[Bug 64094] New: Hang causing EQ overflow

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=64094

          Priority: medium
            Bug ID: 64094
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Hang causing EQ overflow
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: luto at mit.edu
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 78667
  --> https://bugs.freedesktop.org/attachment.cgi?id=78667&action=edit
Xorg log

This is a regression that happened somewhere between Ubuntu 12.04 and Ubuntu
13.04.  The package versions are linux-image-3.8.0-19-generic 3.8.0-19.29, 
server-xorg-core 1.13.3-0ubuntu6, and xserver-xorg-video-intel 2.21.6-0ubuntu4.
 This is x86_64.


The graphics device is:

00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller [8086:0102] (rev 09)

I'm seeing frequency (~1x/day) complete hangs of X.  Switching VTs and
switching back partially fixes it, but graphics are a little bit glitchy
afterwards (in particular, emacs leaves little bits of its caret all over).

dmesg says:

[ 4331.543286] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed... GPU
hung
[ 4331.543290] [drm] capturing error event; look for more information in
/debug/dri/0/i915_error_state


Xorg says:

(EE) [mi] EQ overflowing.  Additional events will be discarded until existing
events are processed.

Full logs and error state are attached.

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