thread_invoke: preemption_level -1, possible cause: unlocking an
unlocked mutex or spinlock"

frame #4: 0xffffff800afe24a3 kernel`panic(str=<unavailable>) at debug.c:620 [opt]
frame #5: 0xffffff800affef06 kernel`thread_invoke(self=0xffffff801b7a4030, thread=0xffffff801afe4540, reason=0) at sched_prim.c:2261 [opt]
frame #6: 0xffffff800affdaff kernel`thread_block_reason(continuation=<unavailable>, parameter=<unavailable>, reason=<unavailable>) at sched_prim.c:3088 [opt]
frame #7: 0xffffff800b4fcfe1 kernel`_sleep [inlined] thread_block(continuation=<unavailable>) at sched_prim.c:3104 [opt]
frame #8: 0xffffff800b4fcfd6 kernel`_sleep(chan=<unavailable>, pri=0, wmsg=<unavailable>, abstime=1299691844730, continuation=0x0000000000000000, mtx=0x0000000000000000) at kern_synch.c:251 [opt]
frame #9: 0xffffff800b4fd352 kernel`msleep(chan=0x01000004001ddd89, mtx=0x0000000000000000, pri=0, wmsg="", ts=<unavailable>) at kern_synch.c:346 [opt]

frame #4: 0xffffff800afe24a3 kernel`panic(str=<unavailable>) at debug.c:620 [opt]
frame #5: 0xffffff800affef06 kernel`thread_invoke(self=0xffffff80176f5a50, thread=0xffffff8019a5de60, reason=0) at sched_prim.c:2261 [opt]
frame #6: 0xffffff800affdaff kernel`thread_block_reason(continuation=<unavailable>, parameter=<unavailable>, reason=<unavailable>) at sched_prim.c:3088 [opt]
frame #7: 0xffffff7f8cbf5080
frame #8: 0xffffff7f8cbf6dcf
frame #9: 0xffffff800b499c3c kernel`psynch_cvwait(p=<unavailable>, uap=<unavailable>, retval=<unavailable>) at pthread_shims.c:397 [opt]

register read