[Bug 110848] Everything using GPU gets stuck after running+killing parallel Media loads (after running 3D benchmarks)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110848

Eero Tamminen <eero.t.tamminen at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #144476|0                           |1
        is obsolete|                            |

--- Comment #8 from Eero Tamminen <eero.t.tamminen at intel.com> ---
Created attachment 144520
  --> https://bugs.freedesktop.org/attachment.cgi?id=144520&action=edit
Kernel stacks for all tasks when the problem happens

(In reply to Eero Tamminen from comment #7)
> I've now verified that every time this freeze happens, these are stuck:
> -----------------------------------------------
> Name:	khugepaged
> State:	D (disk sleep)
> Pid:	38
> [<0>] kthread+0x113/0x130
> [<0>] ret_from_fork+0x35/0x40
> --
> Name:	kworker/u8:2+i915
> State:	D (disk sleep)
> Pid:	7911
> [<0>] __i915_gem_free_work+0x5f/0x90 [i915]
> [<0>] process_one_work+0x1e9/0x410
> [<0>] worker_thread+0x2d/0x3d0
> [<0>] kthread+0x113/0x130
> [<0>] ret_from_fork+0x35/0x40
> -----------------------------------------------
> 
> in addition to the stuck transcoding tasks:
[...]

Today, there was no frozen khugepaged, just these:
-----------------------------------------------
Name:   kworker/u8:0+i915
State:  D (disk sleep)
Pid:    7194
[<0>] __i915_gem_free_work+0x5f/0x90 [i915]
[<0>] process_one_work+0x1e9/0x410
[<0>] worker_thread+0x2d/0x3d0
[<0>] kthread+0x113/0x130
[<0>] ret_from_fork+0x35/0x40
...
Name:   ffmpeg
State:  D (disk sleep)
Pid:    9407
[<0>] drm_file_free.part.0+0x1c8/0x280
[<0>] drm_release+0x9c/0xd0
[<0>] __fput+0xae/0x200
[<0>] task_work_run+0x84/0xa0
[<0>] do_exit+0x308/0xba0
[<0>] do_group_exit+0x33/0xa0
[<0>] get_signal+0x121/0x910
[<0>] do_signal+0x30/0x6b0
[<0>] exit_to_usermode_loop+0x96/0xb0
[<0>] do_syscall_64+0x103/0x130
[<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
-----------------------------------------------

In addition to the earlier listed transcode processes stuck at fput() and
chrdev_open().  See attachment.

=> I assume khugepaged stuff isn't related to the issue, it was just innocent
bystander.

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