D20739.diff
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	Index: head/sys/netinet6/in6_mcast.c
	===================================================================
	--- head/sys/netinet6/in6_mcast.c
	+++ head/sys/netinet6/in6_mcast.c
	@@ -1267,6 +1267,7 @@
	struct epoch_tracker et;

	CTR2(KTR_MLD, "%s: dropping ref on %p", __func__, inm);
	+ IF_ADDR_WLOCK(ifp);
	NET_EPOCH_ENTER(et);
	CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
	if (ifma->ifma_protospec == inm) {
	@@ -1277,6 +1278,7 @@
	in6m_disconnect_locked(&inmh, inm);
	in6m_rele_locked(&inmh, inm);
	NET_EPOCH_EXIT(et);
	+ IF_ADDR_WUNLOCK(ifp);
	} else {
	*pinm = inm;
	}