[Bug 84450] New: [SNB]igt/gem_concurrent_blit some subcases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84450

          Priority: medium
            Bug ID: 84450
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB]igt/gem_concurrent_blit some subcases fail
        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: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 107040
  --> https://bugs.freedesktop.org/attachment.cgi?id=107040&action=edit
dmesg

==System Environment==
--------------------------
Regression: No.
The tests always fail

Non-working platforms: SNB

==kernel==
--------------------------
origin/drm-intel-nightly:7101d84020f63f1da7e0c5d021cdd6be4d515de5(fails)
    drm-intel-nightly: 2014y-09m-25d-15h-14m-02s UTC integration manifest
origin/drm-intel-next-queued:7ca5a41f4da201371e131fc0641033652f76bf30(fails)
    drm/i915: Avoid re-configure panel on every PSR re-enable.
origin/drm-intel-fixes: c84db77010877da6c5da119868ed54c43d59e726(fails)
    drm/i915/hdmi: fix hdmi audio state readout


==Bug detailed description==
-----------------------------
igt/gem_concurrent_blit some subcases fail

Output:
[root at x-hnr9 tests]# ./gem_concurrent_blit --run-subtest
gpuX-rcs-gpu-read-after-write-interruptible
IGT-Version: 1.8-g32a0308 (x86_64) (Linux:
3.17.0-rc6_drm-intel-nightly_7101d8_20140929+ x86_64)
using 2x512 buffers, each 1MiB
Test assertion failure function cpu_cmp_bo, file gem_concurrent_blit.c:196:
Failed assertion: *vaddr++ == val
Last errno: 11, Resource temporarily unavailable
error: 0xabcdabed != 0xabcdabcd
Subtest gpuX-rcs-gpu-read-after-write-interruptible: FAIL (6.652s)
[root at x-hnr9 tests]# ./gem_concurrent_blit --run-subtest
gpuX-rcs-gpu-read-after-write
IGT-Version: 1.8-g32a0308 (x86_64) (Linux:
3.17.0-rc6_drm-intel-nightly_7101d8_20140929+ x86_64)
using 2x512 buffers, each 1MiB
Test assertion failure function cpu_cmp_bo, file gem_concurrent_blit.c:196:
Failed assertion: *vaddr++ == val
Last errno: 11, Resource temporarily unavailable
error: 0xab8dabcd != 0xabcdabcd
Subtest gpuX-rcs-gpu-read-after-write: FAIL (5.936s)



==Reproduce steps==
---------------------------- 
1. ./gem_concurrent_blit --run-subtest
gpuX-rcs-gpu-read-after-write-interruptible

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