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	Index: head/sys/net/if_stf.c
	===================================================================
	--- head/sys/net/if_stf.c
	+++ head/sys/net/if_stf.c
	@@ -367,6 +367,7 @@
	static int
	stf_getsrcifa6(struct ifnet ifp, struct in6_addr addr, struct in6_addr *mask)
	{
	+ struct rm_priotracker in_ifa_tracker;
	struct ifaddr *ia;
	struct in_ifaddr *ia4;
	struct in6_ifaddr *ia6;
	@@ -382,9 +383,11 @@
	continue;

	bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
	+ IN_IFADDR_RLOCK(&in_ifa_tracker);
	LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
	if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
	break;
	+ IN_IFADDR_RUNLOCK(&in_ifa_tracker);
	if (ia4 == NULL)
	continue;