===== net/ipv4/tcp_output.c 1.68 vs edited =====
--- 1.68/net/ipv4/tcp_output.c	2004-10-20 15:13:52 +10:00
+++ edited/net/ipv4/tcp_output.c	2004-10-23 11:19:21 +10:00
@@ -1038,6 +1038,7 @@
 			tp->mss_cache = tp->mss_cache_std;
 		}
 
+		BUG_TRAP(tcp_skb_pcount(skb) <= 1);
 		if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq))
 			return -ENOMEM;
 	}