Few KMS tests - Received signal SIGQUIT. Showing all locks held in the system - kernel tainted.

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8031/shard-iclb1/igt@kms_atomic_transition@2x-modeset-transitions-nonblocking.html

Received signal SIGQUIT.
Stack trace: 
 #0 [fatal_sig_handler+0xd6]
 #1 [killpg+0x40]
 #2 [write+0xf]
 #3 [writeN+0x2d]
 #4 [igt_sysfs_vprintf+0xf4]
 #5 [igt_sysfs_printf+0x8f]
 #6 [igt_drop_caches_set+0x2a]
 #7 [drm_open_driver+0x60]
 #8 [drm_open_driver_master+0x6]
 #9 [__real_main905+0x4b4]
 #10 [main+0x27]
 #11 [__libc_start_main+0xe7]
 #12 [_start+0x2a]

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8031/shard-iclb1/igt_runner13.txt

[458.615820] [89/99] (647s left) kms_atomic_transition (2x-modeset-transitions-nonblocking)
[552.698692] Killing the test because the kernel is tainted.
[552.806644] Aborting: Kernel badly tainted (0x240) (check dmesg for details):
	(0x200) TAINT_WARN: WARN_ON has happened.