Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262631AbUKEJkr (ORCPT ); Fri, 5 Nov 2004 04:40:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262635AbUKEJkr (ORCPT ); Fri, 5 Nov 2004 04:40:47 -0500 Received: from null.rsn.bth.se ([194.47.142.3]:42403 "EHLO null.rsn.bth.se") by vger.kernel.org with ESMTP id S262631AbUKEJki (ORCPT ); Fri, 5 Nov 2004 04:40:38 -0500 Date: Fri, 5 Nov 2004 10:40:35 +0100 (CET) From: Martin Josefsson X-X-Sender: gandalf@tux.rsn.bth.se To: foo@porto.bmb.uga.edu Cc: linux-net@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: Bad UDP checksums with 2.6.9 In-Reply-To: <20041104062834.GE12763@porto.bmb.uga.edu> Message-ID: References: <20041104054838.GC12763@porto.bmb.uga.edu> <20041104062834.GE12763@porto.bmb.uga.edu> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1562 Lines: 37 On Thu, 4 Nov 2004 foo@porto.bmb.uga.edu wrote: > On Thu, Nov 04, 2004 at 12:48:38AM -0500, foo wrote: > > 'm seeing the same problem as in: > > Message-Id: 20041020191203.GA14356@merlin.emma.line.org > > or http://www.ussg.iu.edu/hypermail/linux/kernel/0410.2/1310.html > > > > I just upgraded a machine from 2.6.5 to 2.6.9, and when the amanda > > backup server contacts it, it sometimes replies with a UDP packet with a > > bad checksum. I'm using e1000 here, so it seems to not be related to > > the ethernet driver. I have a binary tcpdump if anyone's interested. > > I don't know why I didn't think of this at first, but I have another > identical machine that I upgraded at the same time that doesn't have the > problem. > > Here's a diff between their .configs - albarino is the one having > trouble. Maybe CONFIG_PACKET_MMAP? If someone can point me at a likely > config option to change I'll boot a new kernel for the next backup run > Friday night. > -CONFIG_IP_NF_AMANDA=y Disable that and it should work again, there's a bug in that conntrack helper that was introduced when some performance-fixes for non-linear packets went in. Davem has a patch for it in his tree, should find it's way into mainline soonish. Look at a netfilter-devel archive for the discussion if you are interested. /Martin - 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/