[Bug 81864] New: [PNV Regression]igt/kms_flip some subcases causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81864

          Priority: high
            Bug ID: 81864
          Keywords: bisect_pending
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [PNV Regression]igt/kms_flip some subcases 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

Created attachment 103627
  --> https://bugs.freedesktop.org/attachment.cgi?id=103627&action=edit
dmesg

==System Environment==
--------------------------
Regression: Yes. 
Good commit on -next-queued: 91565c85b66db820f01894a971d39aaef60c4325(here has
another bug 80704)

Non-working platforms: PNV

==kernel==
--------------------------
origin/drm-intel-nightly: 608e8cf58f0c125093664d452d6d297991feb6c7(fails)
    drm-intel-nightly: 2014y-07m-28d-17h-29m-13s integration manifest
origin/drm-intel-next-queued: 98fcc935e2f2f5de04ec8957312dc26a94371ae7(fails)
    work around warning in i915_gem_gtt
origin/drm-intel-fixes: f4be89cecea437aaddd7700d05c6bdb5678041f7(here has
another bug 80704)
    drm/i915: Fix crash when failing to parse MIPI VBT

==Bug detailed description==
igt/kms_flip some subcases causes system hang.

Case list:
igt/kms_flip/rcs-flip-vs-dpms
igt/kms_flip/rcs-flip-vs-modeset
igt/kms_flip/wf_vblank-vs-modeset-interruptible

Output:
[root at x-pnv2 tests]# time ./kms_flip --run-subtest rcs-flip-vs-dpms
IGT-Version: 1.7-ge48c495 (i686) (Linux:
3.16.0-rc4_drm-intel-next-queued_98fcc9_20140729+ i686)
^Z^C


^C


==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest rcs-flip-vs-dpms

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