From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta8.messagelabs.com (mail6.bemta8.messagelabs.com [216.82.243.55]) by kanga.kvack.org (Postfix) with ESMTP id C07EF6B0011 for ; Tue, 31 May 2011 10:24:51 -0400 (EDT) Message-ID: <4DE4FA2B.2050504@fnarfbargle.com> Date: Tue, 31 May 2011 22:24:43 +0800 From: Brad Campbell 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> In-Reply-To: <20110531103808.GA6915@eferding.osrc.amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Borislav Petkov , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-mm , Hugh Dickins , Andrea Arcangeli , Izik Eidus On 31/05/11 18:38, Borislav Petkov wrote: > On Tue, May 31, 2011 at 05:26:10PM +0800, Brad Campbell wrote: >> On 31/05/11 13:47, Borislav Petkov wrote: >>> Looks like a KSM issue. Disabling CONFIG_KSM should at least stop your >>> machine from oopsing. >>> >>> Adding linux-mm. >>> >> >> I initially thought that, so the second panic was produced with KSM >> disabled from boot. >> >> echo 0> /sys/kernel/mm/ksm/run >> >> If you still think that compiling ksm out of the kernel will prevent >> it then I'm willing to give it a go. > > Ok, from looking at the code, when KSM inits, it starts the ksm kernel > thread and it looks like your oops comes from the function that is run > in the kernel thread - ksm_scan_thread. > > So even if you disable it from sysfs, it runs at least once. > Just to confirm, I recompiled 2.6.38.7 without KSM enabled and I've been unable to reproduce the bug, so it looks like you were on the money. I've moved back to 2.6.38.7 as 2.6.39 has a painful SCSI bug that panics about 75% of boots, and the reboot cycle required to get luck my way into a working kernel is just too much hassle. It would appear that XP zero's its memory space on bootup, so there would be lots of pages to merge with a couple of relatively freshly booted XP machines running. Regards, Brad. -- 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