Index: sys/netinet/udp_usrreq.c
===================================================================
--- sys/netinet/udp_usrreq.c
+++ sys/netinet/udp_usrreq.c
@@ -379,7 +379,7 @@
 	so = inp->inp_socket;
 	SOCKBUF_LOCK(&so->so_rcv);
 	if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) {
-		soroverflow(so);
+		soroverflow_locked(so);
 		m_freem(n);
 		if (opts)
 			m_freem(opts);