https://bugs.freedesktop.org/show_bug.cgi?id=100567

--- Comment #24 from kenorb-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org ---
Happened another 3 times.

Logs and stack traces:
- https://gist.github.com/kenorb/9e6537747630f72bf7cc4a5afcc288a7
- https://gist.github.com/kenorb/0e85a737488ad8c294d70dd83d2bcd13
- https://gist.github.com/kenorb/abb9db39b04b9fd551429c79c6750883

Call Trace:
 __schedule+0x29e/0x840
 schedule+0x2c/0x80
 schedule_timeout+0x258/0x360
 ? nv50_wndw_atomic_destroy_state+0x1d/0x20 [nouveau]
 dma_fence_default_wait+0x1fc/0x260
 ? dma_fence_release+0xa0/0xa0
 dma_fence_wait_timeout+0x3e/0xf0
 drm_atomic_helper_wait_for_fences+0x3f/0xc0 [drm_kms_helper]
 nv50_disp_atomic_commit_tail+0x78/0x860 [nouveau]
 ? __switch_to_asm+0x40/0x70
 ? __switch_to_asm+0x34/0x70
 nv50_disp_atomic_commit_work+0x12/0x20 [nouveau]
 process_one_work+0x20f/0x3c0
 worker_thread+0x34/0x400
 kthread+0x120/0x140
 ? pwq_unbound_release_workfn+0xd0/0xd0
 ? kthread_bind+0x40/0x40
 ret_from_fork+0x35/0x40

Workqueue: events_unbound nv50_disp_atomic_commit_work [nouveau]
Call Trace:
 __schedule+0x29e/0x840
 ? nvkm_ioctl_ntfy_get+0x5c/0x80 [nouveau]
 schedule+0x2c/0x80
 schedule_timeout+0x258/0x360
 ? nvif_object_ioctl+0x47/0x50 [nouveau]
 ? nouveau_bo_rd32+0x2a/0x30 [nouveau]
 ? nv84_fence_read+0x2c/0x30 [nouveau]
 ? nouveau_fence_no_signaling+0x2a/0x90 [nouveau]
 dma_fence_default_wait+0x1fc/0x260
 ? dma_fence_release+0xa0/0xa0
 dma_fence_wait_timeout+0x3e/0xf0
 drm_atomic_helper_wait_for_fences+0x3f/0xc0 [drm_kms_helper]
 nv50_disp_atomic_commit_tail+0x78/0x860 [nouveau]
 ? __switch_to_asm+0x40/0x70
 ? __switch_to_asm+0x34/0x70
 nv50_disp_atomic_commit_work+0x12/0x20 [nouveau]
 process_one_work+0x20f/0x3c0
 worker_thread+0x34/0x400
 kthread+0x120/0x140
 ? pwq_unbound_release_workfn+0xd0/0xd0
 ? kthread_bind+0x40/0x40
 ret_from_fork+0x35/0x40
INFO: task kworker/u72:1:35901 blocked for more than 120 seconds.
      Tainted: G        W  O      4.18.0-13-generic #14-Ubuntu

INFO: task Xorg:5761 blocked for more than 120 seconds.
      Tainted: G           O      4.18.0-13-generic #14-Ubuntu
Xorg            D    0  5761   5759 0x00000004
Call Trace:
 __schedule+0x29e/0x840
 ? kfree+0x15b/0x180
 schedule+0x2c/0x80
 schedule_preempt_disabled+0xe/0x10
 __ww_mutex_lock.isra.6+0x3c1/0x660
 __ww_mutex_lock_slowpath+0x16/0x20
 ww_mutex_lock+0x34/0x50
 drm_modeset_lock+0x6e/0xb0 [drm]
 drm_crtc_get_sequence_ioctl+0xbc/0x190 [drm]
 ? drm_wait_vblank_ioctl+0x610/0x610 [drm]
 drm_ioctl_kernel+0xa4/0xf0 [drm]
 drm_ioctl+0x227/0x400 [drm]
 ? drm_wait_vblank_ioctl+0x610/0x610 [drm]
 ? ep_modify+0x160/0x160
 nouveau_drm_ioctl+0x73/0xc0 [nouveau]
 do_vfs_ioctl+0xa8/0x620
 ? __sys_recvmsg+0x88/0xa0
 ksys_ioctl+0x67/0x90
 __x64_sys_ioctl+0x1a/0x20
 do_syscall_64+0x5a/0x110
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f8bb9f703c7
Code: Bad RIP value.
RSP: 002b:00007ffd077cc868 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffd077cc900 RCX: 00007f8bb9f703c7
RDX: 00007ffd077cc8a0 RSI: 00000000c018643b RDI: 000000000000000e
RBP: 00007ffd077cc8a0 R08: 0000000000000000 R09: 000055aba56d3850
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c018643b
R13: 000000000000000e R14: 000055aba5402c30 R15: 000055aba531dcb0
INFO: task kworker/u72:1:8681 blocked for more than 120 seconds.
      Tainted: G           O      4.18.0-13-generic #14-Ubuntu

INFO: task kworker/u72:3:14273 blocked for more than 120 seconds.
      Tainted: G           O      4.18.0-13-generic #14-Ubuntu
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u72:3   D    0 14273      2 0x80000000
Workqueue: events_unbound nv50_disp_atomic_commit_work [nouveau]
Call Trace:
 __schedule+0x29e/0x840
 schedule+0x2c/0x80
 schedule_timeout+0x258/0x360
 ? nv50_wndw_atomic_destroy_state+0x1d/0x20 [nouveau]
 dma_fence_default_wait+0x1fc/0x260
 ? dma_fence_release+0xa0/0xa0
 dma_fence_wait_timeout+0x3e/0xf0
 drm_atomic_helper_wait_for_fences+0x3f/0xc0 [drm_kms_helper]
 nv50_disp_atomic_commit_tail+0x78/0x860 [nouveau]
 ? __switch_to_asm+0x40/0x70
 ? __switch_to_asm+0x34/0x70
 nv50_disp_atomic_commit_work+0x12/0x20 [nouveau]
 process_one_work+0x20f/0x3c0
 worker_thread+0x34/0x400
 kthread+0x120/0x140
 ? pwq_unbound_release_workfn+0xd0/0xd0
 ? kthread_bind+0x40/0x40
 ret_from_fork+0x35/0x40

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