[Bug 86962] New: [HSW Regression]igt/kms_flip/vblank-vs-hang causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86962

            Bug ID: 86962
           Summary: [HSW Regression]igt/kms_flip/vblank-vs-hang 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: Yes.
Good commit on -next-queued:
65fa5f773196ccc88c4aae43ece9119f092c20a6(2014_11_26)

Non-working platforms: HSW

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_03(fails)
origin/drm-intel-next-queued:d06cced8fa81d56e56ab34e93a83236b151c2a76(fails)
    drm/i915: Move init_unused_rings to gem_init_hw
origin/drm-intel-fixes: b0616c5306b342ceca07044dbc4f917d95c4f825(works)
    drm/i915: Unlock panel even when LVDS is disabled

==Bug detailed description==
-----------------------------
igt/kms_flip/vblank-vs-hang causes system hang.

Because system hang, unable to catch dmesg 

Output:
[root at x-hsw27 tests]# ./kms_flip --run-subtest vblank-vs-hang
IGT-Version: 1.8-g4e5c16c (x86_64) (Linux:
3.18.0-rc7_drm-intel-nightly_691817_20141202+ x86_64)
Using monotonic timestamps
Beginning vblank-vs-hang on crtc 8, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
.............................................................
vblank-vs-hang on crtc 8, connector 18: PASSED

Beginning vblank-vs-hang on crtc 12, connector 18
  1024x768 60 1024 1048 1184 1344 768 771 777 806 0xa 0x40 65000
....................................................Test assertion failure
function wait_for_events, file kms_flip.c:1171:
Failed assertion: ret > 0
select timed out or error (ret 0)
Subtest vblank-vs-hang: FAIL (21.814s)
Warning on condition flags != 0 in fucntion check_stop_rings, file
drmtest.c:112
i915_ring_stop flags on exit 0x400000ff, can't quiescent gpu cleanly

Write failed: Broken pipe


==Reproduce steps==
---------------------------- 
1. ./kms_flip --run-subtest vblank-vs-hang

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