Thanks for the data.

I've added a couple more lines of debug now to figure out some earlier
missing information once we pop the stack.  I've updated the package in
the PPA, do you mind updating the zfs-dkms to
0.7.5-1ubuntu16.10~lp1861235.2 and re-testing?

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to zfs-linux in Ubuntu.
https://bugs.launchpad.net/bugs/1861235

Title:
  zfs recv PANIC at range_tree.c:304:range_tree_find_impl()

Status in Linux:
  New
Status in zfs-linux package in Ubuntu:
  Incomplete
Status in zfs-linux source package in Bionic:
  New

Bug description:
  Same as bug 1861228 but with a newer kernel installed.

  [  790.702566] VERIFY(size != 0) failed
  [  790.702590] PANIC at range_tree.c:304:range_tree_find_impl()
  [  790.702611] Showing stack for process 28685
  [  790.702614] CPU: 17 PID: 28685 Comm: receive_writer Tainted: P           O 
    4.15.0-76-generic #86-Ubuntu
  [  790.702615] Hardware name: Supermicro SSG-6038R-E1CR16L/X10DRH-iT, BIOS 
2.0 12/17/2015
  [  790.702616] Call Trace:
  [  790.702626]  dump_stack+0x6d/0x8e
  [  790.702637]  spl_dumpstack+0x42/0x50 [spl]
  [  790.702640]  spl_panic+0xc8/0x110 [spl]
  [  790.702645]  ? __switch_to_asm+0x41/0x70
  [  790.702714]  ? arc_prune_task+0x1a/0x40 [zfs]
  [  790.702740]  ? dbuf_dirty+0x43d/0x850 [zfs]
  [  790.702745]  ? getrawmonotonic64+0x43/0xd0
  [  790.702746]  ? getrawmonotonic64+0x43/0xd0
  [  790.702775]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [  790.702778]  ? getrawmonotonic64+0x43/0xd0
  [  790.702805]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [  790.702807]  ? mutex_lock+0x12/0x40
  [  790.702833]  ? dbuf_rele_and_unlock+0x1a8/0x4b0 [zfs]
  [  790.702866]  range_tree_find_impl+0x88/0x90 [zfs]
  [  790.702870]  ? spl_kmem_zalloc+0xdc/0x1a0 [spl]
  [  790.702902]  range_tree_clear+0x4f/0x60 [zfs]
  [  790.702930]  dnode_free_range+0x11f/0x5a0 [zfs]
  [  790.702957]  dmu_object_free+0x53/0x90 [zfs]
  [  790.702983]  dmu_free_long_object+0x9f/0xc0 [zfs]
  [  790.703010]  receive_freeobjects.isra.12+0x7a/0x100 [zfs]
  [  790.703036]  receive_writer_thread+0x6d2/0xa60 [zfs]
  [  790.703040]  ? set_curr_task_fair+0x2b/0x60
  [  790.703043]  ? spl_kmem_free+0x33/0x40 [spl]
  [  790.703048]  ? kfree+0x165/0x180
  [  790.703073]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
  [  790.703078]  thread_generic_wrapper+0x74/0x90 [spl]
  [  790.703081]  kthread+0x121/0x140
  [  790.703084]  ? __thread_exit+0x20/0x20 [spl]
  [  790.703085]  ? kthread_create_worker_on_cpu+0x70/0x70
  [  790.703088]  ret_from_fork+0x35/0x40
  [  967.636923] INFO: task txg_quiesce:14810 blocked for more than 120 seconds.
  [  967.636979]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [  967.637024] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  967.637076] txg_quiesce     D    0 14810      2 0x80000000
  [  967.637080] Call Trace:
  [  967.637089]  __schedule+0x24e/0x880
  [  967.637092]  schedule+0x2c/0x80
  [  967.637106]  cv_wait_common+0x11e/0x140 [spl]
  [  967.637114]  ? wait_woken+0x80/0x80
  [  967.637122]  __cv_wait+0x15/0x20 [spl]
  [  967.637210]  txg_quiesce_thread+0x2cb/0x3d0 [zfs]
  [  967.637278]  ? txg_delay+0x1b0/0x1b0 [zfs]
  [  967.637286]  thread_generic_wrapper+0x74/0x90 [spl]
  [  967.637291]  kthread+0x121/0x140
  [  967.637297]  ? __thread_exit+0x20/0x20 [spl]
  [  967.637299]  ? kthread_create_worker_on_cpu+0x70/0x70
  [  967.637304]  ret_from_fork+0x35/0x40
  [  967.637326] INFO: task zfs:28590 blocked for more than 120 seconds.
  [  967.637371]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [  967.637416] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  967.637467] zfs             D    0 28590  28587 0x80000080
  [  967.637470] Call Trace:
  [  967.637474]  __schedule+0x24e/0x880
  [  967.637477]  schedule+0x2c/0x80
  [  967.637486]  cv_wait_common+0x11e/0x140 [spl]
  [  967.637491]  ? wait_woken+0x80/0x80
  [  967.637498]  __cv_wait+0x15/0x20 [spl]
  [  967.637554]  dmu_recv_stream+0xa51/0xef0 [zfs]
  [  967.637630]  zfs_ioc_recv_impl+0x306/0x1100 [zfs]
  [  967.637679]  ? dbuf_read+0x34a/0x920 [zfs]
  [  967.637725]  ? dbuf_rele+0x36/0x40 [zfs]
  [  967.637728]  ? _cond_resched+0x19/0x40
  [  967.637798]  zfs_ioc_recv_new+0x33d/0x410 [zfs]
  [  967.637809]  ? spl_kmem_alloc_impl+0xe5/0x1a0 [spl]
  [  967.637816]  ? spl_vmem_alloc+0x19/0x20 [spl]
  [  967.637828]  ? nv_alloc_sleep_spl+0x1f/0x30 [znvpair]
  [  967.637834]  ? nv_mem_zalloc.isra.0+0x2e/0x40 [znvpair]
  [  967.637840]  ? nvlist_xalloc.part.2+0x50/0xb0 [znvpair]
  [  967.637905]  zfsdev_ioctl+0x451/0x610 [zfs]
  [  967.637913]  do_vfs_ioctl+0xa8/0x630
  [  967.637917]  ? __audit_syscall_entry+0xbc/0x110
  [  967.637924]  ? syscall_trace_enter+0x1da/0x2d0
  [  967.637927]  SyS_ioctl+0x79/0x90
  [  967.637930]  do_syscall_64+0x73/0x130
  [  967.637935]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  967.637938] RIP: 0033:0x7fc305a905d7
  [  967.637940] RSP: 002b:00007ffc45e39618 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
  [  967.637943] RAX: ffffffffffffffda RBX: 0000000000005a46 RCX: 
00007fc305a905d7
  [  967.637945] RDX: 00007ffc45e39630 RSI: 0000000000005a46 RDI: 
0000000000000006
  [  967.637946] RBP: 00007ffc45e39630 R08: 00007fc305d65e20 R09: 
0000000000000000
  [  967.637948] R10: 00005648313c7010 R11: 0000000000000246 R12: 
00007ffc45e3cc60
  [  967.637949] R13: 0000000000000006 R14: 00005648313cef10 R15: 
000000000000000c
  [  967.637960] INFO: task receive_writer:28685 blocked for more than 120 
seconds.
  [  967.638010]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [  967.638055] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [  967.638107] receive_writer  D    0 28685      2 0x80000080
  [  967.638109] Call Trace:
  [  967.638113]  __schedule+0x24e/0x880
  [  967.638117]  schedule+0x2c/0x80
  [  967.638126]  spl_panic+0xfa/0x110 [spl]
  [  967.638175]  ? arc_prune_task+0x1a/0x40 [zfs]
  [  967.638223]  ? dbuf_dirty+0x43d/0x850 [zfs]
  [  967.638229]  ? getrawmonotonic64+0x43/0xd0
  [  967.638232]  ? getrawmonotonic64+0x43/0xd0
  [  967.638289]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [  967.638293]  ? getrawmonotonic64+0x43/0xd0
  [  967.638344]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [  967.638348]  ? mutex_lock+0x12/0x40
  [  967.638395]  ? dbuf_rele_and_unlock+0x1a8/0x4b0 [zfs]
  [  967.638461]  range_tree_find_impl+0x88/0x90 [zfs]
  [  967.638468]  ? spl_kmem_zalloc+0xdc/0x1a0 [spl]
  [  967.638530]  range_tree_clear+0x4f/0x60 [zfs]
  [  967.638583]  dnode_free_range+0x11f/0x5a0 [zfs]
  [  967.638635]  dmu_object_free+0x53/0x90 [zfs]
  [  967.638685]  dmu_free_long_object+0x9f/0xc0 [zfs]
  [  967.638738]  receive_freeobjects.isra.12+0x7a/0x100 [zfs]
  [  967.638787]  receive_writer_thread+0x6d2/0xa60 [zfs]
  [  967.638792]  ? set_curr_task_fair+0x2b/0x60
  [  967.638800]  ? spl_kmem_free+0x33/0x40 [spl]
  [  967.638805]  ? kfree+0x165/0x180
  [  967.638852]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
  [  967.638860]  thread_generic_wrapper+0x74/0x90 [spl]
  [  967.638863]  kthread+0x121/0x140
  [  967.638869]  ? __thread_exit+0x20/0x20 [spl]
  [  967.638872]  ? kthread_create_worker_on_cpu+0x70/0x70
  [  967.638876]  ret_from_fork+0x35/0x40
  [ 1088.467860] INFO: task txg_quiesce:14810 blocked for more than 120 seconds.
  [ 1088.467913]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1088.467958] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1088.468010] txg_quiesce     D    0 14810      2 0x80000000
  [ 1088.468013] Call Trace:
  [ 1088.468020]  __schedule+0x24e/0x880
  [ 1088.468023]  schedule+0x2c/0x80
  [ 1088.468035]  cv_wait_common+0x11e/0x140 [spl]
  [ 1088.468039]  ? wait_woken+0x80/0x80
  [ 1088.468048]  __cv_wait+0x15/0x20 [spl]
  [ 1088.468124]  txg_quiesce_thread+0x2cb/0x3d0 [zfs]
  [ 1088.468193]  ? txg_delay+0x1b0/0x1b0 [zfs]
  [ 1088.468201]  thread_generic_wrapper+0x74/0x90 [spl]
  [ 1088.468204]  kthread+0x121/0x140
  [ 1088.468210]  ? __thread_exit+0x20/0x20 [spl]
  [ 1088.468213]  ? kthread_create_worker_on_cpu+0x70/0x70
  [ 1088.468217]  ret_from_fork+0x35/0x40
  [ 1088.468234] INFO: task zfs:28590 blocked for more than 120 seconds.
  [ 1088.468278]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1088.468322] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1088.468373] zfs             D    0 28590  28587 0x80000080
  [ 1088.468376] Call Trace:
  [ 1088.468379]  __schedule+0x24e/0x880
  [ 1088.468382]  schedule+0x2c/0x80
  [ 1088.468391]  cv_wait_common+0x11e/0x140 [spl]
  [ 1088.468396]  ? wait_woken+0x80/0x80
  [ 1088.468403]  __cv_wait+0x15/0x20 [spl]
  [ 1088.468459]  dmu_recv_stream+0xa51/0xef0 [zfs]
  [ 1088.468534]  zfs_ioc_recv_impl+0x306/0x1100 [zfs]
  [ 1088.468582]  ? dbuf_read+0x34a/0x920 [zfs]
  [ 1088.468631]  ? dbuf_rele+0x36/0x40 [zfs]
  [ 1088.468634]  ? _cond_resched+0x19/0x40
  [ 1088.468704]  zfs_ioc_recv_new+0x33d/0x410 [zfs]
  [ 1088.468714]  ? spl_kmem_alloc_impl+0xe5/0x1a0 [spl]
  [ 1088.468721]  ? spl_vmem_alloc+0x19/0x20 [spl]
  [ 1088.468729]  ? nv_alloc_sleep_spl+0x1f/0x30 [znvpair]
  [ 1088.468735]  ? nv_mem_zalloc.isra.0+0x2e/0x40 [znvpair]
  [ 1088.468740]  ? nvlist_xalloc.part.2+0x50/0xb0 [znvpair]
  [ 1088.468805]  zfsdev_ioctl+0x451/0x610 [zfs]
  [ 1088.468811]  do_vfs_ioctl+0xa8/0x630
  [ 1088.468815]  ? __audit_syscall_entry+0xbc/0x110
  [ 1088.468821]  ? syscall_trace_enter+0x1da/0x2d0
  [ 1088.468824]  SyS_ioctl+0x79/0x90
  [ 1088.468827]  do_syscall_64+0x73/0x130
  [ 1088.468831]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [ 1088.468834] RIP: 0033:0x7fc305a905d7
  [ 1088.468836] RSP: 002b:00007ffc45e39618 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
  [ 1088.468839] RAX: ffffffffffffffda RBX: 0000000000005a46 RCX: 
00007fc305a905d7
  [ 1088.468840] RDX: 00007ffc45e39630 RSI: 0000000000005a46 RDI: 
0000000000000006
  [ 1088.468842] RBP: 00007ffc45e39630 R08: 00007fc305d65e20 R09: 
0000000000000000
  [ 1088.468843] R10: 00005648313c7010 R11: 0000000000000246 R12: 
00007ffc45e3cc60
  [ 1088.468845] R13: 0000000000000006 R14: 00005648313cef10 R15: 
000000000000000c
  [ 1088.468853] INFO: task receive_writer:28685 blocked for more than 120 
seconds.
  [ 1088.468903]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1088.468948] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1088.469000] receive_writer  D    0 28685      2 0x80000080
  [ 1088.469002] Call Trace:
  [ 1088.469006]  __schedule+0x24e/0x880
  [ 1088.469009]  schedule+0x2c/0x80
  [ 1088.469018]  spl_panic+0xfa/0x110 [spl]
  [ 1088.469066]  ? arc_prune_task+0x1a/0x40 [zfs]
  [ 1088.469116]  ? dbuf_dirty+0x43d/0x850 [zfs]
  [ 1088.469120]  ? getrawmonotonic64+0x43/0xd0
  [ 1088.469123]  ? getrawmonotonic64+0x43/0xd0
  [ 1088.469178]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [ 1088.469182]  ? getrawmonotonic64+0x43/0xd0
  [ 1088.469234]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [ 1088.469237]  ? mutex_lock+0x12/0x40
  [ 1088.469286]  ? dbuf_rele_and_unlock+0x1a8/0x4b0 [zfs]
  [ 1088.469352]  range_tree_find_impl+0x88/0x90 [zfs]
  [ 1088.469360]  ? spl_kmem_zalloc+0xdc/0x1a0 [spl]
  [ 1088.469421]  range_tree_clear+0x4f/0x60 [zfs]
  [ 1088.469475]  dnode_free_range+0x11f/0x5a0 [zfs]
  [ 1088.469526]  dmu_object_free+0x53/0x90 [zfs]
  [ 1088.469575]  dmu_free_long_object+0x9f/0xc0 [zfs]
  [ 1088.469627]  receive_freeobjects.isra.12+0x7a/0x100 [zfs]
  [ 1088.469678]  receive_writer_thread+0x6d2/0xa60 [zfs]
  [ 1088.469681]  ? set_curr_task_fair+0x2b/0x60
  [ 1088.469689]  ? spl_kmem_free+0x33/0x40 [spl]
  [ 1088.469693]  ? kfree+0x165/0x180
  [ 1088.469740]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
  [ 1088.469747]  thread_generic_wrapper+0x74/0x90 [spl]
  [ 1088.469750]  kthread+0x121/0x140
  [ 1088.469756]  ? __thread_exit+0x20/0x20 [spl]
  [ 1088.469759]  ? kthread_create_worker_on_cpu+0x70/0x70
  [ 1088.469763]  ret_from_fork+0x35/0x40
  [ 1209.298375] INFO: task txg_quiesce:14810 blocked for more than 120 seconds.
  [ 1209.298429]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1209.298474] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1209.298526] txg_quiesce     D    0 14810      2 0x80000000
  [ 1209.298530] Call Trace:
  [ 1209.298536]  __schedule+0x24e/0x880
  [ 1209.298540]  schedule+0x2c/0x80
  [ 1209.298551]  cv_wait_common+0x11e/0x140 [spl]
  [ 1209.298556]  ? wait_woken+0x80/0x80
  [ 1209.298564]  __cv_wait+0x15/0x20 [spl]
  [ 1209.298644]  txg_quiesce_thread+0x2cb/0x3d0 [zfs]
  [ 1209.298713]  ? txg_delay+0x1b0/0x1b0 [zfs]
  [ 1209.298721]  thread_generic_wrapper+0x74/0x90 [spl]
  [ 1209.298724]  kthread+0x121/0x140
  [ 1209.298730]  ? __thread_exit+0x20/0x20 [spl]
  [ 1209.298733]  ? kthread_create_worker_on_cpu+0x70/0x70
  [ 1209.298738]  ret_from_fork+0x35/0x40
  [ 1209.298754] INFO: task zfs:28590 blocked for more than 120 seconds.
  [ 1209.298799]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1209.298843] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1209.298894] zfs             D    0 28590  28587 0x80000080
  [ 1209.298897] Call Trace:
  [ 1209.298900]  __schedule+0x24e/0x880
  [ 1209.298903]  schedule+0x2c/0x80
  [ 1209.298912]  cv_wait_common+0x11e/0x140 [spl]
  [ 1209.298916]  ? wait_woken+0x80/0x80
  [ 1209.298924]  __cv_wait+0x15/0x20 [spl]
  [ 1209.298981]  dmu_recv_stream+0xa51/0xef0 [zfs]
  [ 1209.299056]  zfs_ioc_recv_impl+0x306/0x1100 [zfs]
  [ 1209.299104]  ? dbuf_read+0x34a/0x920 [zfs]
  [ 1209.299151]  ? dbuf_rele+0x36/0x40 [zfs]
  [ 1209.299154]  ? _cond_resched+0x19/0x40
  [ 1209.299223]  zfs_ioc_recv_new+0x33d/0x410 [zfs]
  [ 1209.299232]  ? spl_kmem_alloc_impl+0xe5/0x1a0 [spl]
  [ 1209.299239]  ? spl_vmem_alloc+0x19/0x20 [spl]
  [ 1209.299247]  ? nv_alloc_sleep_spl+0x1f/0x30 [znvpair]
  [ 1209.299255]  ? nv_mem_zalloc.isra.0+0x2e/0x40 [znvpair]
  [ 1209.299261]  ? nvlist_xalloc.part.2+0x50/0xb0 [znvpair]
  [ 1209.299325]  zfsdev_ioctl+0x451/0x610 [zfs]
  [ 1209.299331]  do_vfs_ioctl+0xa8/0x630
  [ 1209.299334]  ? __audit_syscall_entry+0xbc/0x110
  [ 1209.299339]  ? syscall_trace_enter+0x1da/0x2d0
  [ 1209.299341]  SyS_ioctl+0x79/0x90
  [ 1209.299345]  do_syscall_64+0x73/0x130
  [ 1209.299349]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [ 1209.299352] RIP: 0033:0x7fc305a905d7
  [ 1209.299353] RSP: 002b:00007ffc45e39618 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
  [ 1209.299358] RAX: ffffffffffffffda RBX: 0000000000005a46 RCX: 
00007fc305a905d7
  [ 1209.299361] RDX: 00007ffc45e39630 RSI: 0000000000005a46 RDI: 
0000000000000006
  [ 1209.299362] RBP: 00007ffc45e39630 R08: 00007fc305d65e20 R09: 
0000000000000000
  [ 1209.299365] R10: 00005648313c7010 R11: 0000000000000246 R12: 
00007ffc45e3cc60
  [ 1209.299366] R13: 0000000000000006 R14: 00005648313cef10 R15: 
000000000000000c
  [ 1209.299375] INFO: task receive_writer:28685 blocked for more than 120 
seconds.
  [ 1209.299426]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1209.299471] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1209.299523] receive_writer  D    0 28685      2 0x80000080
  [ 1209.299525] Call Trace:
  [ 1209.299529]  __schedule+0x24e/0x880
  [ 1209.299532]  schedule+0x2c/0x80
  [ 1209.299541]  spl_panic+0xfa/0x110 [spl]
  [ 1209.299591]  ? arc_prune_task+0x1a/0x40 [zfs]
  [ 1209.299638]  ? dbuf_dirty+0x43d/0x850 [zfs]
  [ 1209.299644]  ? getrawmonotonic64+0x43/0xd0
  [ 1209.299647]  ? getrawmonotonic64+0x43/0xd0
  [ 1209.299703]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [ 1209.299707]  ? getrawmonotonic64+0x43/0xd0
  [ 1209.299759]  ? dmu_zfetch+0x49a/0x500 [zfs]
  [ 1209.299762]  ? mutex_lock+0x12/0x40
  [ 1209.299810]  ? dbuf_rele_and_unlock+0x1a8/0x4b0 [zfs]
  [ 1209.299875]  range_tree_find_impl+0x88/0x90 [zfs]
  [ 1209.299883]  ? spl_kmem_zalloc+0xdc/0x1a0 [spl]
  [ 1209.299944]  range_tree_clear+0x4f/0x60 [zfs]
  [ 1209.300000]  dnode_free_range+0x11f/0x5a0 [zfs]
  [ 1209.300052]  dmu_object_free+0x53/0x90 [zfs]
  [ 1209.300102]  dmu_free_long_object+0x9f/0xc0 [zfs]
  [ 1209.300153]  receive_freeobjects.isra.12+0x7a/0x100 [zfs]
  [ 1209.300203]  receive_writer_thread+0x6d2/0xa60 [zfs]
  [ 1209.300208]  ? set_curr_task_fair+0x2b/0x60
  [ 1209.300215]  ? spl_kmem_free+0x33/0x40 [spl]
  [ 1209.300219]  ? kfree+0x165/0x180
  [ 1209.300266]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
  [ 1209.300273]  thread_generic_wrapper+0x74/0x90 [spl]
  [ 1209.300278]  kthread+0x121/0x140
  [ 1209.300284]  ? __thread_exit+0x20/0x20 [spl]
  [ 1209.300287]  ? kthread_create_worker_on_cpu+0x70/0x70
  [ 1209.300291]  ret_from_fork+0x35/0x40
  [ 1330.129221] INFO: task txg_quiesce:14810 blocked for more than 120 seconds.
  [ 1330.129282]       Tainted: P           O     4.15.0-76-generic #86-Ubuntu
  [ 1330.129328] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
  [ 1330.129382] txg_quiesce     D    0 14810      2 0x80000000
  [ 1330.129387] Call Trace:
  [ 1330.129399]  __schedule+0x24e/0x880
  [ 1330.129403]  schedule+0x2c/0x80
  [ 1330.129420]  cv_wait_common+0x11e/0x140 [spl]
  [ 1330.129429]  ? wait_woken+0x80/0x80
  [ 1330.129437]  __cv_wait+0x15/0x20 [spl]
  [ 1330.129547]  txg_quiesce_thread+0x2cb/0x3d0 [zfs]
  [ 1330.129617]  ? txg_delay+0x1b0/0x1b0 [zfs]
  [ 1330.129625]  thread_generic_wrapper+0x74/0x90 [spl]
  [ 1330.129631]  kthread+0x121/0x140
  [ 1330.129638]  ? __thread_exit+0x20/0x20 [spl]
  [ 1330.129641]  ? kthread_create_worker_on_cpu+0x70/0x70
  [ 1330.129646]  ret_from_fork+0x35/0x40

  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-76-generic 4.15.0-76.86
  ProcVersionSignature: Ubuntu 4.15.0-76.86-generic 4.15.18
  Uname: Linux 4.15.0-76-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 28 13:31 seq
   crw-rw---- 1 root audio 116, 33 Jan 28 13:31 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 
'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Tue Jan 28 15:24:10 2020
  HibernationDevice: RESUME=UUID=d34df57d-ae32-4002-be2c-a25efa8678e4
  InstallationDate: Installed on 2016-04-04 (1394 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Beta amd64 
(20160325)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  MachineType: Supermicro SSG-6038R-E1CR16L
  PciMultimedia:
   
  ProcEnviron:
   TERM=rxvt-unicode-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 astdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-76-generic 
root=UUID=d1ab8bd8-41d5-4142-92d6-d0926539807b ro
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-76-generic N/A
   linux-backports-modules-4.15.0-76-generic  N/A
   linux-firmware                             1.173.14
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to bionic on 2018-08-16 (530 days ago)
  dmi.bios.date: 12/17/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2.0
  dmi.board.asset.tag: Default string
  dmi.board.name: X10DRH-iT
  dmi.board.vendor: Supermicro
  dmi.board.version: 1.01
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 1
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr2.0:bd12/17/2015:svnSupermicro:pnSSG-6038R-E1CR16L:pvr123456789:rvnSupermicro:rnX10DRH-iT:rvr1.01:cvnSupermicro:ct1:cvrDefaultstring:
  dmi.product.family: SMC X10
  dmi.product.name: SSG-6038R-E1CR16L
  dmi.product.version: 123456789
  dmi.sys.vendor: Supermicro

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