[Bug 70747] New: igt/ZZ_missed_irq causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70747

          Priority: medium
            Bug ID: 70747
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: igt/ZZ_missed_irq causes [drm:i915_hangcheck_elapsed]
                    *ERROR* Hangcheck timer elapsed... render ring idle
        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 87966
  --> https://bugs.freedesktop.org/attachment.cgi?id=87966&action=edit
dmesg

System Environment:
--------------------------
Platform:  PNV/ILK/SNB/IVB/HSW
Kernel:    (drm-intel-nightly)d1b2b826f0969182f055d11c991f90fdc6a4924a

Bug detailed description:
---------------------------
It causes [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed...
render ring idle on PNV/ILK/SNB/IVB/HSW with -nightly and -queued kernel.
-fixes kernel doesn't support interrupt masking. It's a new case.

output:
.
Interrupts masked
Interrupts unmasked
Cleared missed interrupts

no error state collected in debug/dri/0/i915_error_state.

Reproduce steps:
----------------------------
1. ./ZZ_missed_irq

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