[Bug 86959] New: [IVB/SNB/BDW Regression]igt/gem_reset_stats some subcases causes system hang sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86959

            Bug ID: 86959
           Summary: [IVB/SNB/BDW Regression]igt/gem_reset_stats some
                    subcases causes system hang sporadically
           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: Yes.
Good commit on -next-queued:
65fa5f773196ccc88c4aae43ece9119f092c20a6(2014_11_26), I tried 10 times, doesn't
causes system hang.

Non-working platforms: IVB SNB BDW

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_03(fails)
origin/drm-intel-next-queued:d06cced8fa81d56e56ab34e93a83236b151c2a76(fails)
    drm/i915: Move init_unused_rings to gem_init_hw
origin/drm-intel-fixes: b0616c5306b342ceca07044dbc4f917d95c4f825(works)
    drm/i915: Unlock panel even when LVDS is disabled

==Bug detailed description==
-----------------------------
igt/gem_reset_stats some subcases causes system hang sporadically, the fail
rate about 1 out of 5

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

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