Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933123Ab0GOMFf (ORCPT ); Thu, 15 Jul 2010 08:05:35 -0400 Received: from mail-wy0-f174.google.com ([74.125.82.174]:48824 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932486Ab0GOMFd (ORCPT ); Thu, 15 Jul 2010 08:05:33 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=LXiw3po7vmK7QIHWnhmPCnPm76Q3xNKX1h/jdp48AqrVCb+yAweI7hqxQJNAoREC5c OE4cwI7ZvX6hnOBq0JTJ6xcQingSZugVJ1NPLrdVAf3/6g8nyk9nwNSJAM3bTZZJNKtm KW0n8VkTNXcGhal4rOGnyvfN3Ml7yyXwPLqJk= Subject: Re: oops in tcp_xmit_retransmit_queue() w/ v2.6.32.15 From: Eric Dumazet To: Lennart Schulte Cc: Ilpo =?ISO-8859-1?Q?J=E4rvinen?= , Tejun Heo , "David S. Miller" , lkml , "netdev@vger.kernel.org" , "Fehrmann, Henning" , Carsten Aulbert In-Reply-To: <4C3EF7EA.2040900@nets.rwth-aachen.de> References: <4C358AAA.9080400@kernel.org> <4C3EF7EA.2040900@nets.rwth-aachen.de> Content-Type: text/plain; charset="UTF-8" Date: Thu, 15 Jul 2010 14:05:28 +0200 Message-ID: <1279195528.2496.2.camel@edumazet-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1064 Lines: 28 Le jeudi 15 juillet 2010 à 13:58 +0200, Lennart Schulte a écrit : > I'm testing new reordering algorithms in a virtual testbed, that is the > nodes are emulated with xen and all the network parameters can be tuned > with queues. > With one of the algorithms I also got tracebacks which include > tcp_xmit_retransmit_queue. It only happens with ACK loss. The kernel > version however is 2.6.31. > When I read this thread I tried the debug patch and got the following: > > [ 2754.413150] NULL head, pkts 0 > [ 2754.413156] Errors caught so far 1 > > Hope that is of any help. Not sure I understand. Are you saying you reproduce same tcp_xmit_retransmit_queue() bug, with a special tc qdisc/class droppping some ACK frames ? Could it be some sched problem and incorrect return codes in case of congestion ? -- 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/