On Wed, Dec 14, 2011 at 02:47:33 +0100, Daniel Vetter wrote:
> On Mon, Dec 12, 2011 at 10:16, Rocko Requin <rockorequin@hotmail.com> wrote:
> >> If you can wire up netconsole you should be able to gather the full
> >> backtrace and that would be really useful. Otherwise can you please
> >> confirm by reverting that commit from your current tree that it is
> >> indeed the culprit? Otherwise please bisect the issue.
> >
> > I built 3.2-rc5 with the patch from commit
> > eb1711bb94991e93669c5a1b5f84f11be2d51ea1 reversed, and have been using it
> > now for a day and a half without any i915_gem issues. So at this stage it
> > does seem likely it is the culprit, based on the fact that I had at least 2
> > and probably 3 i915_gem crashes in around 12 hours with the commit applied.
> > When I get some free time I'll reapply the patch and see if I can reproduce
> > the crash and get a netconsole dump.
> 
> Backtraces from another reporter seriously look like we're hitting
> some ugly use-after free. Can you please test whether the patch
> "drm/i915: Only clear the GPU domains upon a successful finish" by
> Chris Wilson fixes anything for you? You can grab it from
> http://cgit.freedesktop.org/~danvet/drm/patch/?id=389a55581e30607af0fcde6cdb4e54f189cf46cf

Hi,

it looks I stumbled over the same:

[88399.844150] kernel BUG at drivers/gpu/drm/i915/i915_gem.c:1952!
2011-12-14_19:28:56.93083 <0>[88399.844182] invalid opcode: 0000 [#1]
SMP 

While doing this I was running a 32 bit photo software (Bibble 5 pro)
in fullscreen on an otherwise 64 bit system.

The full log including the trace is attached.

I'll try with the patch applied.

Regards,
Tino