Return-Path: Received: from mx2.netapp.com ([216.240.18.37]:19089 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751876AbZCCOQ3 (ORCPT ); Tue, 3 Mar 2009 09:16:29 -0500 Subject: Re: [PATCH 0/3] NFS regression in 2.6.26?, "task blocked for more than 120 seconds" From: Trond Myklebust To: Kasparek Tomas Cc: linux-nfs@vger.kernel.org In-Reply-To: <20090303120848.GV89843@fit.vutbr.cz> References: <20090110102458.GG47559@fit.vutbr.cz> <1231603200.29646.5.camel@heimdal.trondhjem.org> <20090112090404.GL47559@fit.vutbr.cz> <1231782009.7322.12.camel@heimdal.trondhjem.org> <1231809446.7322.17.camel@heimdal.trondhjem.org> <20090113152201.GD47559@fit.vutbr.cz> <20090116104802.GF47559@fit.vutbr.cz> <20090118130835.GH47559@fit.vutbr.cz> <20090120150301.GG47559@fit.vutbr.cz> <1232465547.7055.3.camel@heimdal.trondhjem.org> <20090303120848.GV89843@fit.vutbr.cz> Content-Type: text/plain Date: Tue, 03 Mar 2009 09:16:07 -0500 Message-Id: <1236089767.9631.4.camel@heimdal.trondhjem.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 On Tue, 2009-03-03 at 13:08 +0100, Kasparek Tomas wrote: > On Tue, Jan 20, 2009 at 10:32:27AM -0500, Trond Myklebust wrote: > > A binary wireshark dump of the traffic between one such client and the > > server would help. > > I was able to finally got the tcpdump. I got it from 2.6.27.19 client but > after several weeks without problems. I include the file and place it on > http://merlin.fit.vutbr.cz/tmp/nfs/dump_kas2_mat.dump_small (have over 1GB > of dump, but it's all the time the same SYN+RST packets). The packet rate > maxed at 260000pps from two clients. > > This dump is taken from server after reset (the server does not respond > even to keybord) before clients are disconnected/rebooted. To remind it - all > clients seems to work well with reversed > e06799f958bf7f9f8fae15f0c6f519953fb0257c Yes. I saw that behaviour when testing at Connectathon last week. When one of the servers I was testing against crashed and later came up again, the patched client went into that same SYN+RST frenzy. I'm planning to look at this now that I'm back at home. Cheers Trond -- Trond Myklebust Linux NFS client maintainer NetApp Trond.Myklebust@netapp.com www.netapp.com