linux-kernel - Re: "Hangcheck timer elapsed... GPU hung" in 3.8.0-rc2

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Date:	Sun, 6 Jan 2013 19:06:52 +0100
From:	Daniel Vetter <daniel@...ll.ch>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Josh Boyer <jwboyer@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: "Hangcheck timer elapsed... GPU hung" in 3.8.0-rc2

On Thu, Jan 03, 2013 at 06:11:23PM -0500, J. Bruce Fields wrote:
> On Thu, Jan 03, 2013 at 04:16:24PM -0500, Josh Boyer wrote:
> > On Thu, Jan 3, 2013 at 3:46 PM, J. Bruce Fields <bfields@...ldses.org> wrote:
> > > I got a crash after a few minutes of running 3.8.0-rc2, was able to
> > > switch to a vt and look at dmesg:
> > >
> > >   [  490.962545] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
> > >   [  490.963019] [drm] capturing error event; look for more information in /debug/dri/0/i915_error_state
> > >   [  492.961446] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU hung
> > >   [  492.965613] [drm:i915_reset] *ERROR* GPU hanging too fast, declaring wedged!
> > >   [  492.965621] [drm:i915_reset] *ERROR* Failed to reset chip.
> > >
> > > Previously I was on 3.6.10-2.fc17.x86_64, which didn't have any such
> > > problem.
> > 
> > I'm not questioning that you haven't seen that error in F17, but we have
> > had quite a few bug reports with similar error messages for a while now.
> > Apparently there are lots of ways GPUs can get hung, so they might be
> > different from what you're seeing.  Just wanted to point out that it
> > might not be a new 3.8 change that caused it.
> 
> OK, sure.  It reproduced very quickly after the upgrade, so I assumed it
> was a regression.
> 
> I'm running 3.7.0 now which hasn't shown any problem.
> 
> I'll try a newer kernel again to see if it's really that easy for me to
> reproduce.

If you hit this again (even better if you have a way to reproduce) please
grab the i915_error_state file from debugfs and file a bug on
bugs.freedesktop.org against DRM - DRI (Intel). We do know of a few recent
issues introduced around 3.7 kernels, preliminary patches are floating
around. The error state should be good enough to decide whether you're
hitting the same issues.

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