[Bug 57136] [GM45 regression] GPU hang during disk io

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57136

--- Comment #14 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #13)
> Created attachment 72011 [details]
> tar.gz containing output of 'dmesg', Xorg.0.log, /var/gdm/:0*.log, empty
> i915_error_state
> 
> I applied the patch suggested above and built a Fedora kernel,
> kernel-3.7.0-6.local.fc19.x86_64.
> 
> I then booted that kernel and drove excessive I/O load on my Thinkpad X200:
> I ran 'digikam', qemu-kvm of a Win7 image configured to use 2 cores, cat a
> 'cat BIGFILES >/dev/null'.
> 
> While the system didn't crash until I got all the above running, it did
> hang/crash.
> 
> This crash, I could not recover /system/kernel/debug/dri/0/i915_error_state:
> I got a 'page allocation failure' when I attempted to copy it.

Drat. Can't verify that the hang is the same as we are hunting without the
error-state, but from the scenario it should be. So (as expected) we can assume
that this is contradictory evidence that the patch is a sufficient workaround.

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