[Bug 87024] New: [BYT]igt/drm_import_export causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87024

            Bug ID: 87024
           Summary: [BYT]igt/drm_import_export causes system hang
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression: Not sure.
I didn't find good commit on both kernel and igt. I will investigte it later.

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_02(fails)
origin/drm-intel-next-queued:6c930688cb04e81ca71092baf585f7ea1c670368(fails)
    drm/i915/skl: Update the DDI translation values for DP/eDP 1.3
origin/drm-intel-fixes: b0616c5306b342ceca07044dbc4f917d95c4f825(fails)
    drm/i915: Unlock panel even when LVDS is disabled

==Bug detailed description==
-----------------------------
igt/drm_import_export causes system hang.

Because system hang, unable to get dmesg. And here nothing output on the screen

Output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests#
./drm_import_export
IGT-Version: 1.8-ga535cde (x86_64) (Linux:
3.18.0-rc7_drm-intel-nightly_691817_20141202+ x86_64)



==Reproduce steps==
---------------------------- 
1. ./drm_import_export

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