[Bug 105425] 3D & games produce periodic GPU crashes (Radeon R7 370)

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=105425

--- Comment #31 from iive@yahoo.com ---
(In reply to MirceaKitsune from comment #29)
> For the first time ever, I might finally have some very good news on this
> issue! It will take several more days to confirm, then possibly another
> month to pinpoint the exact option responsible. However it's possible I may
> have found something that finally gets rid of the crash.
> 
> The issue appears to go away when playing Xonotic with those parameters:
> 
> export LIBGL_DEBUG=true LIBGL_NO_DRAWARRAYS=true LIBGL_DRI3_DISABLE=true
> MESA_DEBUG=true MESA_NO_ASM=true MESA_NO_MMX=true MESA_NO_3DNOW=true
> MESA_NO_SSE=true MESA_NO_ERROR=true MESA_GLSL_CACHE_DISABLE=true
> MESA_NO_MINMAX_CACHE=true RADEON_NO_TCL=true DRAW_NO_FSE=true DRAW_USE_LLVM=0
> 
> I additionally disabled the cvar "r_shadows 2" which I forgot I had on for a
> while now, as it enabled a shadowing system that might have itself been the
> culprit.
> 
> With these two changes, I was able to clock up to 120 minutes of continuous
> gameplay last night, followed by an outstanding 200 minutes today! That's
> over 2 respectively 3 hours with no system freeze whatsoever. I need to
> repeat this test several times to be 100% sure there's not still some
> obscure chance of it happening, but in any case there is definitely a major
> difference visible.

"MESA_NO_ASM=true" supersedes the other "MESA_NO_MMX=true MESA_NO_3DNOW=true
MESA_NO_SSE=true", so you don't need to make combinations with all of them.


Also I don't see you testing `export mesa_glthread=false`. Race conditions are
one of the hardest bugs to catch and reproduce.

If you think that 'r_shadow' could quickly and "reliably" trigger a hang, then
I would ask you to focus on it first. 
1. Read about sysrq and make sure you have it enabled in the kernel and that it
works. Make sure you have text console, as it might need it.
2. Enable back "r_shadows 2"
3. Use apitrace to capture a hang, while playing the game.
4. Try to reboot gracefully, using sysrq to sync and reboot, or get in text
console and restart.
5. Test if the recorded trace could reproduce the crash reliably.

If the trace seems complete and it cannot reproduce the bug, then maybe it does
capture everything, but the bug is not simple infinite loop in the shader.
(These seem to be common cause of hangs).

If the bug can be reliably reproduced, it will be fixed.

Good luck.

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