[Bug 72631] New: [BDW]igt/kms_flip/flip-vs-modeset-vs-hang-interruptible causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72631

          Priority: high
            Bug ID: 72631
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BDW]igt/kms_flip/flip-vs-modeset-vs-hang-interruptibl
                    e causes system hang
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

System Environment:
--------------------------
Platform: Broadwell
kernel    (drm-intel-nightly)639e4d5e3b595cdf3088e23092afd49532addf56

Bug detailed description:
-----------------------------
It causes system on Broadwell with -nightly kernel.

output:
Using monotonic timestamps
Beginning flip-vs-modeset-vs-hang-interruptible on crtc 3, connector 15
  1920x1200 60 1920 1968 2000 2080 1200 1203 1209 1235 0x9 0x48 154000
.

(BTW, I didn't get any dmesg. We use USB network card, it doesn't support
netconsole.I will try to use serial port later.)
Steps:
---------------------------
./kms_flip --run-subtest flip-vs-modeset-vs-hang-interruptible

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