[Bug 73958] New: [BDW]igt/gem_close_race causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73958

          Priority: high
            Bug ID: 73958
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]igt/gem_close_race causes system hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: critical
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 92637
  --> https://bugs.freedesktop.org/attachment.cgi?id=92637&action=edit
dmesg

System Environment:
--------------------------
Platform: Broadwell
Kernel(drm-intel-nightly)83ac01f486397fd8d319a3e31d1f95beb05037c5

Bug detailed description:
-------------------------
New case gem_close_race's subcases gem-close-race and process-exit causes
system.
Run on Broadwell with -nightly kernel.

run ./gem_close_race --run-subtest process-exit
output:
IGT-Version: 1.5-g1bbb607 (x86_64) (Linux:
3.13.0-rc8_drm-intel-nightly_83ac01_20140123+ x86_64)

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

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