From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Fri, 13 Jun 2008 17:53:29 +0100 (BST) Received: from smtp1.dnsmadeeasy.com ([205.234.170.144]:58762 "EHLO smtp1.dnsmadeeasy.com") by ftp.linux-mips.org with ESMTP id S20036044AbYFMQx0 (ORCPT ); Fri, 13 Jun 2008 17:53:26 +0100 Received: from smtp1.dnsmadeeasy.com (localhost [127.0.0.1]) by smtp1.dnsmadeeasy.com (Postfix) with ESMTP id 2673031E921; Fri, 13 Jun 2008 16:53:24 +0000 (UTC) X-Authenticated-Name: js.dnsmadeeasy X-Transit-System: In case of SPAM please contact abuse@dnsmadeeasy.com Received: from avtrex.com (unknown [67.116.42.147]) by smtp1.dnsmadeeasy.com (Postfix) with ESMTP; Fri, 13 Jun 2008 16:53:23 +0000 (UTC) Received: from dl2.hq2.avtrex.com ([192.168.7.26]) by avtrex.com with Microsoft SMTPSVC(6.0.3790.1830); Fri, 13 Jun 2008 09:53:04 -0700 Message-ID: <4852A5EF.5080703@avtrex.com> Date: Fri, 13 Jun 2008 09:53:03 -0700 From: David Daney User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Thomas Horsten Cc: linux-mips@linux-mips.org, Ralf Baechle Subject: Re: [BUG] R5000 failure in kmap_coherent on Lasat board, bug that has been there for a while? References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 13 Jun 2008 16:53:04.0797 (UTC) FILETIME=[F2C5B4D0:01C8CD75] Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 19543 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ddaney@avtrex.com Precedence: bulk X-list: linux-mips Thomas Horsten wrote: > Hi all, > > (resending w/ more info because the first one didn't make it to the > list - I'm subscribed now so hopefully it'll go through this time): > > This crash happens (late) during boot with 2.6.25.6. I think this is a > general R5k issue with the cache handling code. It only seems to > happen when the swap is in use like someone else observed, but usually > only after some big processes like mysql have been started. > > As far as I can see it's the same issue that has been reported several > other places, but with no resolution in any of them: > > http://www.linux-mips.org/archives/linux-mips/2007-12/msg00128.html > http://www.linux-mips.org/archives/linux-mips/2008-01/msg00132.html > and also seen by someone else here: > http://lists.debian.org/debian-mips/2007/11/msg00034.html > > I'm thinking some subtle difference between R4k and R5k caches which > isn't taken into account, or an aliasing bug that only triggers on > R5k? I have a mips 4KEc based system where I think it is happening too (sigma8634 based w/ 2.6.15 kernel). > > I also found what seems to be a related patch from OpenWRT but I have > no idea what it's supposed to solve as I could only find the raw > patch: > > https://dev.openwrt.org/browser/trunk/target/linux/brcm47xx/patches-2.6.25/160-kmap_coherent.patch?rev=11155 > > In any case I tried to apply it to my Lasat kernel, but using the > _atomic functions instead of _coherent just causes a much earlier > crash. > I will try said patch on my O2/R5000 and the sigma8634. Thanks, David Daney