From: Gordan Bobic Subject: Re: [Bug 45621] Kernel ooops: BUG: unable to handle kernel paging request at 000000080000001c Date: Mon, 06 Aug 2012 23:21:19 +0100 Message-ID: <5020435F.5000304@bobich.net> References: <20120806221442.D539011FA3A@bugzilla.kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE To: linux-ext4@vger.kernel.org Return-path: Received: from 78-86-195-58.zone2.bethere.co.uk ([78.86.195.58]:57563 "EHLO external.sentinel2" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755950Ab2HFWVW (ORCPT ); Mon, 6 Aug 2012 18:21:22 -0400 Received: from ariia.shatteredsilicon.net (unknown [10.2.3.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by external.sentinel2 (Postfix) with ESMTPSA id C8BA726D5 for ; Mon, 6 Aug 2012 23:21:19 +0100 (BST) In-Reply-To: <20120806221442.D539011FA3A@bugzilla.kernel.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: On 08/06/2012 11:14 PM, bugzilla-daemon@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=3D45621 > > > > > > --- Comment #6 from markus.doits@googlemail.com 2012-08-06 22:14:42 = --- > Just ran memtest for 3+ hours, 3 passes finished successfully. I know= , longer > is better, but cannot run it longer atm (since it's a server with cru= cial > infrastructure). System is not overclocked or so, everything default. memtest86 is completely useless at finding marginal memory. It'll only=20 typically find a problem if there is a properly, permanently dead or=20 stuck bit in the RAM. If Windows is an option temporarily for testing use OCCT. If it isn't,=20 I've found something like this to work pretty well for finding CPU and=20 memory stability issues: ##### # Assuming your /dev/shm is mounted on tmpfs - make sure it's big # enough. Adjust count=3D accordingly dd if=3D/dev/urandom bs=3D1M count=3D1024 of=3D/dev/shm/test # Run one instance of this per CPU thread #!/bin/bash sum=3D`sha512sum /tmp/test` while (/bin/true); do echo -n . sum2=3D`sha512sum /tmp/test` if [ "$sum" !=3D "$sum2" ]; then echo =E2=80=9C=E2=80=9D echo =E2=80=9CError detected. $sum !=3D $sum2=E2=80=B3 exit fi done ##### That should be a lot better at finding CPU/cache/MCH/RAM issues. Gordan -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html