[Bug 90057] New: [BDW]igt/gem_ppgtt/blt-vs-render-ctx0 sporadically doesn't exit testing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90057

            Bug ID: 90057
           Summary: [BDW]igt/gem_ppgtt/blt-vs-render-ctx0 sporadically
                    doesn't exit testing
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115137
  --> https://bugs.freedesktop.org/attachment.cgi?id=115137&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure

Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/d600654ab94b325f253e267422dcf60302120ea0
commit d600654ab94b325f253e267422dcf60302120ea0
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Thu Apr 16 17:54:10 2015 +0200

    drm-intel-nightly: 2015y-04m-16d-15h-53m-28s UTC integration manifest

==Bug detailed description==
-----------------------------
It sporadically doesn't exit testing. It works well at the 1st cycle and fails
at he 2nd cycle.

output:
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time ./gem_ppgtt
--run-subtest blt-vs-render-ctx0
IGT-Version: 1.10-gbeddb3b (x86_64) (Linux:
4.0.0_drm-intel-nightly_d60065_20150417+ x86_64)
Subtest blt-vs-render-ctx0: SUCCESS (30.853s)

real    0m30.882s
user    0m15.809s
sys     0m53.543s
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time ./gem_ppgtt
--run-subtest blt-vs-render-ctx0
IGT-Version: 1.10-gbeddb3b (x86_64) (Linux:
4.0.0_drm-intel-nightly_d60065_20150417+ x86_64)

^C^C^C^C^C^C


==Reproduce steps==
---------------------------- 
1. time ./gem_ppgtt --run-subtest blt-vs-render-ctx0

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