--- src/sys/netinet/tcp_subr.c	2004/10/15 22:59:10	1.39
+++ src/sys/netinet/tcp_subr.c	2004/11/14 00:49:08	1.40
@@ -377,6 +377,7 @@ tcp_init()
 #endif
 
 	syncache_init();
+	tcp_sack_init();
 	tcp_thread_init();
 }
 
@@ -699,6 +700,7 @@ tcp_newtcpcb(struct inpcb *inp)
 	 */
 	inp->inp_ip_ttl = ip_defttl;
 	inp->inp_ppcb = (caddr_t)tp;
+	tcp_sack_tcpcb_init(tp);
 	return (tp);		/* XXX */
 }
 
@@ -926,6 +928,9 @@ no_valid_rt:
 		FREE(q, M_TSEGQ);
 		tcp_reass_qsize--;
 	}
+	/* throw away SACK blocks in scoreboard*/
+	if (TCP_DO_SACK(tp))
+		tcp_sack_cleanup(&tp->scb);
 
 	inp->inp_ppcb = NULL;
 	soisdisconnected(so);