[Bug 99036] [BYT] Unable to purge GPU memory due lock contention.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99036

            Bug ID: 99036
           Summary: [BYT] Unable to purge GPU memory due lock contention.
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: mark.a.janes at intel.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

BYT intermittently report the following dmesg error when executing piglit:

   Unable to purge GPU memory due lock contention.

Subsequently, the machine fails other GPU test suites, and eventually
hard-hangs.

I've performed hundreds of piglit runs on byt to reproduce this intermittent
issue.  The earliest I have seen it is:

029e8ff81c65c2e0562be4a5d93fe83a9df49233
radv: Initialize the shader_stats_dump flag.

It's likely that this is triggered by a i965 commit just prior to 029e8ff.  I
will continue to test in an attempt to identify the regression more precisely.

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