[Bug 81704] New: [BYT Regression]igt/kms_pipe_crc_basic causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81704

          Priority: high
            Bug ID: 81704
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]igt/kms_pipe_crc_basic causes 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 drm-next: 8d4ad9d4bb0a618c975a32d77087694ec6336f68

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: af1aaba219fdd90ca1b30f9b8d8d19352224f170(fails)
    drm-intel-nightly: 2014y-07m-23d-20h-15m-10s integration manifest
origin/drm-intel-next-queued: 2b8ee5710915a244b807fbe3427299d007d19e89(works)
    drm/i915: Allow overlapping userptr objects  
origin/drm-intel-fixes: eedd10f45bdcb2a5b2afa35f845e080c3bc984f2(works)
    drm/i915: Simplify i915_gem_release_all_mmaps()
origin/drm-fixes: ec8a362f2e6e380e7a1f66a6c9a7f6c237ab3520(works)
    Merge branch 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux
into drm-fixes
origin/drm-mext:78660d5fb03f5d0e6a880dcd704702fd364d93f3(fails)
    Merge branch 'component-for-drm' of
git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next

==Bug detailed description==
-----------------------------
igt/kms_pipe_crc_basic causes system hang

Output:
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time
./kms_pipe_crc_basic
IGT-Version: 1.7-g70e6ed9 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_af1aab_20140724_debug+ x86_64)
Subtest bad-pipe: SUCCESS
Subtest bad-source: SUCCESS
Subtest bad-nb-words-1: SUCCESS
Subtest bad-nb-words-3: SUCCESS
read-crc-pipe-A: Testing connector eDP-1 using pipe A



Reproduce steps:
-------------------------
1. ./kms_pipe_crc_basic

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