[Bug 108820] [SKL] (recoverable) GPU hangs in benchmarks using compute shaders with drm-tip v4.19+ kernels

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108820

--- Comment #37 from Eero Tamminen <eero.t.tamminen at intel.com> ---
(In reply to Mark Janes from comment #36)
> Should this be blocking the Mesa 19.0 release?

At least it started happening for us after the previous release.

Because of bug 108787 caused by Meson, I started to wonder whether Meson is
another possible cause for this (I started to see the random hangs sometime
after switching to Meson).

Jakub, are you building Mesa with Meson (like me) or Autotools?


> Why wouldn't we suspect a bug in drm-tip instead of Mesa?

Somebody needs to:

* bisect Jakub's 2 fully reproducible compute shader test-case to find out
whether they're same issue or not, and whether they are Mesa or kernel issues

* look into attached i915 error files to check whether Jakub's fully
reproducible compute hangs, and my very rarely happening CarChase hangs have
the same cause.  I.e. should there be separate bugs for these

* Ask for new bugs to be filed where applicable and move them to drm-tip, if
they're kernel issues

(If those rare CarChase hangs match neither of Jakub's reproducible compute
hang cases, and i915 error file isn't enough to locate the problem, that
particular issue can't be located / debugged and probably needs to be wontfix,
it's nowadays so rare.)

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