>> 	the patch should do the right thing.  please test.
>This patch doesn't DTRT.  Just calling in_delmulti() for the multicast
>address records listed in ia_multiaddrs is insufficient, since they
>are reference counted and is referenced from ip_moptions.
>A reference via ip_moptions is already killed by in_pcbpurgeif().

	hmm, i see.  i now wonder why IPv6 case is working fine
	(maybe it isn't when there still are listeners).
	we may need more torture-test (can be 1.5 item).

itojun