[Bug 96974] New: [BAT BDW] gem_sync / basic-store-each fails sporadically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96974

            Bug ID: 96974
           Summary: [BAT BDW] gem_sync / basic-store-each fails
                    sporadically
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ville.syrjala at linux.intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Happens on ro-bdw-i7-5600u, maybe 1/3 of the time based on the CI long term
history page.

 Stdout         

IGT-Version: 1.15-g36ffa37 (x86_64) (Linux:
4.7.0-rc6-gfxbench-RO_Patchwork_1484+ x86_64)
bsd completed 31744 cycles: 316.057 us
vebox completed 15360 cycles: 654.773 us
render completed 29696 cycles: 339.167 us
blt completed 24576 cycles: 445.771 us
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [store_ring+0x57b]
  #2 [__real_main692+0x46c]
  #3 [main+0x23]
  #4 [__libc_start_main+0xf0]
  #5 [_start+0x29]
  #6 [<unknown>+0x29]
Subtest basic-store-each: FAIL (10.965s)

Stderr  

(gem_sync:5897) CRITICAL: Test assertion failure function store_ring, file
gem_sync.c:281:
(gem_sync:5897) CRITICAL: Failed assertion:
intel_detect_and_clear_missed_interrupts(fd) == 0
(gem_sync:5897) CRITICAL: error: 18 != 0
Subtest basic-store-each failed.
**** DEBUG ****
(gem_sync:5897) CRITICAL: Test assertion failure function store_ring, file
gem_sync.c:281:
(gem_sync:5897) CRITICAL: Failed assertion:
intel_detect_and_clear_missed_interrupts(fd) == 0
(gem_sync:5897) CRITICAL: error: 18 != 0
****  END  ****

Environment     

PIGLIT_SOURCE_DIR="/opt/igt/piglit" PIGLIT_PLATFORM="mixed_glx_egl"

Command         /opt/igt/tests/gem_sync --run-subtest basic-store-each
dmesg   

[   84.728418] [drm:i915_hangcheck_elapsed [i915]] *ERROR* Hangcheck timer
elapsed... video enhancement ring idle

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