[Bug 87477] New: [BDW Regression]igt/gem_close_race/process-exit causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87477

            Bug ID: 87477
           Summary: [BDW Regression]igt/gem_close_race/process-exit 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: Yes.
Good commit on -next-queued:
372ee59699d9704086dadb084209542d10e28851(2014_12_01)

Non-working platforms: BDW

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_19(fails)
origin/drm-intel-next-queued:140fd38dc4962ae3694f81900b51c567df1b6d33(fails)
    drm/i915: Hold runtime PM during plane commit
origin/drm-intel-fixes: b0616c5306b342ceca07044dbc4f917d95c4f825(works)
    drm/i915: Unlock panel even when LVDS is disabled

==Bug detailed description==
-----------------------------
igt/gem_close_race/process-exit causes system hang. Because system hang, unable
to catch dmesg.

==Reproduce steps==
---------------------------- 
1. ./gem_close_race --run-subtest process-exit


./gem_close_race --run-subtest process-exit

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