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    SubjectRe: "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@fieldses.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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