[Bug 104297] [i965] Downward causes GPU hangs and misrendering on Haswell

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104297

--- Comment #14 from Darius Spitznagel <d.spitznagel at goodbytez.de> ---
Good news Ken,

as of today the GPU hangs are much less severe.
I think its because of Brian Pauls recent GLSL patches which landed in mesa
master.

Especially I think this one...
glsl: disable vec3 packing/splitting in tfb separate mode
(6e5b882339e9128348f0e7b828230f07338fce55)

The GPU hang error changed from...
[  690.105553] [drm] GPU HANG: ecode 7:0:0x87d57d10, in Downward [2633],
reason: Hang on rcs0, action: reset

to...
[ 1415.920704] [drm] GPU HANG: ecode 7:0:0x85dffffc, in glretrace [1052],
reason: Hang on render ring, action: reset

The failed "Failed to submit batchbuffer: Invalid argument" error still happens
sometimes, misrendering ist persistent and still no statebuffer growing in
replay output.

Currently I run an endless loop replaying the trace to check if the replay
kills my desktop session which it did yesterday a couple of times.

I will run this test for an hour and then also apply your patch from Comment 11
and report back.

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