igt@* -- GPU waiting on preempt-to-busy semaphore

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8712/shard-tglb2/igt@gem_userptr_blits@invalid-mmap-offset-unsync@wb.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_8712/shard-tglb2/igt_runner21.txt

[86.289111] [016/118] (893s left) gem_pipe_control_store_loop (reused-buffer)
Starting subtest: reused-buffer
Subtest reused-buffer: SUCCESS (2.148s)
[88.528968] [017/118] (891s left) kms_chamelium (hdmi-aspect-ratio)
Subtest hdmi-aspect-ratio: SKIP
[89.774614] [018/118] (890s left) gem_userptr_blits (invalid-mmap-offset-unsync)
Starting subtest: invalid-mmap-offset-unsync
Starting dynamic subtest: gtt
Dynamic subtest gtt: SUCCESS (0.007s)
Starting dynamic subtest: wb
[151.587768] Killing the test because the kernel is tainted.
[151.852568] Aborting: Kernel badly tainted (0x240) (check dmesg for details):
	(0x200) TAINT_WARN: WARN_ON has happened.

[151.852864] Closing watchdogs
Done.