[Bug 81663] New: [BYT Regression]igt/kms_fbc_crc some subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81663

          Priority: high
            Bug ID: 81663
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]igt/kms_fbc_crc some subcases cause
                    system hang
        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

==System Environment==
--------------------------
Regression: Yes

Good commit on -next-queued: 91565c85b66db820f01894a971d39aaef60c4325
the result on this commit is skip.

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: d62845db2ec40e15a76e5d5ebfe1a039ea2538c4(fails)
    drm-intel-nightly: 2014y-07m-22d-17h-58m-03s integration manifest
origin/drm-intel-next-queued: 1dd7389e898de2b7ceb90054fd96e4c3329b77ef(fails)
    drm/i915: Replace HAS_PCH_SPLIT which incorrectly lets some platforms in   
origin/drm-intel-fixes: a0d036b074b4a5a933e37fcb9bdd6b3cc80a0387(skips)
    drm/i915: Reorder the semaphore deadlock check, again

==Bug detailed description==
-----------------------------
igt/kms_fbc_crc some subcases cause system hang

Because system hang, unable to get dmesg.

Output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./kms_fbc_crc --run-subtest blt
IGT-Version: 1.7-g4d4f4b2 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_d62845_20140723+ x86_64)

Beginning blt on pipe A, connector eDP-1
FBC not enabled


Reproduce steps:
-------------------------
1../kms_fbc_crc --run-subtest blt

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