Starting subtest: extended-modeset-hang-newfb-render-C
(kms_busy:15876) igt_dummyload-CRITICAL: Test assertion failure function igt_spin_batch_factory, file ../lib/igt_dummyload.c:319:
(kms_busy:15876) igt_dummyload-CRITICAL: Failed assertion: gem_bo_busy(fd, spin->handle)
Subtest extended-modeset-hang-newfb-render-C failed.
No clue. Submission failed (or at least completely instantly which is against the concept of the spin batch) and nothing out of the ordinary was reported during, before, or after.