panic: trap type 13, code=0, pc=ffffffff81d831dc
Starting stack trace...
panic(ffffffff8282871d) at panic+0x159 sys/kern/subr_prf.c:229
kerntrap(ffffffff82ca2730) at kerntrap+0x1c7 sys/arch/amd64/amd64/trap.c:327
Xcalltrap_specstk_untramp() at Xcalltrap_specstk_untramp+0xf
end trace frame: 0x0, count: 254
End of stack trace.