panic: assertwaitok: non-zero mutex count: 1
Starting stack trace...
panic(ffffffff82ff28db) 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(ffff800034139de0) at ast+0x13f mi_ast sys/sys/syscall_mi.h:260 [inline]
ast(ffff800034139de0) at ast+0x13f sys/arch/amd64/amd64/trap.c:541
Xsyscall() at Xsyscall+0x156
end of kernel
end trace frame: 0x785f168f4bd0, count: 251
End of stack trace.