From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from moo.pl ([217.149.240.132]:55469 "EHLO moo.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755894Ab0JEV3T (ORCPT ); Tue, 5 Oct 2010 17:29:19 -0400 Date: Tue, 5 Oct 2010 23:29:13 +0200 From: Leszek Urbanski To: "Michael S. Tsirkin" Cc: Anthony Liguori , qemu-devel@nongnu.org, netdev@vger.kernel.org, linux-nfs@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: Re: BUG - qdev - partial loss of network connectivity Message-ID: <20101005212913.GA27869@moo.pl> References: <20100922171832.GA28721@moo.pl> <4C9A3FAF.9090503@codemonkey.ws> <20100922182049.GA29263@moo.pl> <4C9A4C77.2080806@codemonkey.ws> <20100923140437.GA9256@moo.pl> <20100926154324.GD21843@redhat.com> <20100927213203.GA28089@moo.pl> Content-Type: text/plain; charset=iso-8859-2 In-Reply-To: <20100927213203.GA28089@moo.pl> Sender: linux-nfs-owner@vger.kernel.org List-ID: MIME-Version: 1.0 <20100927213203.GA28089@moo.pl>; from Leszek Urbanski on Mon, Sep 27, 2010 at 23:32:03 +0200 > > > > >It's vanilla 2.6.32.22, but I also reproduced this on Debian's 2.6.32-23 > > > > >(based on 2.6.32.21). > > > > > > > > > >If offload is the only difference, I'll play with different offload > > > > >options and check which one causes it. > > > > > > > > > > > > > It's not technically the only difference but it's the most likely > > > > culprit IMHO. > > > > > > udp fragmentation offload is definitely the culprit. > > > > I see. Most likely guest bug - won't be the first bug around UFO. > > If so pls copy netdev linux-nfs and virtualization. > > Do you see anything in dmesg? Can try 2.6.36-rc5? > > (for reference: first post is at: > http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01685.html ) > > I can't reproduce it on 2.6.36-rc5. Do you have an idea which patch may have This one definitely fixes it: http://patchwork.ozlabs.org/patch/55643/ (Herbert Xu: udp: Fix bogus UFO packet generation) The patch works with 2.6.32.24 too - it should probably be backported to 2.6.32.x. -- Leszek "Tygrys" Urbanski, SCSA, SCNA "Unix-to-Unix Copy Program;" said PDP-1. "You will never find a more wretched hive of bugs and flamers. We must be cautious." -- DECWARS http://cygnus.moo.pl/ -- Cygnus High Altitude Balloon From mboxrd@z Thu Jan 1 00:00:00 1970 From: Leszek Urbanski Subject: Re: BUG - qdev - partial loss of network connectivity Date: Tue, 5 Oct 2010 23:29:13 +0200 Message-ID: <20101005212913.GA27869@moo.pl> References: <20100922171832.GA28721@moo.pl> <4C9A3FAF.9090503@codemonkey.ws> <20100922182049.GA29263@moo.pl> <4C9A4C77.2080806@codemonkey.ws> <20100923140437.GA9256@moo.pl> <20100926154324.GD21843@redhat.com> <20100927213203.GA28089@moo.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Cc: Anthony Liguori , qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: "Michael S. Tsirkin" Return-path: Content-Disposition: inline In-Reply-To: <20100927213203.GA28089-4cL5GMJPxME@public.gmane.org> Sender: linux-nfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org <20100927213203.GA28089-4cL5GMJPxME@public.gmane.org>; from Leszek Urbanski on Mon, Sep 27, 2010 at 23:32:03 +0200 > > > > >It's vanilla 2.6.32.22, but I also reproduced this on Debian's 2.6.32-23 > > > > >(based on 2.6.32.21). > > > > > > > > > >If offload is the only difference, I'll play with different offload > > > > >options and check which one causes it. > > > > > > > > > > > > > It's not technically the only difference but it's the most likely > > > > culprit IMHO. > > > > > > udp fragmentation offload is definitely the culprit. > > > > I see. Most likely guest bug - won't be the first bug around UFO. > > If so pls copy netdev linux-nfs and virtualization. > > Do you see anything in dmesg? Can try 2.6.36-rc5? > > (for reference: first post is at: > http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01685.html ) > > I can't reproduce it on 2.6.36-rc5. Do you have an idea which patch may have This one definitely fixes it: http://patchwork.ozlabs.org/patch/55643/ (Herbert Xu: udp: Fix bogus UFO packet generation) The patch works with 2.6.32.24 too - it should probably be backported to 2.6.32.x. -- Leszek "Tygrys" Urbanski, SCSA, SCNA "Unix-to-Unix Copy Program;" said PDP-1. "You will never find a more wretched hive of bugs and flamers. We must be cautious." -- DECWARS http://cygnus.moo.pl/ -- Cygnus High Altitude Balloon -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=33865 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1P3F4c-0001FX-KZ for qemu-devel@nongnu.org; Tue, 05 Oct 2010 17:29:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1P3F4b-0006uM-2V for qemu-devel@nongnu.org; Tue, 05 Oct 2010 17:29:22 -0400 Received: from moo.pl ([217.149.240.132]:55467) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1P3F4a-0006uH-TF for qemu-devel@nongnu.org; Tue, 05 Oct 2010 17:29:21 -0400 Date: Tue, 5 Oct 2010 23:29:13 +0200 From: Leszek Urbanski Message-ID: <20101005212913.GA27869@moo.pl> References: <20100922171832.GA28721@moo.pl> <4C9A3FAF.9090503@codemonkey.ws> <20100922182049.GA29263@moo.pl> <4C9A4C77.2080806@codemonkey.ws> <20100923140437.GA9256@moo.pl> <20100926154324.GD21843@redhat.com> <20100927213203.GA28089@moo.pl> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline In-Reply-To: <20100927213203.GA28089@moo.pl> Subject: [Qemu-devel] Re: BUG - qdev - partial loss of network connectivity List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael S. Tsirkin" Cc: netdev@vger.kernel.org, linux-nfs@vger.kernel.org, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org <20100927213203.GA28089@moo.pl>; from Leszek Urbanski on Mon, Sep 27, 2010 at 23:32:03 +0200 > > > > >It's vanilla 2.6.32.22, but I also reproduced this on Debian's 2.6.32-23 > > > > >(based on 2.6.32.21). > > > > > > > > > >If offload is the only difference, I'll play with different offload > > > > >options and check which one causes it. > > > > > > > > > > > > > It's not technically the only difference but it's the most likely > > > > culprit IMHO. > > > > > > udp fragmentation offload is definitely the culprit. > > > > I see. Most likely guest bug - won't be the first bug around UFO. > > If so pls copy netdev linux-nfs and virtualization. > > Do you see anything in dmesg? Can try 2.6.36-rc5? > > (for reference: first post is at: > http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01685.html ) > > I can't reproduce it on 2.6.36-rc5. Do you have an idea which patch may have This one definitely fixes it: http://patchwork.ozlabs.org/patch/55643/ (Herbert Xu: udp: Fix bogus UFO packet generation) The patch works with 2.6.32.24 too - it should probably be backported to 2.6.32.x. -- Leszek "Tygrys" Urbanski, SCSA, SCNA "Unix-to-Unix Copy Program;" said PDP-1. "You will never find a more wretched hive of bugs and flamers. We must be cautious." -- DECWARS http://cygnus.moo.pl/ -- Cygnus High Altitude Balloon