From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Vrabel Subject: Re: [Xen-devel] xen-netfront crash when detaching network while some network activity Date: Fri, 22 May 2015 17:58:41 +0100 Message-ID: <555F6041.7000203@citrix.com> References: <20150522114932.GC8664@mail-itl> <555F5888.4020303@citrix.com> <20150522164246.GE957@mail-itl> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Konrad Rzeszutek Wilk , Boris Ostrovsky , , xen-devel To: =?UTF-8?B?TWFyZWsgTWFyY3p5a293c2tpLUfDs3JlY2tp?= Return-path: Received: from smtp.citrix.com ([66.165.176.89]:46457 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757077AbbEVQ6o (ORCPT ); Fri, 22 May 2015 12:58:44 -0400 In-Reply-To: <20150522164246.GE957@mail-itl> Sender: netdev-owner@vger.kernel.org List-ID: On 22/05/15 17:42, Marek Marczykowski-G=C3=B3recki wrote: > On Fri, May 22, 2015 at 05:25:44PM +0100, David Vrabel wrote: >> On 22/05/15 12:49, Marek Marczykowski-G=C3=B3recki wrote: >>> Hi all, >>> >>> I'm experiencing xen-netfront crash when doing xl network-detach wh= ile >>> 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 back= end >>> is in another domU (not dom0). I'm using Xen 4.2.2. It happens on k= ernel >>> 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' >> >> I tried this about 10 times without a crash. How reproducible is it= ? >> >> I used a 4.1-rc4 frontend and a 4.0 backend. >=20 > It happens every time for me... Do you have at least two vcpus in tha= t > domU? With one vcpu it doesn't crash. The IP for ping I've used one i= n > backend domU, but it shouldn't matter. >=20 > Backend is 3.19.6 here. I don't see any changes there between rc1 and > rc4, so stayed with rc1. With 4.1-rc1 backend it also crashes for me. Doesn't repro for me with 4 VCPU PV or PVHVM guests. Is your guest kernel vanilla or does it have some qubes specific patches on top? David