9449887.046967] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9449887.061668]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9449887.075642] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9449887.091725] receive_writer  D    0  2314      2 0x80000000
[9449887.091727] Call Trace:
[9449887.091731]  __schedule+0x291/0x8a0
[9449887.091733]  schedule+0x2c/0x80
[9449887.091737]  cv_wait_common+0x11e/0x140 [spl]
[9449887.091753]  ? wait_woken+0x80/0x80
[9449887.091756]  __cv_wait+0x15/0x20 [spl]
[9449887.091772]  bqueue_dequeue+0x46/0xe0 [zfs]
[9449887.091787]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9449887.091791]  ? set_curr_task_fair+0x2b/0x60
[9449887.091794]  ? spl_kmem_free+0x33/0x40 [spl]
[9449887.091797]  ? kfree+0x165/0x180
[9449887.091812]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9449887.091815]  thread_generic_wrapper+0x74/0x90 [spl]
[9449887.091818]  kthread+0x121/0x140
[9449887.091822]  ? __thread_exit+0x20/0x20 [spl]
[9449887.091823]  ? kthread_create_worker_on_cpu+0x70/0x70
[9449887.091825]  ? kthread_create_worker_on_cpu+0x70/0x70
[9449887.091826]  ret_from_fork+0x35/0x40
[9450007.883297] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9450007.898027]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9450007.912019] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9450007.928138] receive_writer  D    0  2314      2 0x80000000
[9450007.928140] Call Trace:
[9450007.928144]  __schedule+0x291/0x8a0
[9450007.928145]  schedule+0x2c/0x80
[9450007.928150]  cv_wait_common+0x11e/0x140 [spl]
[9450007.928166]  ? wait_woken+0x80/0x80
[9450007.928168]  __cv_wait+0x15/0x20 [spl]
[9450007.928185]  bqueue_dequeue+0x46/0xe0 [zfs]
[9450007.928200]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9450007.928205]  ? set_curr_task_fair+0x2b/0x60
[9450007.928208]  ? spl_kmem_free+0x33/0x40 [spl]
[9450007.928211]  ? kfree+0x165/0x180
[9450007.928228]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9450007.928233]  thread_generic_wrapper+0x74/0x90 [spl]
[9450007.928237]  kthread+0x121/0x140
[9450007.928241]  ? __thread_exit+0x20/0x20 [spl]
[9450007.928244]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450007.928246]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450007.928247]  ret_from_fork+0x35/0x40
[9450128.719687] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9450128.734419]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9450128.748411] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9450128.764581] receive_writer  D    0  2314      2 0x80000000
[9450128.764582] Call Trace:
[9450128.764586]  __schedule+0x291/0x8a0
[9450128.764588]  schedule+0x2c/0x80
[9450128.764593]  cv_wait_common+0x11e/0x140 [spl]
[9450128.764609]  ? wait_woken+0x80/0x80
[9450128.764612]  __cv_wait+0x15/0x20 [spl]
[9450128.764632]  bqueue_dequeue+0x46/0xe0 [zfs]
[9450128.764649]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9450128.764653]  ? set_curr_task_fair+0x2b/0x60
[9450128.764657]  ? spl_kmem_free+0x33/0x40 [spl]
[9450128.764659]  ? kfree+0x165/0x180
[9450128.764673]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9450128.764677]  thread_generic_wrapper+0x74/0x90 [spl]
[9450128.764681]  kthread+0x121/0x140
[9450128.764698]  ? __thread_exit+0x20/0x20 [spl]
[9450128.764700]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450128.764702]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450128.764705]  ret_from_fork+0x35/0x40
[9450249.555926] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9450249.570663]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9450249.584654] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9450249.600841] receive_writer  D    0  2314      2 0x80000000
[9450249.600842] Call Trace:
[9450249.600846]  __schedule+0x291/0x8a0
[9450249.600847]  schedule+0x2c/0x80
[9450249.600852]  cv_wait_common+0x11e/0x140 [spl]
[9450249.600854]  ? wait_woken+0x80/0x80
[9450249.600871]  __cv_wait+0x15/0x20 [spl]
[9450249.600887]  bqueue_dequeue+0x46/0xe0 [zfs]
[9450249.600902]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9450249.600906]  ? set_curr_task_fair+0x2b/0x60
[9450249.600909]  ? spl_kmem_free+0x33/0x40 [spl]
[9450249.600912]  ? kfree+0x165/0x180
[9450249.600939]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9450249.600942]  thread_generic_wrapper+0x74/0x90 [spl]
[9450249.600944]  kthread+0x121/0x140
[9450249.600946]  ? __thread_exit+0x20/0x20 [spl]
[9450249.600948]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450249.600949]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450249.600951]  ret_from_fork+0x35/0x40
[9450370.391726] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9450370.406475]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9450370.420464] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9450370.436583] receive_writer  D    0  2314      2 0x80000000
[9450370.436585] Call Trace:
[9450370.436590]  __schedule+0x291/0x8a0
[9450370.436591]  schedule+0x2c/0x80
[9450370.436596]  cv_wait_common+0x11e/0x140 [spl]
[9450370.436597]  ? wait_woken+0x80/0x80
[9450370.436600]  __cv_wait+0x15/0x20 [spl]
[9450370.436633]  bqueue_dequeue+0x46/0xe0 [zfs]
[9450370.436648]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9450370.436653]  ? set_curr_task_fair+0x2b/0x60
[9450370.436655]  ? spl_kmem_free+0x33/0x40 [spl]
[9450370.436658]  ? kfree+0x165/0x180
[9450370.436672]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9450370.436674]  thread_generic_wrapper+0x74/0x90 [spl]
[9450370.436677]  kthread+0x121/0x140
[9450370.436679]  ? __thread_exit+0x20/0x20 [spl]
[9450370.436681]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450370.436683]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450370.436684]  ret_from_fork+0x35/0x40
[9450491.227583] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9450491.242320]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9450491.256313] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9450491.272517] receive_writer  D    0  2314      2 0x80000000
[9450491.272518] Call Trace:
[9450491.272522]  __schedule+0x291/0x8a0
[9450491.272523]  schedule+0x2c/0x80
[9450491.272528]  cv_wait_common+0x11e/0x140 [spl]
[9450491.272530]  ? wait_woken+0x80/0x80
[9450491.272547]  __cv_wait+0x15/0x20 [spl]
[9450491.272567]  bqueue_dequeue+0x46/0xe0 [zfs]
[9450491.272584]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9450491.272588]  ? set_curr_task_fair+0x2b/0x60
[9450491.272592]  ? spl_kmem_free+0x33/0x40 [spl]
[9450491.272595]  ? kfree+0x165/0x180
[9450491.272609]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9450491.272626]  thread_generic_wrapper+0x74/0x90 [spl]
[9450491.272629]  kthread+0x121/0x140
[9450491.272631]  ? __thread_exit+0x20/0x20 [spl]
[9450491.272632]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450491.272633]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450491.272635]  ret_from_fork+0x35/0x40
[9450612.063616] INFO: task receive_writer:2314 blocked for more than 120 seconds.
[9450612.078359]       Tainted: P           O     4.15.0-45-generic #48-Ubuntu
[9450612.092350] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[9450612.108538] receive_writer  D    0  2314      2 0x80000000
[9450612.108539] Call Trace:
[9450612.108543]  __schedule+0x291/0x8a0
[9450612.108544]  schedule+0x2c/0x80
[9450612.108549]  cv_wait_common+0x11e/0x140 [spl]
[9450612.108551]  ? wait_woken+0x80/0x80
[9450612.108568]  __cv_wait+0x15/0x20 [spl]
[9450612.108584]  bqueue_dequeue+0x46/0xe0 [zfs]
[9450612.108599]  receive_writer_thread+0x9f/0x9f0 [zfs]
[9450612.108604]  ? set_curr_task_fair+0x2b/0x60
[9450612.108607]  ? spl_kmem_free+0x33/0x40 [spl]
[9450612.108610]  ? kfree+0x165/0x180
[9450612.108636]  ? receive_free.isra.13+0xc0/0xc0 [zfs]
[9450612.108640]  thread_generic_wrapper+0x74/0x90 [spl]
[9450612.108642]  kthread+0x121/0x140
[9450612.108645]  ? __thread_exit+0x20/0x20 [spl]
[9450612.108646]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450612.108648]  ? kthread_create_worker_on_cpu+0x70/0x70
[9450612.108649]  ret_from_fork+0x35/0x40
[9453090.548432] mysqld[1179]: segfault at 20 ip 00007f6ace9ccfa0 sp 00007f6abc392058 error 4 in libpthread-2.27.so[7f6ace9c3000+1a000]
[9453187.021207] mysqld[3064]: segfault at 20 ip 00007f4b2c724fa0 sp 00007f4b1c0e0058 error 4 in libpthread-2.27.so[7f4b2c71b000+1a000]
[15546307.773469] database[19305]: segfault at 0 ip 00007fc3c27c51b0 sp 00007ffc63bb7bc0 error 4 in libc-2.27.so[7fc3c2780000+1e7000]
[15546313.360551] database[19425]: segfault at 0 ip 00007f2957d311b0 sp 00007ffd91832990 error 4 in libc-2.27.so[7f2957cec000+1e7000]
[15546329.472369] database[19541]: segfault at 0 ip 00007f0cb898b1b0 sp 00007ffcd977f8b0 error 4 in libc-2.27.so[7f0cb8946000+1e7000]
[15546342.257788] database[19605]: segfault at 0 ip 00007f9d90aa61b0 sp 00007fffdf248d60 error 4 in libc-2.27.so[7f9d90a61000+1e7000]