lock order reversal:
1st 0xc0acfbc0 in_multi_mtx (in_multi_mtx) @ ip_output.c:295
2nd 0xc0a59fe0 pf task mtx (pf task mtx) @ pf.c:633
KDB: stack backtrace:
kdb_backtrace
wrtness_checkorder
_mtx_lock_flags
pf_test
pf_check_out
pfil_run_hooks
ip_output
igmp_sendpkt
igmp_joingroup
in_addmulti
carp_set_addr
carp_ioctl
iun_ifinit
in_control
ifioctl
soo_ioctl
ioctl
syscall
Xint0x80_syscall