D17898.id50180.diff
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D17898.id50180.diff
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	Index: sys/netinet6/in6_ifattach.c
	===================================================================
	--- sys/netinet6/in6_ifattach.c
	+++ sys/netinet6/in6_ifattach.c
	@@ -481,9 +481,16 @@
	return (-1);
	}

	- ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
	- KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp));
	-
	+ ia = in6ifa_ifpforlinklocal(ifp, 0);
	+ if (ia == NULL) {
	+ /*
	+ * Another thread removed the address that we just added.
	+ * This should be rare, but it happens.
	+ */
	+ nd6log((LOG_NOTICE, "%s: %s: new link-local address "
	+ "disappeared\n", __func__, if_name(ifp)));
	+ return (-1);
	+ }
	ifa_free(&ia->ia_ifa);

	/*