Comment # 1 on bug 108889 from Martin Peres

Also seen on SKL:
https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_149/fi-skl-6770hq/igt@sw_sync@sync_busy_fork.html

Starting subtest: sync_busy_fork
sw_sync: ../lib/igt_core.c:1592: __igt_fork_helper: Assertion `!proc->running'
failed.
Received signal SIGABRT.