panic: assertwaitok: non-zero mutex count: 2
Starting stack trace...
panic(ffffffff82ff7797) at panic+0x1ba sys/kern/subr_prf.c:229
assertwaitok() at assertwaitok+0x16f sys/kern/subr_xxx.c:163
mi_switch() at mi_switch+0x2b6 sys/kern/sched_bsd.c:412
preempt() at preempt+0x61 sys/kern/sched_bsd.c:338
ast(ffff80002a58f3d0) at ast+0x13f mi_ast sys/sys/syscall_mi.h:261 [inline]
ast(ffff80002a58f3d0) at ast+0x13f sys/arch/amd64/amd64/trap.c:541
intr_user_exit() at intr_user_exit+0x3c
end of kernel
end trace frame: 0x72f00b4e0bd0, count: 251
End of stack trace.