From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:33101 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752060Ab2LJJ7z (ORCPT ); Mon, 10 Dec 2012 04:59:55 -0500 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Ti09b-0000KA-0t for linux-btrfs@vger.kernel.org; Mon, 10 Dec 2012 11:00:03 +0100 Received: from 77.116.246.216.wireless.dyn.drei.com ([77.116.246.216]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 10 Dec 2012 11:00:03 +0100 Received: from philipp.smutny by 77.116.246.216.wireless.dyn.drei.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 10 Dec 2012 11:00:03 +0100 To: linux-btrfs@vger.kernel.org From: Philipp Smutny Subject: Re: Weird checksum error with VM images Date: Mon, 10 Dec 2012 09:57:42 +0000 (UTC) Message-ID: References: <1350475643.26001.18.camel@fatty> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, I think I experienced exactly the same issue, with Debian Wheezy, running kernel 3.6 on an old fashioned spinning hd. I was using a 1GB raw image with a plain ext2 filesystem running qemu-kvm with the cache=none option and I got a lot of: Dec 6 21:19:59 hephaistos kernel: [ 664.769629] btrfs csum failed ino 693974 off 470827008 csum 3711077113 private 141102393 I could still copy the first ~470MB of the raw image and save the only file, that was important to me. Scrub was unable to fix it, but showed no further errors. Philipp