[Bugme-new] [Bug 20452] New: Clarkdale: kernel BUG at drivers/gpu/drm/i915/i915_gem_evict.c:244!

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=20452

           Summary: Clarkdale: kernel BUG at
                    drivers/gpu/drm/i915/i915_gem_evict.c:244!
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.36-rc8
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - Intel)
        AssignedTo: drivers_video-dri-intel at kernel-bugs.osdl.org
        ReportedBy: marogge at onlinehome.de
        Regression: Yes


Created an attachment (id=33792)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=33792)
Syslog

Due to various i915 display related issues on a couple of machines (GM45, i3
Clarkdale) I am frequently updating and testing parts of the i915 stack.

With some of the latest user space cpomponents (xorg 1.8.2, libdrm-2.4.22,
mesa-7.9, xf86-video-intel-2.13.0, pixman-0.19.4, cairo-1.10.0) I now hit a
sporadic display freeze that leaves a trace in the syslog. Unfortunately I
cannot really bisect due to the sporadicness. 

I logged two different symptoms in the attached system log. 

The first one was less severe, allowed me to switch to a virtual terminal. I
could kill and restart X, although the display remained black and I had to
reboot. The log has a lot of lines of the form
[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
[drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting
7527114 at 7527108)
The kernel was a BFS-modified 2.6.35.4.

The second incident (for which this ticket is created) happened under a vanilla
2.6.36-rc8 kernel. The symptom was harder. I could not switch to virtual
terminals but I could ssh in. Interestingly the system did not react to kill -9
of the X server ie. the process list remained unchanged (X and all children in
state S). I had to reboot. Main characteristics in the log is the kernel BUG
and stack trace.

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