LOR if_addr_lock/ifnet_rw

Hi,

I got that LOR few minutes ago:

lock order reversal:
  1st 0xfffff800094f4990 if_addr_lock (if_addr_lock) _at_ 
/usr/src/sys/netinet/igmp.c:1716
  2nd 0xffffffff818800d0 ifnet_rw (ifnet_rw) _at_ /usr/src/sys/net/if.c:243
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 
0xfffffe01dd5964b0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe01dd596560
witness_checkorder() at witness_checkorder+0xdad/frame 0xfffffe01dd5965f0
__rw_rlock() at __rw_rlock+0x9a/frame 0xfffffe01dd596690
ifnet_byindex() at ifnet_byindex+0x22/frame 0xfffffe01dd5966b0
igmp_intr() at igmp_intr+0x1f/frame 0xfffffe01dd596730
netisr_dispatch_src() at netisr_dispatch_src+0x86/frame 0xfffffe01dd5967a0
igmp_v1v2_queue_report() at igmp_v1v2_queue_report+0x186/frame 
0xfffffe01dd5967e0
igmp_fasttimo() at igmp_fasttimo+0x3ee/frame 0xfffffe01dd5968c0
pffasttimo() at pffasttimo+0x54/frame 0xfffffe01dd5968f0
softclock_call_cc() at softclock_call_cc+0x19c/frame 0xfffffe01dd5969d0
softclock() at softclock+0x47/frame 0xfffffe01dd5969f0
intr_event_execute_handlers() at intr_event_execute_handlers+0x93/frame 
0xfffffe01dd596a30
ithread_loop() at ithread_loop+0xa6/frame 0xfffffe01dd596a70
fork_exit() at fork_exit+0x84/frame 0xfffffe01dd596ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe01dd596ab0
--- trap 0, rip = 0, rsp = 0xfffffe01dd596b70, rbp = 0 ---

It caused lost of connectivity for a minute.
Other info:
FreeBSD darkstar 11.0-CURRENT FreeBSD 11.0-CURRENT #3 r274373: Tue Nov 
11 14:23:38 CET 2014 root_at_darkstar:/usr/obj/usr/src/sys/GENERIC  amd64

iwn0: RF switch: radio enabled
iwn0: iwn_read_firmware: ucode rev=0x12a80601
iwn0: iwn_read_firmware: ucode rev=0x12a80601
iwn0: iwn_read_firmware: ucode rev=0x12a80601
iwn0: <Intel(R) Centrino(R) Wireless-N 2200 BGN> mem 
0xf2c00000-0xf2c01fff irq 17 at device 0.0 on pci3
iwn0: iwn_read_firmware: ucode rev=0x12a80601

-- 
Kind Regards,
Mateusz Kwiatkowski