From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joao Martins Subject: Re: xen-netfront crash when detaching network while some network activity Date: Thu, 21 Jan 2016 12:30:48 +0000 Message-ID: <56A0CF78.1090901@oracle.com> References: <20150522114932.GC8664@mail-itl> <55645140.1050209@citrix.com> <20150526220312.GA1358@mail-itl> <20151021185734.GD31646@mail-itl> <20151117024515.GN976@mail-itl> <20151201220042.GC22107@char.us.oracle.com> <20151201223258.GH1337@mail-itl> <20160120215914.GA6384@char.us.oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: David Vrabel , Boris Ostrovsky , Annie Li , xen-devel , netdev@vger.kernel.org To: Konrad Rzeszutek Wilk , =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= Return-path: Received: from aserp1040.oracle.com ([141.146.126.69]:38716 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759214AbcAUMau (ORCPT ); Thu, 21 Jan 2016 07:30:50 -0500 In-Reply-To: <20160120215914.GA6384@char.us.oracle.com> Sender: netdev-owner@vger.kernel.org List-ID: On 01/20/2016 09:59 PM, Konrad Rzeszutek Wilk wrote: > On Tue, Dec 01, 2015 at 11:32:58PM +0100, Marek Marczykowski-G=F3reck= i wrote: >> On Tue, Dec 01, 2015 at 05:00:42PM -0500, Konrad Rzeszutek Wilk wrot= e: >>> On Tue, Nov 17, 2015 at 03:45:15AM +0100, Marek Marczykowski-G=F3re= cki wrote: >>>> On Wed, Oct 21, 2015 at 08:57:34PM +0200, Marek Marczykowski-G=F3r= ecki wrote: >>>>> On Wed, May 27, 2015 at 12:03:12AM +0200, Marek Marczykowski-G=F3= recki wrote: >>>>>> On Tue, May 26, 2015 at 11:56:00AM +0100, David Vrabel wrote: >>>>>>> On 22/05/15 12:49, Marek Marczykowski-G=F3recki wrote: >>>>>>>> Hi all, >>>>>>>> >>>>>>>> I'm experiencing xen-netfront crash when doing xl network-deta= ch while >>>>>>>> some network activity is going on at the same time. It happens= only when >>>>>>>> domU has more than one vcpu. Not sure if this matters, but the= backend >>>>>>>> is in another domU (not dom0). I'm using Xen 4.2.2. It happens= on kernel >>>>>>>> 3.9.4 and 4.1-rc1 as well. >>>>>>>> >>>>>>>> Steps to reproduce: >>>>>>>> 1. Start the domU with some network interface >>>>>>>> 2. Call there 'ping -f some-IP' >>>>>>>> 3. Call 'xl network-detach NAME 0' >>> >>> Do you see this all the time or just on occassions? >> >> Using above procedure - all the time. >> >>> I tried to reproduce it and couldn't see it. Is your VM an PV or HV= M? >> >> PV, started by libvirt. This may have something to do, the problem d= idn't >> existed on older Xen (4.1) and started by xl. I'm not sure about ker= nel >> version there, but I think I've tried there 3.18 too, which has this >> problem. >> >> But I don't see anything special in domU config file (neither backen= d >> nor frontend) - it may be some libvirt default. If that's really the >> cause. Can I (and how) get any useful information about that? >=20 > libvirt naturally does some libxl calls, and they may be different. >=20 > Any chance you could give me an idea of: > - What commands you use in libvirt? > - Do you use a bond or bridge? > - What version of libvirt you are using? >=20 > Thanks! > CC-ing Joao just in case he has seen this. >> Hm, So far I couldn't reproduce the issue with upstream Xen/linux/libvi= rt, using both libvirt or plain xl (both on a bridge setup) and also irrespective= of the both load and direction of traffic (be it a ping flood, pktgen with min= =2E sized packets or iperf). >> >> --=20 >> Best Regards, >> Marek Marczykowski-G=F3recki >> Invisible Things Lab >> A: Because it messes up the order in which people normally read text= =2E >> Q: Why is top-posting such a bad thing? >=20 >=20