diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 16d43f2..72af09d 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -233,6 +233,13 @@ int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
 	/* Restore final destination back after routing done */
 	ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
 
+	if (WARN_ON(skb_is_gso(skb) && skb->ip_summed != CHECKSUM_PARTIAL)) {
+		printk("%s: %d %d %d 0x%x 0x%x 0x%lx", skb->dst->dev->name,
+		       skb->ip_summed, skb_shinfo(skb)->gso_size, skb->len,
+		       skb_shinfo(skb)->gso_type, sk->sk_route_caps,
+		       skb->dst->dev->features);
+	}
+
 	return ip6_xmit(sk, skb, &fl, np->opt, 0);
 }