>	For IPv4, the issue is not addressed.  if you remove interface
>	address while someone is listening to IPv6 multicast group,
>	multicast group information listed in ia->ia_multiaddrs will become
>	dangling pointer (memory leak).  We need to fix it before we tackle
>	if_detach.

	2nd line should read "IPv4 multicast group", obviously :-)

itojun