[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 #18 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Eero Tamminen from comment #17)
> So far the smallest set of tests with which I've managed to reproduce the
> freeze is this set of tests (in this order):
[...]

I have slightly smaller test-case, with freeze reproducibility of about 1/3:
1. Start Ubuntu 18.04 with X/Unity & latest git gfx/media stack
2. Run large number of Wayland test cases which fail immediately at start
   because there's no Wayland. I don't think these are relevant, but if some
   of them briefly open window before exiting, it does exercise i915
3. Run 3x 7 (very heavy / low FPS) windowed GPU bandwidth tests
4. Run 3x 8 different FFmpeg QSV (=using MediaSDK) transcode operations,
   alternating betwee multiple processes (parallel process count being from
   5 to 50) and single transcode process versions of them
5. Run same things as in 4), but using MediaSDK (transcode sample app) directly

In some of these 1/3 freeze occurrences, freezing happens in step 3), sometimes
in step 4).

After Media freeze, reboot seems stuck at shutdown, device needs to be
power-cycled.

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