[Bug 97557] [IVB] [IGT] gem_sync/forked-default & gem_sync/forked-render causes test assertion failure

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97557

--- Comment #6 from Luis Botello <luis.botello.ortega at intel.com> ---
I tested over another IVB and the test failed 4 of 20 times with the same
assertion failure.

Adding dmesg:
==================================================
[ 9137.965587] gem_sync: executing
[ 9137.965698] [drm:i915_gem_open]
[ 9137.966244] [drm:i915_gem_open]
[ 9137.966423] gem_sync: starting subtest forked-default
[ 9147.971833] gem_sync: exiting, ret=0
[ 9149.972035] gem_sync: executing
[ 9149.972154] [drm:i915_gem_open]
[ 9149.972697] [drm:i915_gem_open]
[ 9149.972949] gem_sync: starting subtest forked-default
[ 9159.981402] gem_sync: exiting, ret=0
[ 9162.323082] gem_sync: executing
[ 9162.323192] [drm:i915_gem_open]
[ 9162.323744] [drm:i915_gem_open]
[ 9162.323985] gem_sync: starting subtest forked-default
[ 9172.333606] gem_sync: exiting, ret=99

IGT output:
================================================
IGT-Version: 1.15-g572a770 (x86_64) (Linux:
4.8.0-rc4-drm-intel-nightly-ww36-commit-f4f46e5+ x86_64)
(gem_sync:9227) igt-core-DEBUG: Test requirement passed:
!igt_run_in_simulation()
(gem_sync:9227) drmtest-DEBUG: Test requirement passed: !(fd<0)
Using Legacy submission , with semaphores
(gem_sync:9227) igt-core-DEBUG: Starting subtest: forked-default
(gem_sync:9227) ioctl-wrappers-DEBUG: Test requirement passed: gem_has_ring(fd,
ring)
Completed 424960 cycles: 23.542 us
Completed 872448 cycles: 11.464 us
Completed 1026048 cycles: 9.753 us
Completed 756736 cycles: 13.224 us
(gem_sync:9227) CRITICAL: Test assertion failure function sync_ring, file
gem_sync.c:153:
(gem_sync:9227) CRITICAL: Failed assertion:
intel_detect_and_clear_missed_interrupts(fd) == 0
(gem_sync:9227) CRITICAL: error: 1 != 0
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [sync_ring+0x306]
  #2 [__real_main722+0x5b6]
  #3 [main+0x23]
  #4 [__libc_start_main+0xf0]
  #5 [_start+0x29]
  #6 [<unknown>+0x29]
Subtest forked-default failed.
**** DEBUG ****
(gem_sync:9227) ioctl-wrappers-DEBUG: Test requirement passed: gem_has_ring(fd,
ring)
(gem_sync:9227) CRITICAL: Test assertion failure function sync_ring, file
gem_sync.c:153:
(gem_sync:9227) CRITICAL: Failed assertion:
intel_detect_and_clear_missed_interrupts(fd) == 0
(gem_sync:9227) CRITICAL: error: 1 != 0
****  END  ****
Subtest forked-default: FAIL (10.010s)
(gem_sync:9227) igt-core-DEBUG: Exiting with status code 99

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