(11:00 AM) [gfx@IVB-1-0XR1GT] [tests]$ : sudo -E ./gem_sync --r forked-each --d
IGT-Version: 1.19-g6fcc8e8 (x86_64) (Linux: 4.12.0-rc7-drm-tip-ww27-commit-df0182c+ x86_64)
(gem_sync:1373) igt-core-DEBUG: Test requirement passed: !igt_run_in_simulation()
(gem_sync:1373) drmtest-DEBUG: Test requirement passed: !(fd<0)
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) drmtest-DEBUG: Test requirement passed: is_i915_device(fd) && has_known_intel_chipset(fd)
(gem_sync:1373) ioctl-wrappers-DEBUG: Test requirement passed: err == 0
Using Legacy submission , with semaphores
(gem_sync:1373) igt-core-DEBUG: Starting subtest: forked-each
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
blt completed 656384 cycles: 228.576 us
blt completed 640000 cycles: 234.419 us
render completed 1530880 cycles: 97.996 us
bsd completed 530432 cycles: 282.902 us
render completed 1517568 cycles: 98.894 us
bsd completed 537600 cycles: 279.142 us
render completed 1525760 cycles: 98.366 us
render completed 1537024 cycles: 97.650 us
bsd completed 524288 cycles: 286.287 us
blt completed 646144 cycles: 232.304 us
blt completed 652288 cycles: 230.120 us
bsd completed 534528 cycles: 283.302 us
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) CRITICAL: Test assertion failure function sync_ring, file gem_sync.c:148:
(gem_sync:1373) CRITICAL: Failed assertion: intel_detect_and_clear_missed_interrupts(fd) == 0
(gem_sync:1373) CRITICAL: error: 4 != 0
Stack trace:
  #0 [__igt_fail_assert+0x101]
  #1 [sync_ring+0x306]
  #2 [__real_main716+0x2bb]
  #3 [main+0x33]
  #4 [__libc_start_main+0xf1]
  #5 [_start+0x29]
  #6 [<unknown>+0x29]
Subtest forked-each failed.
**** DEBUG ****
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'
(gem_sync:1373) CRITICAL: Test assertion failure function sync_ring, file gem_sync.c:148:
(gem_sync:1373) CRITICAL: Failed assertion: intel_detect_and_clear_missed_interrupts(fd) == 0
(gem_sync:1373) CRITICAL: error: 4 != 0
****  END  ****
Subtest forked-each: FAIL (151.619s)
(gem_sync:1373) igt-core-DEBUG: Exiting with status code 99
(gem_sync:1373) igt-debugfs-DEBUG: Opening debugfs directory '/sys/kernel/debug/dri/0'