[Bug 81662] New: [BYT Regression]igt/kms_flip some subcases cause system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81662

          Priority: high
            Bug ID: 81662
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT Regression]igt/kms_flip 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 drm-next: ca5a1b9ba0fb5291b555a23b76dbe5f6c30bfd7a

Non-working platforms: BYT

==kernel==
--------------------------
origin/drm-intel-nightly: d62845db2ec40e15a76e5d5ebfe1a039ea2538c4(fails)
    drm-intel-nightly: 2014y-07m-22d-17h-58m-03s integration manifest
origin/drm-intel-next-queued: 1dd7389e898de2b7ceb90054fd96e4c3329b77ef(Another
failed Bug 81367)
    drm/i915: Replace HAS_PCH_SPLIT which incorrectly lets some platforms in   
origin/drm-intel-fixes: a0d036b074b4a5a933e37fcb9bdd6b3cc80a0387(Another failed
Bug 81367)
    drm/i915: Reorder the semaphore deadlock check, again
origin/drm-fixes: ec8a362f2e6e380e7a1f66a6c9a7f6c237ab3520(Another failed Bug
81367)
    Merge branch 'drm-fixes-3.16' of git://people.freedesktop.org/~agd5f/linux
into drm-fixes
origin/drm-next: 7296c849bf2eca2bd7d34a4686a53e3089150ac1(fails)
    drm/i915: fix build without fbdev.

==Bug detailed description==
-----------------------------
igt/kms_flip some subcases cause system hang

Because system hang, unable to get dmesg.

Output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time ./kms_flip
--run-subtest 2x-absolute-wf_vblank
IGT-Version: 1.7-g4d4f4b2 (x86_64) (Linux:
3.16.0-rc6_drm-intel-nightly_d62845_20140723+ x86_64)
Using monotonic timestamps
Beginning 2x-absolute-wf_vblank on crtc 7:12, connector 27:15
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
  1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
.....................................................................................................................................................................................
2x-absolute-wf_vblank on crtc 7:12, connector 27:15: PASSED

Subtest 2x-absolute-wf_vblank: SUCCESS
Write failed: Broken pipe


Reproduce steps:
-------------------------
1. ./kms_flip --run-subtest 2x-absolute-wf_vblank

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