From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brad Campbell Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39 Date: Wed, 08 Jun 2011 08:18:10 +0800 Message-ID: <4DEEBFC2.4060102@fnarfbargle.com> References: <20110601011527.GN19505@random.random> <4DE5DCA8.7070704@fnarfbargle.com> <4DE5E29E.7080009@redhat.com> <4DE60669.9050606@fnarfbargle.com> <4DE60918.3010008@redhat.com> <4DE60940.1070107@redhat.com> <4DE61A2B.7000008@fnarfbargle.com> <20110601111841.GB3956@zip.com.au> <4DE62801.9080804@fnarfbargle.com> <20110601230342.GC3956@zip.com.au> <4DE8E3ED.7080004@fnarfbargle.com> <4DE906C0.6060901@fnarfbargle.com> <4DED344D.7000005@pandora.be> <4DED9C23.2030408@fnarfbargle.com> <4DEE27DE.7060004@trash.net> <4DEE3859.6070808@fnarfbargle.com> <4DEE4538.1020404@trash.net> <1307471484.3091.43.camel@edumazet-laptop> <4DEEACC3.3030509@trash.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: quoted-printable Cc: Eric Dumazet , Bart De Schuymer , kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org To: Patrick McHardy Return-path: In-Reply-To: <4DEEACC3.3030509@trash.net> Sender: owner-linux-mm@kvack.org List-Id: netfilter-devel.vger.kernel.org On 08/06/11 06:57, Patrick McHardy wrote: > On 07.06.2011 20:31, Eric Dumazet wrote: >> Le mardi 07 juin 2011 =E0 17:35 +0200, Patrick McHardy a =E9crit : >> >>> The main suspects would be NAT and TCPMSS. Did you also try whether >>> the crash occurs with only one of these these rules? >>> >>>> I've just compiled out CONFIG_BRIDGE_NETFILTER and can no longer acc= ess >>>> the address the way I was doing it, so that's a no-go for me. >>> >>> That's really weird since you're apparently not using any bridge >>> netfilter features. It shouldn't have any effect besides changing >>> at which point ip_tables is invoked. How are your network devices >>> configured (specifically any bridges)? >> >> Something in the kernel does >> >> u16 *ptr =3D addr (given by kmalloc()) >> >> ptr[-1] =3D 0; >> >> Could be an off-one error in a memmove()/memcopy() or loop... >> >> I cant see a network issue here. > > So far me neither, but netfilter appears to trigger the bug. Would it help if I tried some older kernels? This issue only surfaced=20 for me recently as I only installed the VM's in question about 12 weeks=20 ago and have only just started really using them in anger. I could try=20 reproducing it on progressively older kernels to see if I can find one=20 that works and then bisect from there. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter= .ca/ Don't email: email@kvack.org