[Bug 87429] New: [SNB]igt/gem_reset_stats/ban-ctx-render causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87429

            Bug ID: 87429
           Summary: [SNB]igt/gem_reset_stats/ban-ctx-render causes system
                    hang
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression: No(Only failed on nightly branch).

Non-working platforms: SNB

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_17(fails)
origin/drm-intel-next-queued:e2c719b75c8c186deb86570d8466df9e9eff919b(works)
    drm/i915: tame the chattermouth (v2)
origin/drm-intel-fixes: b0616c5306b342ceca07044dbc4f917d95c4f825(works)
    drm/i915: Unlock panel even when LVDS is disabled
origin/drm-next: 4e0cd68115620bc3236ff4e58e4c073948629b41(works)
    drm: sti: fix module compilation issue
origin/drm-fixes: 3e3282c0a23d8eb9438dcf4ac908a5eb48c7038b(works)
    Merge tag 'drm-intel-fixes-2014-12-04' of
git://anongit.freedesktop.org/drm-intel into drm-fixes

==Bug detailed description==
-----------------------------
igt/gem_reset_stats/ban-ctx-render causes system hang, the failure only occurs
on nightly branch. Because system hang, unable to catch dmesg.

==Reproduce steps==
---------------------------- 
1. ./gem_reset_stats --run-subtest ban-render

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