My computer had some very unhappy times just now, while I was using it,
where it did not respond to mouse or keyboard for minutes. I saw via my
i3bar that it went from 700-ish megabytes of free memory to 2.6
gigabytes of free memory. These are the entries from dmesg after it
recovered:

[629656.318431] INFO: task Xorg:4451 blocked for more than 120 seconds.
[629656.318440]       Tainted: P           O      5.4.0-196-generic #216-Ubuntu
[629656.318443] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
[629656.318447] Xorg            D    0  4451   4406 0x00000084
[629656.318453] Call Trace:
[629656.318467]  __schedule+0x2e3/0x740
[629656.318474]  ? kfree_skbmem+0x4e/0x90
[629656.318480]  schedule+0x42/0xb0
[629656.318485]  schedule_preempt_disabled+0xe/0x10
[629656.318489]  __mutex_lock.isra.0+0x172/0x4c0
[629656.318498]  __mutex_lock_slowpath+0x13/0x20
[629656.318502]  mutex_lock+0x2e/0x40
[629656.318607]  __i915_gem_free_objects+0x73/0x1a0 [i915]
[629656.318695]  i915_gem_flush_free_objects+0x1d/0x20 [i915]
[629656.318783]  i915_gem_create_ioctl+0x1d/0x40 [i915]
[629656.318866]  ? i915_gem_dumb_create+0xb0/0xb0 [i915]
[629656.318903]  drm_ioctl_kernel+0xae/0xf0 [drm]
[629656.318934]  drm_ioctl+0x24a/0x3f0 [drm]
[629656.319016]  ? i915_gem_dumb_create+0xb0/0xb0 [i915]
[629656.319024]  ? ___sys_recvmsg+0x88/0xc0
[629656.319031]  ? timerqueue_add+0x68/0xb0
[629656.319040]  ? enqueue_hrtimer+0x43/0xa0
[629656.319048]  do_vfs_ioctl+0x407/0x670
[629656.319054]  ? __audit_syscall_entry+0xdb/0x120
[629656.319060]  ksys_ioctl+0x67/0x90
[629656.319065]  __x64_sys_ioctl+0x1a/0x20
[629656.319073]  do_syscall_64+0x57/0x190
[629656.319080]  entry_SYSCALL_64_after_hwframe+0x61/0xc6
[629656.319085] RIP: 0033:0x7f2fa401a5cb
[629656.319095] Code: Bad RIP value.
[629656.319099] RSP: 002b:00007ffe5e18fa08 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
[629656.319103] RAX: ffffffffffffffda RBX: 000055c547d18290 RCX: 
00007f2fa401a5cb
[629656.319106] RDX: 00007ffe5e18fa50 RSI: 00000000c010645b RDI: 
0000000000000011
[629656.319108] RBP: 00007ffe5e18fae0 R08: 000055c5484ff200 R09: 
000055c547c5d022
[629656.319110] R10: 000055c547c5d010 R11: 0000000000000246 R12: 
0000000000000000
[629656.319112] R13: 000055c547d182a8 R14: 00007ffe5e18fa50 R15: 
000055c547d182b0
[629656.319311] INFO: task kworker/u16:7:3226844 blocked for more than 120 
seconds.
[629656.319317]       Tainted: P           O      5.4.0-196-generic #216-Ubuntu
[629656.319320] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
[629656.319323] kworker/u16:7   D    0 3226844      2 0x80004080
[629656.319415] Workqueue: i915 __i915_gem_free_work [i915]
[629656.319418] Call Trace:
[629656.319425]  __schedule+0x2e3/0x740
[629656.319432]  schedule+0x42/0xb0
[629656.319436]  schedule_preempt_disabled+0xe/0x10
[629656.319441]  __mutex_lock.isra.0+0x172/0x4c0
[629656.319451]  ? __pm_runtime_resume+0x60/0x80
[629656.319457]  __mutex_lock_slowpath+0x13/0x20
[629656.319461]  mutex_lock+0x2e/0x40
[629656.319539]  __i915_gem_free_objects+0x73/0x1a0 [i915]
[629656.319615]  __i915_gem_free_work+0x21/0x30 [i915]
[629656.319621]  process_one_work+0x1eb/0x3b0
[629656.319626]  worker_thread+0x4d/0x400
[629656.319634]  kthread+0x104/0x140
[629656.319638]  ? process_one_work+0x3b0/0x3b0
[629656.319643]  ? kthread_park+0x90/0x90
[629656.319649]  ret_from_fork+0x1f/0x40
[629674.524803] Purging GPU memory, 134196 pages freed, 8256 pages still 
pinned, 1 pages left available.
[866218.047519] mce: CPU5: Core temperature above threshold, cpu clock 
throttled (total events = 429)
[866218.047520] mce: CPU1: Core temperature above threshold, cpu clock 
throttled (total events = 429)
[866218.047521] mce: CPU7: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047522] mce: CPU3: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047523] mce: CPU1: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047524] mce: CPU5: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047574] mce: CPU4: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047575] mce: CPU0: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047576] mce: CPU6: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.047576] mce: CPU2: Package temperature above threshold, cpu clock 
throttled (total events = 763)
[866218.048556] mce: CPU1: Core temperature/speed normal
[866218.048556] mce: CPU5: Core temperature/speed normal
[866218.048557] mce: CPU3: Package temperature/speed normal
[866218.048557] mce: CPU7: Package temperature/speed normal
[866218.048558] mce: CPU5: Package temperature/speed normal
[866218.048559] mce: CPU1: Package temperature/speed normal
[866218.048609] mce: CPU6: Package temperature/speed normal
[866218.048610] mce: CPU0: Package temperature/speed normal
[866218.048610] mce: CPU2: Package temperature/speed normal
[866218.048611] mce: CPU4: Package temperature/speed normal
[868651.737607] sctp: Hash tables configured (bind 256/256)
[886544.836485] INFO: task txg_sync:1271 blocked for more than 120 seconds.
[886544.836494]       Tainted: P           O      5.4.0-196-generic #216-Ubuntu
[886544.836497] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables 
this message.
[886544.836503] txg_sync        D    0  1271      2 0x80004000
[886544.836509] Call Trace:
[886544.836526]  __schedule+0x2e3/0x740
[886544.836536]  ? __internal_add_timer+0x2d/0x40
[886544.836544]  schedule+0x42/0xb0
[886544.836552]  schedule_timeout+0x8a/0x160
[886544.836561]  ? __next_timer_interrupt+0xe0/0xe0
[886544.836568]  io_schedule_timeout+0x1e/0x50
[886544.836588]  __cv_timedwait_common+0x15e/0x1c0 [spl]
[886544.836597]  ? __wake_up_pollfree+0x40/0x40
[886544.836613]  __cv_timedwait_io+0x19/0x20 [spl]
[886544.836813]  zio_wait+0x11e/0x230 [zfs]
[886544.836990]  ? __raw_spin_unlock+0x9/0x10 [zfs]
[886544.837161]  dsl_pool_sync+0xbc/0x410 [zfs]
[886544.837364]  spa_sync_iterate_to_convergence+0xe0/0x1c0 [zfs]
[886544.837533]  spa_sync+0x312/0x5b0 [zfs]
[886544.837705]  txg_sync_thread+0x27a/0x310 [zfs]
[886544.837895]  ? txg_dispatch_callbacks+0x100/0x100 [zfs]
[886544.837916]  thread_generic_wrapper+0x83/0xa0 [spl]
[886544.837925]  kthread+0x104/0x140
[886544.837941]  ? clear_bit+0x20/0x20 [spl]
[886544.837946]  ? kthread_park+0x90/0x90
[886544.837954]  ret_from_fork+0x1f/0x40
[886594.499181] Purging GPU memory, 175226 pages freed, 8256 pages still 
pinned, 1 pages left available.


Given the timestamps, I'm going to guess this happened before, when I wasn't 
around, and it recovered on its own, before I saw it in action.

Thanks

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https://bugs.launchpad.net/bugs/2083638

Title:
  overnight crashes

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