[Bug 77908] New: [IVB Regression]Subcases dpms-vs-vblank-race-interruptible and modeset-vs-vblank-race of kms_flip fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77908

          Priority: medium
            Bug ID: 77908
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [IVB Regression]Subcases
                    dpms-vs-vblank-race-interruptible and
                    modeset-vs-vblank-race of kms_flip fail
        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 97929
  --> https://bugs.freedesktop.org/attachment.cgi?id=97929&action=edit
dmesg

System Environment:
--------------------------
Platform: IVB
kernel:   (drm-intel-fixes) 58b87a391d67e35e3aa1fc6c80890b491d73ad46

Bug detailed description:
----------------------------
Subcases dpms-vs-vblank-race-interruptible and modeset-vs-vblank-race of
kms_flip fail on latest -fixes(58b87a391d67e35e3aa1fc6c80890b491d73ad46).

It's a regression bug:
good commit: b6842feb63a23a6a988f4e1ffb93408d8ff6931e
bad commit:  58b87a391d67e35e3aa1fc6c80890b491d73ad46

we will bisect it later

output on -fixes kernel:
./kms_flip --run-subtest modeset-vs-vblank-race
IGT-Version: 1.6-g78e4c2b (x86_64) (Linux:
3.15.0-rc2_drm-intel-fixes_58b87a_20140424_debug+ x86_64)
Using monotonic timestamps
Beginning modeset-vs-vblank-race on crtc 5, connector 16
  1920x1200 60 1920 1968 2000 2080 1200 1203 1209 1235 0x9 0x48 154000
Test assertion failure function run_test_step, file kms_flip.c:901:
Last errno: 22, Invalid argument
Failed assertion: __wait_for_vblank(TEST_VBLANK_BLOCK, o->pipe, 1, 0, &reply)
== 0
Subtest modeset-vs-vblank-race: FAIL


Reproduce steps:
---------------------------- 

1. ./kms_flip --run-subtest dpms-vs-vblank-race-interruptible
   or
   ./kms_flip --run-subtest modeset-vs-vblank-race

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