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    SubjectRe: kernel BUG at drivers/gpu/drm/i915/i915_gem
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    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

    Thanks, Daniel



    --
    Daniel Vetter
    daniel.vetter@ffwll.ch - +41 (0) 79 365 57 48 - http://blog.ffwll.ch


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