Test patch from https://bugzilla.redhat.com/show_bug.cgi?id=857324
From: Neil Horman <nhorman@redhat.com>

--- linux-3.5.3-1.fc17.noarch/net/ipv4/tcp.c~	2012-09-28 12:29:00.141480580 -0400
+++ linux-3.5.3-1.fc17.noarch/net/ipv4/tcp.c	2012-09-28 12:29:33.975448093 -0400
@@ -1298,7 +1298,8 @@ void tcp_cleanup_rbuf(struct sock *sk, i
 
 	struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
 
-	WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq),
+	WARN(skb && !before(tp->copied_seq, TCP_SKB_CB(skb)->end_seq) &&
+	     tp->copied_seq != TCP_SKB_CB(skb)->end_seq,
 	     "cleanup rbuf bug: copied %X seq %X rcvnxt %X\n",
 	     tp->copied_seq, TCP_SKB_CB(skb)->end_seq, tp->rcv_nxt);