[Bug 84855] New: [ILK Regression]igt kms_rotation_crc/sprite-rotatio causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84855

            Bug ID: 84855
           Summary: [ILK Regression]igt kms_rotation_crc/sprite-rotatio
                    causes system hang
           Product: DRI
           Version: XOrg CVS
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: high
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org,
                    jinxianx.guo at intel.com

Created attachment 107643
  --> https://bugs.freedesktop.org/attachment.cgi?id=107643&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: 6e47e3f097cc6c4cb470a805a3fa07a8e8376dab
bad commit: a128efeaa64609a9672b51bb37bb703e1b0f0128

==kernel==
--------------------------
drm-intel-nightly/ea4bec8e96ea8b33b49a7892c1c7f20041a56da6

==Bug detailed description==
It causes system hang on ILK with -nightly and -queued kernel,works well on
-fixes kernel.

output:
IGT-Version: 1.8-gc7551bf (i686) (Linux:
3.17.0-rc5_drm-intel-next-queued_a128ef_20141010+ i686)

==Reproduce steps==
---------------------------- 
1. ./kms_rotation_crc --run-subtest sprite-rotation

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