[Bug 81638] New: [BYT]igt/gem_concurrent_blit some subcases unable to exit sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81638

          Priority: medium
            Bug ID: 81638
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT]igt/gem_concurrent_blit some subcases unable to
                    exit sporadically
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jinxianx.guo at intel.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 103269
  --> https://bugs.freedesktop.org/attachment.cgi?id=103269&action=edit
dmesg

==System Environment==
--------------------------
Regression: Not sure 

The fail rate less than 1/10

==kernel==
--------------------------
origin/drm-intel-nightly: 411fa8b275ee903df6c07976af4eebe5815646a4(fails)
    drm-intel-nightly: 2014y-07m-21d-19h-30m-33s integration manifest
origin/drm-intel-next-queued: 941d281bd115d1c73773901585c85bc81989f8fa(doesn't
meet in 5 times)
    drm/i915: Avoid incorrect returning for some platforms   
origin/drm-intel-fixes: a0d036b074b4a5a933e37fcb9bdd6b3cc80a0387(doesn't meet
in 5 times)
    drm/i915: Reorder the semaphore deadlock check, again

==Bug detailed description==
-----------------------------
igt/gem_concurrent_blit some subcases unable to exit sporadically

Case list:
igt/gem_concurrent_blit/cpu-early-read-forked
igt/gem_concurrent_blit/cpu-gpu-read-after-write-forked
igt/gem_concurrent_blit/cpu-overwrite-source-forked
igt/gem_concurrent_blit/gtt-early-read-forked
igt/gem_concurrent_blit/gtt-gpu-read-after-write-forked
igt/gem_concurrent_blit/gtt-overwrite-source-forked
igt/gem_concurrent_blit/prw-early-read-forked
igt/gem_concurrent_blit/prw-gpu-read-after-write-forked
igt/gem_concurrent_blit/prw-overwrite-source-forked

Output:
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./gem_concurrent_blit --run-subtest cpu-early-read-forked
IGT-Version: 1.7-g4d4f4b2 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_411fa8_20140722_debug+ x86_64)
using 2x512 buffers, each 1MiB
^Z
[1]+  Stopped                 ./gem_concurrent_blit --run-subtest
cpu-early-read-forked

real    17m19.413s
user    0m0.000s
sys     0m0.002s

Reproduce steps:
-------------------------
1. time ./gem_concurrent_blit --run-subtest cpu-early-read-forked

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