[Bug 83340] New: [HSW]igt/gem_reset_stats sporadically causes system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83340

          Priority: medium
            Bug ID: 83340
                CC: intel-gfx-bugs at lists.freedesktop.org,
                    jinxianx.guo at intel.com
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW]igt/gem_reset_stats sporadically causes system
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 105539
  --> https://bugs.freedesktop.org/attachment.cgi?id=105539&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, unstable
Non-working platforms: HSW

==kernel==
--------------------------
drm-intel-nightly/6e9c5b9d428bb075293ec865ba58f90931187a48
drm-intel-fixes/bbe1c2740d3a25aa1dbe5d842d2ff09cddcdde0a
drm-intel-next-queued/c101c5b635bee54e43d0732473d2f80b2a0e00f4


==Bug detailed description==
It sporadically causes system hang, Run 5 cycles, it happens at the 5th cycle.
It happens on HSW with drm-intel-nightly, drm-intel-fixes and
rm-intel-next-queued kernel.

output:
IGT-Version: 1.7-gd0a41b4 (x86_64) (Linux:
3.17.0-rc2_drm-intel-nightly_6e9c5b_20140901+ x86_64)
Subtest params: SUCCESS
Subtest params-ctx-render: SUCCESS
Subtest reset-stats-render: SUCCESS

Reproduce steps:
---------------------------- 
1. run ./gem_reset_stats 5 cycles.

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