[Bug 72508] New: [SNB] Glxgears frozen with gnome-session when pressure test

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72508

          Priority: medium
            Bug ID: 72508
          Assignee: chris at chris-wilson.co.uk
           Summary: [SNB] Glxgears frozen with gnome-session when pressure
                    test
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jianx.zhou at intel.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

System Environment:       
----------------------------------------------------------------------
Platform: SNB (Fedora19)
Kernel: 3.12.2
Libdrm: (master)libdrm-2.4.49
Mesa: (10.0)724c07ff1288cebda9a009ca5a72bae5b51e1062
Xserver:(server-1.14-branch)xorg-server-1.14.4
Xf86_video_intel: (master)2.99.906
Cairo:(master)8e11a42e3e9b679dce97ac45cd8b47322536a253
Libva:(master)88ed1ebe960b1c4a7970e12f8df1ed7d7031352a
Libva_intel_driver:(master)4a0f76c5b706fccbc85fadaeee9d785cd7b57d5a

Bug detailed description:
------------------------------------------------------------------------
Glxgears frozen with gnome-session when running by 50~90 circle on fedora19,It 
Works ok on Raw X, The problem doesn’t exist on upstream. Please see Xorg.0.log
and dmesg.log.
This problem reproduced probability is low in Q3, often reproduced in Q4.

Xf86 performance
--------------------------------------------------------------------
Test 100glxgears.sh on SNB
git- 9a8478d  :good
git- 7468a6b :bad



Reproduce steps:
--------------------------------------------------------------------
1.    xinit&
2.    gnome-session
3.    
declare -i K=1
while [ $K -le 100 ]
do
       echo $K
        glxgears &
        K=$K+1
        sleep 1
done
killall glxgears

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