[Bug 98104] [!semaphore] Gpu hang recovery fails, causing reset loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98104

--- Comment #5 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Eero Tamminen from comment #4)
> So far, I've seen this issue only on GEN9+, with Mesa GPU hangs in GfxBench
> 4.0 CarChase offscreen (gl_4_off) GL 4.3 test-case.

Yes, but the failure is not specific to that. It just depends on having one
engine wait on a fence (that is either another engine without semaphores
enabled, or an external fence from another driver) for long enough that it
accrues hangcheck's anger. In your case, we have the blitter waiting on the
render engine that is hung and hangcheck considers them both hung. As it is
likely that the render engine made some forward progress (instdone) whilst the
blitter was idle waiting, the blitter gets blamed first for the render hang.

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