 22:40:51 frost kernel: [369625.503384]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.503385]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.503409]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.503411]  ? __wake_up_common_lock+0x89/0xc0
Mar 29 22:40:51 frost kernel: [369625.503435]  vdev_open_child+0x1e/0x40 [zfs]
Mar 29 22:40:51 frost kernel: [369625.503439]  taskq_thread+0x2df/0x520 [spl]
Mar 29 22:40:51 frost kernel: [369625.503441]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.503442]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.503445]  ? taskq_thread_spawn+0x50/0x50 [spl]
Mar 29 22:40:51 frost kernel: [369625.503447]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.503450]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.503451]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.503453] INFO: task vdev_open:12802 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.503454]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.503454] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.503454] vdev_open       D    0 12802      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.505031] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.505032]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.505033]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.505034]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.505045]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.505046]  schedule_timeout+0x26d/0x390
Mar 29 22:40:51 frost kernel: [369625.505047]  ? __schedule+0x2aa/0x870
Mar 29 22:40:51 frost kernel: [369625.505048]  ? try_to_wake_up+0x54/0x490
Mar 29 22:40:51 frost kernel: [369625.505049]  wait_for_completion+0x11f/0x190
Mar 29 22:40:51 frost kernel: [369625.505051]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.505052]  call_usermodehelper_exec+0x12e/0x160
Mar 29 22:40:51 frost kernel: [369625.505076]  vdev_elevator_switch+0x10e/0x190 [zfs]
Mar 29 22:40:51 frost kernel: [369625.505101]  vdev_disk_open+0xed/0x420 [zfs]
Mar 29 22:40:51 frost kernel: [369625.505117]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.505119]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.505120]  ? __switch_to+0x8c/0x440
Mar 29 22:40:51 frost kernel: [369625.505121]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.505122]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.505147]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.505152]  ? __wake_up_common_lock+0x89/0xc0
Mar 29 22:40:51 frost kernel: [369625.505178]  vdev_open_child+0x1e/0x40 [zfs]
Mar 29 22:40:51 frost kernel: [369625.505183]  taskq_thread+0x2df/0x520 [spl]
Mar 29 22:40:51 frost kernel: [369625.505186]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.505190]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.505195]  ? taskq_thread_spawn+0x50/0x50 [spl]
Mar 29 22:40:51 frost kernel: [369625.505197]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.505200]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.505203]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.505206] INFO: task vdev_open:12804 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.505770]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.505770] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.505771] vdev_open       D    0 12804      2 0x80000000
Mar 29 22:40:51 frost kernel: [369625.505772] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.505783]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.505784]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.505785]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.505786]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.505787]  schedule_timeout+0x26d/0x390
Mar 29 22:40:51 frost kernel: [369625.505789]  ? __schedule+0x2aa/0x870
Mar 29 22:40:51 frost kernel: [369625.506951]  ? try_to_wake_up+0x54/0x490
Mar 29 22:40:51 frost kernel: [369625.506952]  wait_for_completion+0x11f/0x190
Mar 29 22:40:51 frost kernel: [369625.506953]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.506964]  call_usermodehelper_exec+0x12e/0x160
Mar 29 22:40:51 frost kernel: [369625.506986]  vdev_elevator_switch+0x10e/0x190 [zfs]
Mar 29 22:40:51 frost kernel: [369625.507009]  vdev_disk_open+0xed/0x420 [zfs]
Mar 29 22:40:51 frost kernel: [369625.507011]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.507012]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.507013]  ? __switch_to+0x8c/0x440
Mar 29 22:40:51 frost kernel: [369625.507018]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.507019]  ? __switch_to_asm+0x40/0x70
Mar 29 22:40:51 frost kernel: [369625.507042]  vdev_open+0xa8/0x660 [zfs]
Mar 29 22:40:51 frost kernel: [369625.507044]  ? __wake_up_common_lock+0x89/0xc0
Mar 29 22:40:51 frost kernel: [369625.507066]  vdev_open_child+0x1e/0x40 [zfs]
Mar 29 22:40:51 frost kernel: [369625.507070]  taskq_thread+0x2df/0x520 [spl]
Mar 29 22:40:51 frost kernel: [369625.507072]  ? __switch_to_asm+0x34/0x70
Mar 29 22:40:51 frost kernel: [369625.507073]  ? wake_up_q+0x70/0x70
Mar 29 22:40:51 frost kernel: [369625.507077]  ? taskq_thread_spawn+0x50/0x50 [spl]
Mar 29 22:40:51 frost kernel: [369625.507078]  kthread+0x112/0x130
Mar 29 22:40:51 frost kernel: [369625.507079]  ? kthread_bind+0x30/0x30
Mar 29 22:40:51 frost kernel: [369625.507080]  ret_from_fork+0x35/0x40
Mar 29 22:40:51 frost kernel: [369625.507083] INFO: task modprobe:12812 blocked for more than 120 seconds.
Mar 29 22:40:51 frost kernel: [369625.507085]       Tainted: P           OE     4.19.0-4-amd64 #1 Debian 4.19.28-2
Mar 29 22:40:51 frost kernel: [369625.508224] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 29 22:40:51 frost kernel: [369625.508224] modprobe        D    0 12812  12809 0x00000000
Mar 29 22:40:51 frost kernel: [369625.508225] Call Trace:
Mar 29 22:40:51 frost kernel: [369625.508226]  ? __schedule+0x2a2/0x870
Mar 29 22:40:51 frost kernel: [369625.508227]  schedule+0x28/0x80
Mar 29 22:40:51 frost kernel: [369625.508241]  cv_wait_common+0xf8/0x130 [spl]
Mar 29 22:40:51 frost kernel: [369625.508242]  ? finish_wait+0x80/0x80
Mar 29 22:40:51 frost kernel: [369625.508266]  spa_config_enter+0xed/0x100 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508859]  zio_vdev_io_start+0x326/0x330 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508863]  ? tsd_get_by_thread+0x2a/0x40 [spl]
Mar 29 22:40:51 frost kernel: [369625.508885]  zio_nowait+0xc3/0x150 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508899]  arc_read+0x617/0xa50 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508914]  ? dbuf_rele_and_unlock+0x4f0/0x4f0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508936]  ? zio_null+0x2b/0x30 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508950]  dbuf_read+0x1f6/0x950 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508968]  ? dnode_rele_and_unlock+0x53/0xb0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.508984]  dmu_buf_hold+0x49/0x80 [zfs]
Mar 29 22:40:51 frost kernel: [369625.509008]  zap_lockdir+0x4e/0xb0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.509031]  zap_cursor_retrieve+0x179/0x2d0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.509033]  ? __check_object_size+0x41/0x189
Mar 29 22:40:51 frost kernel: [369625.509035]  ? _copy_to_user+0x26/0x30
Mar 29 22:40:51 frost kernel: [369625.509037]  ? filldir64+0xce/0x130
Mar 29 22:40:51 frost kernel: [369625.509060]  zfs_readdir+0x127/0x3f0 [zfs]
Mar 29 22:40:51 frost kernel: [369625.509062]  ? filename_lookup.part.62+0xe0/0x170
Mar 29 22:40:51 frost kernel: [369625.509064]  ? mem_cgroup_commit_charge+0x7a/0x560
Mar 29 22:40:51 frost kernel: [369625.509066]  ? mem_cgroup_try_charge+0x8b/0x1a0
Mar 29 22:40:51 frost kernel: [369625.509070]  ? _cond_resched+0x15/0x30
Mar 29 22:40:51 frost kernel: [369625.509071]  ? dput.part.32+0x29/0x110
Mar 29 22:40:51 frost kernel: [369625.509073]  ? __fsnotify_parent+0x96/0x120
Mar 29 22:40:51 frost kernel: [369625.509095]  zpl_iterate+0x4c/0x70 [zfs]
Mar 29 22:40:51 frost kernel: [369625.509097]  iterate_dir+0x138/0x180
Mar 29 22:40:51 frost kernel: [369625.509099]  ksys_getdents64+0x9c/0x130
Mar 29 22:40:51 frost kernel: [369625.509100]  ? iterate_dir+0x180/0x180
Mar 29 22:40:51 frost kernel: [369625.509115]  __x64_sys_getdents64+0x16/0x20
Mar 29 22:40:51 frost kernel: [369625.509118]  do_syscall_64+0x53/0x100
Mar 29 22:40:51 frost kernel: [369625.509121]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Mar 29 22:40:51 frost kernel: [369625.509123] RIP: 0033:0x7fa1d89b9147
Mar 29 22:40:51 frost kernel: [369625.509125] Code: Bad RIP value.
Mar 29 22:40:51 frost kernel: [369625.509125] RSP: 002b:00007fff0f97ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
Mar 29 22:40:51 frost kernel: [369625.509126] RAX: ffffffffffffffda RBX: 000055ec880a5440 RCX: 00007fa1d89b9147
Mar 29 22:40:51 frost kernel: [369625.509127] RDX: 0000000000008000 RSI: 000055ec880a5470 RDI: 0000000000000000
Mar 29 22:40:51 frost kernel: [369625.509131] RBP: 000055ec880a5470 R08: 0000000000000003 R09: 0000000000000078
Mar 29 22:40:51 frost kernel: [369625.509132] R10: 000055ec880a5010 R11: 0000000000000246 R12: ffffffffffffff80
Mar 29 22:40:51 frost kernel: [369625.509136] R13: 0000000000000000 R14: 000055ec86225068 R15: 000055ec880a52d0

# arc_summary

------------------------------------------------------------------------
ZFS Subsystem Report				Tue Apr 02 09:07:34 2019
ARC Summary: (HEALTHY)
	Memory Throttle Count:			0

ARC Misc:
	Deleted:				4.98M
	Mutex Misses:				72
	Evict Skips:				468

ARC Size:				99.32%	15.55	GiB
	Target Size: (Adaptive)		100.00%	15.65	GiB
	Min Size (Hard Limit):		6.25%	1001.84	MiB
	Max Size (High Water):		16:1	15.65	GiB

ARC Size Breakdown:
	Recently Used Cache Size:	59.06%	7.80	GiB
	Frequently Used Cache Size:	40.94%	5.41	GiB

ARC Hash Breakdown:
	Elements Max:				2.67M
	Elements Current:		45.20%	1.21M
	Collisions:				5.30M
	Chain Max:				7
	Chains:					143.29k

ARC Total accesses:					3.41G
	Cache Hit Ratio:		97.04%	3.31G
	Cache Miss Ratio:		2.96%	100.81M
	Actual Hit Ratio:		96.86%	3.30G

	Data Demand Efficiency:		99.86%	2.13G
	Data Prefetch Efficiency:	32.03%	721.72k

	CACHE HITS BY CACHE LIST:
	  Anonymously Used:		0.17%	5.69M
	  Most Recently Used:		0.76%	25.01M
	  Most Frequently Used:		99.05%	3.28G
	  Most Recently Used Ghost:	0.00%	160.54k
	  Most Frequently Used Ghost:	0.02%	551.08k

	CACHE HITS BY DATA TYPE:
	  Demand Data:			64.24%	2.13G
	  Prefetch Data:		0.01%	231.20k
	  Demand Metadata:		35.37%	1.17G
	  Prefetch Metadata:		0.38%	12.71M

	CACHE MISSES BY DATA TYPE:
	  Demand Data:			2.91%	2.94M
	  Prefetch Data:		0.49%	490.52k
	  Demand Metadata:		91.70%	92.45M
	  Prefetch Metadata:		4.90%	4.94M

L2 ARC Summary: (HEALTHY)
	Low Memory Aborts:			0
	Free on Write:				8.15k
	R/W Clashes:				0
	Bad Checksums:				0
	IO Errors:				0

L2 ARC Size: (Adaptive)				34.56	GiB
	Compressed:			78.56%	27.15	GiB
	Header Size:			0.07%	25.47	MiB

L2 ARC Breakdown:				100.81M
	Hit Ratio:			0.52%	526.05k
	Miss Ratio:			99.48%	100.28M
	Feeds:					288.98k

L2 ARC Writes:
	Writes Sent:			100.00%	127.19k

DMU Prefetch Efficiency:					2.31G
	Hit Ratio:			0.05%	1.17M
	Miss Ratio:			99.95%	2.31G



ZFS Tunables:
	dbuf_cache_hiwater_pct                            10
	dbuf_cache_lowater_pct                            10
	dbuf_cache_max_bytes                              104857600
	dbuf_cache_max_shift                              5
	dmu_object_alloc_chunk_shift                      7
	ignore_hole_birth                                 1
	l2arc_feed_again                                  1
	l2arc_feed_min_ms                                 200
	l2arc_feed_secs                                   1
	l2arc_headroom                                    2
	l2arc_headroom_boost                              200
	l2arc_noprefetch                                  1
	l2arc_norw                                        0
	l2arc_write_boost                                 8388608
	l2arc_write_max                                   8388608
	metaslab_aliquot                                  524288
	metaslab_bias_enabled                             1
	metaslab_debug_load                               0
	metaslab_debug_unload                             0
	metaslab_fragmentation_factor_enabled             1
	metaslab_lba_weighting_enabled                    1
	metaslab_preload_enabled                          1
	metaslabs_per_vdev                                200
	send_holes_without_birth_time                     1
	spa_asize_inflation                               24
	spa_config_path                                   /etc/zfs/zpool.cache
	spa_load_verify_data                              1
	spa_load_verify_maxinflight                       10000
	spa_load_verify_metadata                          1
	spa_slop_shift                                    5
	zfetch_array_rd_sz                                1048576
	zfetch_max_distance                               8388608
	zfetch_max_streams                                8
	zfetch_min_sec_reap                               2
	zfs_abd_scatter_enabled                           1
	zfs_abd_scatter_max_order                         10
	zfs_admin_snapshot                                1
	zfs_arc_average_blocksize                         8192
	zfs_arc_dnode_limit                               0
	zfs_arc_dnode_limit_percent                       10
	zfs_arc_dnode_reduce_percent                      10
	zfs_arc_grow_retry                                0
	zfs_arc_lotsfree_percent                          10
	zfs_arc_max                                       0
	zfs_arc_meta_adjust_restarts                      4096
	zfs_arc_meta_limit                                0
	zfs_arc_meta_limit_percent                        75
	zfs_arc_meta_min                                  0
	zfs_arc_meta_prune                                10000
	zfs_arc_meta_strategy                             1
	zfs_arc_min                                       0
	zfs_arc_min_prefetch_lifespan                     0
	zfs_arc_p_dampener_disable                        1
	zfs_arc_p_min_shift                               0
	zfs_arc_pc_percent                                0
	zfs_arc_shrink_shift                              0
	zfs_arc_sys_free                                  0
	zfs_autoimport_disable                            1
	zfs_checksums_per_second                          20
	zfs_compressed_arc_enabled                        1
	zfs_dbgmsg_enable                                 0
	zfs_dbgmsg_maxsize                                4194304
	zfs_dbuf_state_index                              0
	zfs_deadman_checktime_ms                          5000
	zfs_deadman_enabled                               1
	zfs_deadman_synctime_ms                           1000000
	zfs_dedup_prefetch                                0
	zfs_delay_min_dirty_percent                       60
	zfs_delay_scale                                   500000
	zfs_delays_per_second                             20
	zfs_delete_blocks                                 20480
	zfs_dirty_data_max                                3361601536
	zfs_dirty_data_max_max                            4294967296
	zfs_dirty_data_max_max_percent                    25
	zfs_dirty_data_max_percent                        10
	zfs_dirty_data_sync                               67108864
	zfs_dmu_offset_next_sync                          0
	zfs_expire_snapshot                               300
	zfs_flags                                         0
	zfs_free_bpobj_enabled                            1
	zfs_free_leak_on_eio                              0
	zfs_free_max_blocks                               100000
	zfs_free_min_time_ms                              1000
	zfs_immediate_write_sz                            32768
	zfs_max_recordsize                                1048576
	zfs_mdcomp_disable                                0
	zfs_metaslab_fragmentation_threshold              70
	zfs_metaslab_segment_weight_enabled               1
	zfs_metaslab_switch_threshold                     2
	zfs_mg_fragmentation_threshold                    85
	zfs_mg_noalloc_threshold                          0
	zfs_multihost_fail_intervals                      5
	zfs_multihost_history                             0
	zfs_multihost_import_intervals                    10
	zfs_multihost_interval                            1000
	zfs_multilist_num_sublists                        0
	zfs_no_scrub_io                                   0
	zfs_no_scrub_prefetch                             0
	zfs_nocacheflush                                  0
	zfs_nopwrite_enabled                              1
	zfs_object_mutex_size                             64
	zfs_pd_bytes_max                                  52428800
	zfs_per_txg_dirty_frees_percent                   30
	zfs_prefetch_disable                              0
	zfs_read_chunk_size                               1048576
	zfs_read_history                                  0
	zfs_read_history_hits                             0
	zfs_recover                                       0
	zfs_recv_queue_length                             16777216
	zfs_resilver_delay                                2
	zfs_resilver_min_time_ms                          3000
	zfs_scan_idle                                     50
	zfs_scan_ignore_errors                            0
	zfs_scan_min_time_ms                              1000
	zfs_scrub_delay                                   4
	zfs_send_corrupt_data                             0
	zfs_send_queue_length                             16777216
	zfs_sync_pass_deferred_free                       2
	zfs_sync_pass_dont_compress                       5
	zfs_sync_pass_rewrite                             2
	zfs_sync_taskq_batch_pct                          75
	zfs_top_maxinflight                               32
	zfs_txg_history                                   0
	zfs_txg_timeout                                   5
	zfs_vdev_aggregation_limit                        131072
	zfs_vdev_async_read_max_active                    3
	zfs_vdev_async_read_min_active                    1
	zfs_vdev_async_write_active_max_dirty_percent     60
	zfs_vdev_async_write_active_min_dirty_percent     30
	zfs_vdev_async_write_max_active                   10
	zfs_vdev_async_write_min_active                   2
	zfs_vdev_cache_bshift                             16
	zfs_vdev_cache_max                                16384
	zfs_vdev_cache_size                               0
	zfs_vdev_max_active                               1000
	zfs_vdev_mirror_non_rotating_inc                  0
	zfs_vdev_mirror_non_rotating_seek_inc             1
	zfs_vdev_mirror_rotating_inc                      0
	zfs_vdev_mirror_rotating_seek_inc                 5
	zfs_vdev_mirror_rotating_seek_offset              1048576
	zfs_vdev_queue_depth_pct                          1000
	zfs_vdev_raidz_impl                               [fastest] original scalar sse2 ssse3 avx2
	zfs_vdev_read_gap_limit                           32768
	zfs_vdev_scheduler                                noop
	zfs_vdev_scrub_max_active                         2
	zfs_vdev_scrub_min_active                         1
	zfs_vdev_sync_read_max_active                     10
	zfs_vdev_sync_read_min_active                     10
	zfs_vdev_sync_write_max_active                    10
	zfs_vdev_sync_write_min_active                    10
	zfs_vdev_write_gap_limit                          4096
	zfs_zevent_cols                                   80
	zfs_zevent_console                                0
	zfs_zevent_len_max                                64
	zfs_zil_clean_taskq_maxalloc                      1048576
	zfs_zil_clean_taskq_minalloc                      1024
	zfs_zil_clean_taskq_nthr_pct                      100
	zil_replay_disable                                0
	zil_slog_bulk                                     786432
	zio_delay_max                                     30000
	zio_dva_throttle_enabled                          1
	zio_requeue_io_start_cut_in_line                  1
	zio_taskq_batch_pct                               75
	zvol_inhibit_dev                                  0
	zvol_major                                        230
	zvol_max_discard_blocks                           16384
	zvol_prefetch_bytes                               131072
	zvol_request_sync                                 0
	zvol_threads                                      32
	zvol_volmode                                      1
# zpool status -v
  pool: mybackup
 state: ONLINE
  scan: scrub repaired 0B in 7h51m with 0 errors on Mon Apr  1 15:35:47 2019
config:

        NAME                                                   STATE     READ WRITE CKSUM
        mybackup                                               ONLINE       0     0     0
          mirror-0                                             ONLINE       0     0     0
            ata-SAMSUNG_HD204UI_S2H7J1BZB01231                 ONLINE       0     0     0
            ata-WDC_WD20EARX-00PASB0_WD-WCAZAE074784           ONLINE       0     0     0
        logs
          mirror-1                                             ONLINE       0     0     0
            ata-INTEL_SSDSC2BX480G4K_BTHC7264088R480MGN-part4  ONLINE       0     0     0
            ata-INTEL_SSDSC2BX480G4K_BTHC73040BK9480MGN-part4  ONLINE       0     0     0

errors: No known data errors

  pool: mypool
 state: ONLINE
  scan: scrub repaired 0B in 12h57m with 0 errors on Mon Apr  1 20:41:20 2019
config:

        NAME                                                   STATE     READ WRITE CKSUM
        mypool                                                 ONLINE       0     0     0
          mirror-0                                             ONLINE       0     0     0
            ata-WDC_WD30EFRX-68EUZN0_WD-WMC4N2670271           ONLINE       0     0     0
            ata-WDC_WD30EFRX-68EUZN0_WD-WCC4N7DA5DLU           ONLINE       0     0     0
          mirror-1                                             ONLINE       0     0     0
            ata-WDC_WD30EFRX-68EUZN0_WD-WMC4N0839245           ONLINE       0     0     0
            wwn-0x50014ee20f242475                             ONLINE       0     0     0
        logs
          mirror-2                                             ONLINE       0     0     0
            ata-INTEL_SSDSC2BX480G4K_BTHC7264088R480MGN-part5  ONLINE       0     0     0
            ata-INTEL_SSDSC2BX480G4K_BTHC73040BK9480MGN-part5  ONLINE       0     0     0
        cache
          ata-INTEL_SSDSC2BX480G4K_BTHC7264088R480MGN-part6    ONLINE       0     0     0
          ata-INTEL_SSDSC2BX480G4K_BTHC73040BK9480MGN-part6    ONLINE       0     0     0

errors: No known data errors


-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-8-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE
Locale: LANG=en_IE:en, LC_CTYPE=en_IE:en (charmap=UTF-8) (ignored: LC_ALL set to en_IE.UTF-8), LANGUAGE=en_IE:en (charmap=UTF-8) (ignored: LC_ALL set to en_IE.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages zfsutils-linux depends on:
ii  libblkid1        2.33.1-0.1
ii  libc6            2.28-8
ii  libnvpair1linux  0.7.13-1
ii  libuuid1         2.33.1-0.1
ii  libuutil1linux   0.7.13-1
ii  libzfs2linux     0.7.13-1
ii  libzpool2linux   0.7.13-1
ii  python3          3.7.3-1
ii  zlib1g           1:1.2.11.dfsg-1

Versions of packages zfsutils-linux recommends:
ii  lsb-base                10.2019031300
ii  zfs-dkms [zfs-modules]  0.7.13-1
ii  zfs-zed                 0.7.13-1

Versions of packages zfsutils-linux suggests:
ii  nfs-kernel-server  1:1.3.4-2.4
ii  samba-common-bin   2:4.9.5+dfsg-2
ii  zfs-initramfs      0.7.13-1

-- Configuration Files:
/etc/default/zfs changed:
ZFS_MOUNT='yes'
ZFS_UNMOUNT='yes'
ZFS_SHARE='yes'
ZFS_UNSHARE='yes'
ZPOOL_IMPORT_ALL_VISIBLE='no'
ZPOOL_IMPORT_PATH="/dev/disk/by-id"
ZFS_POOL_IMPORT="mypool;mybackup"
VERBOSE_MOUNT='no'
DO_OVERLAY_MOUNTS='no'
ZPOOL_IMPORT_OPTS=""
MOUNT_EXTRA_OPTIONS=""
ZFS_DKMS_ENABLE_DEBUG_DMU_TX='no'
ZFS_DKMS_ENABLE_DEBUG='no'
ZFS_DKMS_ENABLE_DEBUG_DMU_TX='no'
ZFS_DKMS_DISABLE_STRIP='no'
ZFS_INITRD_PRE_MOUNTROOT_SLEEP='0'
ZFS_INITRD_POST_MODPROBE_SLEEP='0'


-- no debconf information



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