[Bug 203033] New: nouveau hung task

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203033

            Bug ID: 203033
           Summary: nouveau hung task
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.0.0
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: mcroce at redhat.com
        Regression: No

The GUI freezes randomly with nouveau with this error in the syslog:

INFO: task kworker/u16:4:14755 blocked for more than 120 seconds.
      Not tainted 5.0.0-matteo #28
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u16:4   D    0 14755      2 0x80000000
Workqueue: events_unbound nv50_disp_atomic_commit_work [nouveau]
Call Trace:
 ? __schedule+0x1a6/0x6c0
 schedule+0x2c/0x70
 schedule_timeout+0x268/0x380
 ? nvif_notify_get+0x94/0xa0 [nouveau]
 dma_fence_default_wait+0x204/0x270
 ? dma_fence_release+0x90/0x90
 dma_fence_wait_timeout+0xdd/0x100
 drm_atomic_helper_wait_for_fences+0x3a/0xc0 [drm_kms_helper]
 nv50_disp_atomic_commit_tail+0x7c/0x850 [nouveau]
 ? __switch_to_asm+0x34/0x70
 ? __switch_to_asm+0x40/0x70
 ? __switch_to_asm+0x40/0x70
 ? __switch_to_asm+0x40/0x70
 process_one_work+0x1fa/0x400
 worker_thread+0x2d/0x3d0
 ? process_one_work+0x400/0x400
 kthread+0x113/0x130
 ? kthread_create_on_node+0x60/0x60
 ret_from_fork+0x35/0x40

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