Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750747AbVKALUV (ORCPT ); Tue, 1 Nov 2005 06:20:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750748AbVKALUU (ORCPT ); Tue, 1 Nov 2005 06:20:20 -0500 Received: from twister.ispgateway.de ([80.67.18.17]:6036 "EHLO twister.ispgateway.de") by vger.kernel.org with ESMTP id S1750747AbVKALUU (ORCPT ); Tue, 1 Nov 2005 06:20:20 -0500 Date: Tue, 1 Nov 2005 12:20:08 +0100 From: Steffen Moser To: David R Cc: linux-kernel@vger.kernel.org Subject: Re: Kernel 2.6.14 and old versions of traceroute Message-ID: <20051101112008.GR22057@steffen-moser.de> Mail-Followup-To: David R , linux-kernel@vger.kernel.org References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1472 Lines: 46 Hi David, * On Mon, Oct 31, 2005 at 07:30 PM (+0000), David R wrote: > I've noticed that old versions of traceroute no longer work properly > with the latest kernel. 2.6.13.4 is OK. I've done a bit of strace and am > posting the differences here. These are from a 64 bit kernel using > traceroute 0.6.2 as shipped with most versions of SuSE. I am experiencing exactly the same problem with traceroute-0.6.2 running on SuSE 10.0 together with kernel 2.6.14. The whole thing happens on a single core dual Opteron machine. I've tested this kernel version on that machine only, yet. I've also tried the latest traceroute version (1.0.2) from ftp://ftp.lst.de/pub/people/okir/traceroute/ and experienced the same behaviour. Olaf Kirch has just sent me a patch against 2.6.14. It has also been discussed in NETDEV. This fixed it for me: --- a/net/core/datagram.c 2005-11-01 11:38:31.000000000 +0100 +++ b/net/core/datagram.c 2005-11-01 11:38:45.000000000 +0100 @@ -213,6 +213,10 @@ { int i, err, fraglen, end = 0; struct sk_buff *next = skb_shinfo(skb)->frag_list; + + if (!len) + return 0; + next_skb: fraglen = skb_headlen(skb); i = -1; Bye, Steffen - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/