From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta12.messagelabs.com (mail6.bemta12.messagelabs.com [216.82.250.247]) by kanga.kvack.org (Postfix) with ESMTP id 7895E6B0024 for ; Wed, 1 Jun 2011 02:56:59 -0400 (EDT) Message-ID: <4DE5E29E.7080009@redhat.com> Date: Wed, 01 Jun 2011 09:56:30 +0300 From: Avi Kivity MIME-Version: 1.0 Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39 References: <4DE44333.9000903@fnarfbargle.com> <20110531054729.GA16852@liondog.tnic> <4DE4B432.1090203@fnarfbargle.com> <20110531103808.GA6915@eferding.osrc.amd.com> <4DE4FA2B.2050504@fnarfbargle.com> <4DE589C5.8030600@fnarfbargle.com> <20110601011527.GN19505@random.random> <4DE5DCA8.7070704@fnarfbargle.com> In-Reply-To: <4DE5DCA8.7070704@fnarfbargle.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Brad Campbell Cc: Hugh Dickins , Andrea Arcangeli , Borislav Petkov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-mm On 06/01/2011 09:31 AM, Brad Campbell wrote: > On 01/06/11 12:52, Hugh Dickins wrote: > >> >> I guess Brad could try SLUB debugging, boot with slub_debug=P >> for poisoning perhaps; though it might upset alignments and >> drive the problem underground. Or see if the same happens >> with SLAB instead of SLUB. > > Not much use I'm afraid. > This is all I get in the log > > [ 3161.300073] > ============================================================================= > [ 3161.300147] BUG kmalloc-512: Freechain corrupt > > The qemu process is then frozen, unkillable but reported in state "R" > > 13881 ? R 3:27 /usr/bin/qemu -S -M pc-0.13 -enable-kvm -m > 1024 -smp 2,sockets=2,cores=1,threads=1 -nam > > The machine then progressively dies until it's frozen solid with no > further error messages. > > I stupidly forgot to do an alt-sysrq-t prior to doing an alt-sysrq-b, > but at least it responded to that. > > On the bright side I can reproduce it at will. Please try slub_debug=FZPU; that should point the finger (hopefully at somebody else). -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- 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