[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

--- Comment #13 from Eero Tamminen <eero.t.tamminen at intel.com> ---
In can trigger also with smaller number of parallel media processes, 5 seems
enough:

# ps ax|grep -e ' Z' -e ' D'
   38 ?        DN     0:00 [khugepaged]
   41 ?        D      0:05 [kworker/u8:1+i9]
18218 ?        Zl   146:04 [sample_multi_tr] <defunct>
18219 ?        Zl     0:05 [sample_multi_tr] <defunct>
18221 ?        Zl     0:05 [sample_multi_tr] <defunct>
18225 ?        D      0:05 [sample_multi_tr]
18244 ?        D      0:05 [sample_multi_tr]
18415 ?        Ds     0:00 sample_multi_transcode -i::mpeg2
1920x1080i_29.97_20mb_mpeg2_high.mpv -o::h264 0024_HD17i7_1.0.h264 -b 6000 -u 7
-n 2400 -async 4 -hw

# for i in /proc/[0-9]*; do
    egrep '^(Name|State|Pid)' $i/status; cat $i/stack;
  done | grep -B1 -A4 "disk sleep"
Name:   sample_multi_tr
State:  D (disk sleep)
Pid:    18225
[<0>] drm_file_free.part.0+0x1c8/0x280
[<0>] drm_release+0x9c/0xd0
[<0>] __fput+0xae/0x200
--
Name:   sample_multi_tr
State:  D (disk sleep)
Pid:    18244
[<0>] __fput+0xae/0x200
[<0>] task_work_run+0x84/0xa0
[<0>] do_exit+0x308/0xba0
--
Name:   sample_multi_tr
State:  D (disk sleep)
Pid:    18415
[<0>] chrdev_open+0xa3/0x1b0
[<0>] do_dentry_open+0x1c4/0x380
[<0>] path_openat+0x564/0x11f0
--
Name:   khugepaged
State:  D (disk sleep)
Pid:    38
[<0>] kthread+0x113/0x130
[<0>] ret_from_fork+0x35/0x40
--
Name:   kworker/u8:1+i915
State:  D (disk sleep)
Pid:    41
[<0>] __i915_gem_free_work+0x5f/0x90 [i915]
[<0>] process_one_work+0x1e9/0x410
[<0>] worker_thread+0x2d/0x3d0

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