[Bug 68641] New: [HSW nv]igt/kms_flip/flip-vs-modeset-vs-hang-interruptible causes [drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring with debug kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68641

          Priority: medium
            Bug ID: 68641
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [HSW
                    nv]igt/kms_flip/flip-vs-modeset-vs-hang-interruptible
                    causes [drm:i915_hangcheck_elapsed] *ERROR* stuck on
                    render ring with debug kernel
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 84774
  --> https://bugs.freedesktop.org/attachment.cgi?id=84774&action=edit
dmesg

System Environment:
--------------------------
Platform:  Haswell
Kernel:    (drm-intel-nightly_debug)aaf0996cd776c5131d108f08a2e587ab0baaa6d4

Bug detailed description:
-----------------------------
It happens on haswell with NVIDIA card GT440. 
[drm:i915_hangcheck_elapsed] *ERROR* stuck on render ring appears in dmesg.

# cat /sys/class/drm/card1/error
no error state collected

Following cases also has this issue.
igt/kms_flip/flip-vs-modeset-vs-hang-interruptible
igt/kms_flip/flip-vs-panning-vs-hang
igt/kms_flip/flip-vs-panning-vs-hang-interruptible

output:
Using monotonic timestamps
Beginning flip-vs-modeset-vs-hang-interruptible on crtc 3, connector 21
  1920x1200 60 1920 1968 2000 2080 1200 1203 1209 1235 0x9 0x48 154000
...
flip-vs-modeset-vs-hang-interruptible on crtc 3, connector 21: PASSED

Beginning flip-vs-modeset-vs-hang-interruptible on crtc 5, connector 21
  1920x1200 60 1920 1968 2000 2080 1200 1203 1209 1235 0x9 0x48 154000
...
flip-vs-modeset-vs-hang-interruptible on crtc 5, connector 21: PASSED

Beginning flip-vs-modeset-vs-hang-interruptible on crtc 7, connector 21
  1920x1200 60 1920 1968 2000 2080 1200 1203 1209 1235 0x9 0x48 154000
...
flip-vs-modeset-vs-hang-interruptible on crtc 7, connector 21: PASSED

Subtest flip-vs-modeset-vs-hang-interruptible: SUCCESS

Reproduce steps:
----------------------------
1. ./kms_flip --run-subtest flip-vs-modeset-vs-hang-interruptible

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