Re: i915: GPU hang

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On Tue, Dec 18, 2012 at 12:15 AM, Heinz Diehl <htd@xxxxxxxxxxxxxxxxx> wrote:
>> [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
>> [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
>> [drm:i915_reset] *ERROR* Failed to reset chip.
>
> I have the same problem, are able to reproduce it and have bisected
> it, but the commit which git --bisect identified seems not to be the
> cause.
>
> root@wildsau linux-git]# git bisect good
> 6c085a728cf000ac1865d66f8c9b52935558b328 is the first bad commit
> commit 6c085a728cf000ac1865d66f8c9b52935558b328
> Author: Chris Wilson <ch...@xxxxxxxxxxxxxxxxxx>
> Date:   Mon Aug 20 11:40:46 2012 +0200
>
>     drm/i915: Track unbound pages

Note that Guennadi is running kernel 3.5 which does not contain that
patch - generally there are billions of ways to hang your gpu, so
every gpu hang needs it's own bug (until we've analyzed the
error_state and triaged the bug taking other evidence into account).
Also, this is on a different gpu generation, so even more likely that
it's a different kind of hang.

Thanks, Daniel


-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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