Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757045AbZFVOdU (ORCPT ); Mon, 22 Jun 2009 10:33:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756849AbZFVOcq (ORCPT ); Mon, 22 Jun 2009 10:32:46 -0400 Received: from cam-admin0.cambridge.arm.com ([193.131.176.58]:48305 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757274AbZFVOcp (ORCPT ); Mon, 22 Jun 2009 10:32:45 -0400 Subject: Re: Rootfs in eMMC: Kernel panic ...Attempted to kill init! From: Catalin Marinas To: Sudeep K N Cc: Russell King - ARM Linux , linux-arm-kernel@lists.arm.linux.org.uk, drzeus-mmc@drzeus.cx, linux-kernel@vger.kernel.org In-Reply-To: <1245680789.15580.85.camel@pc1117.cambridge.arm.com> References: <366f00c80906180218p539f9df9md30f629787fabeb2@mail.gmail.com> <20090619134446.GI24573@n2100.arm.linux.org.uk> <366f00c80906220713o7ad61a8elb6b278b7313107d8@mail.gmail.com> <1245680789.15580.85.camel@pc1117.cambridge.arm.com> Content-Type: text/plain Organization: ARM Ltd Date: Mon, 22 Jun 2009 15:32:38 +0100 Message-Id: <1245681158.15580.91.camel@pc1117.cambridge.arm.com> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 22 Jun 2009 14:32:39.0802 (UTC) FILETIME=[4B93FDA0:01C9F346] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1389 Lines: 37 On Mon, 2009-06-22 at 15:26 +0100, Catalin Marinas wrote: > On Mon, 2009-06-22 at 19:43 +0530, Sudeep K N wrote: > > Thanks for the suggestion. > > With the logs it is clear that crash is in the userspace. > > I am getting one of the 2 logs(below) randomly. > > This sounds familiar: SMP -> writealloc cache policy (could be forced by > hardware) -> cache corruption in user space with ext2. > > Does you driver use the DMA API? If not, does your eMMC driver flush the > cache (in case you hit one of the long-standing problems with PIO > drivers). > > It's worth trying this hack: > > http://article.gmane.org/gmane.linux.ports.arm.kernel/51556 To be more precise: If your system is ARM11MPCore based and your driver uses DMA, try this patch (in-software DMA cache maintenance operations broadcasting): http://www.linux-arm.org/git?p=linux-2.6-stable.git;a=commitdiff_plain;h=95298b1792121e7068258de451caec7f3dda0e78 If your driver is a PIO one, try this patch (flush_dcache_page called in the VFS layer): http://www.linux-arm.org/git?p=linux-2.6-stable.git;a=commitdiff_plain;h=d763f5815aa21095141c3ba87011906a61505dad -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/