[Bug 85834] New: [BDW]igt/gem_linear_blits/interruptible sporadically takes more than 10 minutes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85834

            Bug ID: 85834
           Summary: [BDW]igt/gem_linear_blits/interruptible sporadically
                    takes more than 10 minutes
           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 108871
  --> https://bugs.freedesktop.org/attachment.cgi?id=108871&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure 
Non-working platforms: BDW

==kernel==
--------------------------
drm-intel-nightly/203b34bf78a127a85cf89bbd8cf4decd935d780f

==Bug detailed description==
It sporadically takes more than 10 minutes. Run 4 cycles, it happens on the 4th
cycle.

igt/gem_linear_blits/normal also has this issue.

output:
root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_linear_blits --run-subtest interruptible
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_782baf_20141104+ x86_64)
not enough RAM to run test, reducing buffer count
Using 3487 1MiB buffers
Verifying initialisation...
Cyclic blits, forward...
Cyclic blits, backward...
Random blits...
Subtest interruptible: SUCCESS (15.324s)

real    0m15.326s
user    0m3.729s
sys     0m5.247s

root at x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_linear_blits --run-subtest interruptible
IGT-Version: 1.8-ge622850 (x86_64) (Linux:
3.18.0-rc3_drm-intel-nightly_782baf_20141104+ x86_64)
not enough RAM to run test, reducing buffer count
Using 3487 1MiB buffers
Verifying initialisation...
Cyclic blits, forward...
Cyclic blits, backward...
Random blits...

==Reproduce steps==
---------------------------- 
1. time ./gem_linear_blits --run-subtest interruptible

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