From: Andy Isaacson Subject: Re: DMAR regression in 2.6.31 leads to ext4 corruption? Date: Fri, 9 Oct 2009 16:37:07 -0700 Message-ID: <20091009233707.GA24745@hexapodia.org> References: <20091009061729.GA31242@hexapodia.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii To: linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org, iommu@lists.linux-foundation.org Return-path: Content-Disposition: inline In-Reply-To: <20091009061729.GA31242@hexapodia.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Thu, Oct 08, 2009 at 11:17:29PM -0700, Andy Isaacson wrote: > I'm testing DMAR support on 2.6.32 on Intel VT-d laptop platforms. It > was pretty stable circa 2.6.31-rc5 (we have dozens of machines running > 2.6.31-rc8), but in the last two weeks I've had a bunch of instability > on Linus' tip kernels that looked potentially like IOMMU badness. > > For example, > <20090928191644.GR12922@hexapodia.org> > http://lkml.org/lkml/2009/9/28/201 > > Today while running 817b33d38 I got the following (on a Thinkpad X200 > I'd replaced the Dell with, just in case it was previously-good hardware > going bad). > > [ 29.450550] EXT4-fs error (device sda1): ext4_lookup: deleted inode referenced: 79 > [ 30.022328] DRHD: handling fault status reg 3 > [ 30.022328] DMAR:[DMA Write] Request device [00:02.0] fault addr ddae28000 > [ 30.022328] DMAR:[fault reason 05] PTE Write access is not set > [ 30.146136] DRHD: handling fault status reg 3 > [ 30.248938] DMAR:[DMA Write] Request device [00:02.0] fault addr ddae28000 > [ 30.248939] DMAR:[fault reason 05] PTE Write access is not set > > The full output of fsck and full dmesg are at the URL below. I also have a "e2image -r" for this filesystem. Please let me know if you'd like any further information. -andy