Stack trace: #0 ../lib/igt_core.c:1471 __igt_fail_assert() #1 ../lib/igt_debugfs.c:1043 igt_drop_caches_set() #2 ../lib/drmtest.c:172 gem_quiescent_gpu() #3 ../lib/drmtest.c:425 drm_open_driver() #4 ../tests/testdisplay.c:718 main() #5 ../csu/libc-start.c:344 __libc_start_main() #6 [_start+0x2a] FAIL (-1.000s)