[DF4919] drv3(cpu3): hits=0 runs=0 cycles=0 cancels=0 (returned-false=0) flushes=0
[DF4919] drv0 first hit after 21130 cancel/flush ops (mode=1: cancel_work_sync)
[DF4918] loaded: sysctl hw.df4918_test=1 (needs drm.ko loaded first: kldload drm)
[DF4918] queued slow(3s)+filler; waiting 1s for the worker to enter slow_fn (lock released)...
[DF4918] drain thread started: drain_workqueue() acquires the worker lock and tsleep()s HOLDING it (linux_workqueue.c:276-281)
[DF4918] t+ 3s: drain_done=1 filler_done=1 slow_done=1 probe_done=1
[DF4918] drain completed (no deadlock) M-bM^@M^T fixed kernel?
[DF4918] done (threads park; module refuses unload)