[Bug 81703] New: [BYT Regression]igt/kms_plane some subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81703

          Priority: high
            Bug ID: 81703
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]igt/kms_plane 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

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(fails)
    drm/i915: Allow overlapping userptr objects  
origin/drm-intel-fixes: eedd10f45bdcb2a5b2afa35f845e080c3bc984f2(works)
    drm/i915: Simplify i915_gem_release_all_mmaps()

==Bug detailed description==
-----------------------------
"WARNING: CPU: 1 PID: 1234 at drivers/gpu/drm/i915/intel_dp.c:1184
igt/kms_plane some subcases cause system hang

Output:
root at x-bytm02:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./kms_plane
IGT-Version: 1.7-g70e6ed9 (x86_64) (Linux:
3.16.0-rc4_drm-intel-next-queued_2b8ee5_20140724+ x86_64)
Testing connector eDP-1 using pipe A plane 1

Reproduce steps:
-------------------------
1. ./kms_plane

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