From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:39180 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751353AbcDBJAL (ORCPT ); Sat, 2 Apr 2016 05:00:11 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1amHPb-0002sG-TG for linux-btrfs@vger.kernel.org; Sat, 02 Apr 2016 11:00:07 +0200 Received: from ip5f5ae008.dynamic.kabel-deutschland.de ([95.90.224.8]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 02 Apr 2016 11:00:07 +0200 Received: from hurikhan77 by ip5f5ae008.dynamic.kabel-deutschland.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 02 Apr 2016 11:00:07 +0200 To: linux-btrfs@vger.kernel.org From: Kai Krakow Subject: Re: btrfsck: backpointer mismatch (and multiple other errors) Date: Sat, 2 Apr 2016 11:00:01 +0200 Message-ID: <20160402110001.0ec354b5@jupiter.sol.kaishome.de> References: <20160331224452.0753d5c7@jupiter.sol.kaishome.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-btrfs-owner@vger.kernel.org List-ID: Am Fri, 1 Apr 2016 01:27:21 +0200 schrieb Henk Slager : > It is not clear to me what 'Gentoo patch-set r1' is and does. So just > boot a vanilla v4.5 kernel from kernel.org and see if you get csum > errors in dmesg. It is the gentoo patchset, I don't think anything there relates to btrfs: https://dev.gentoo.org/~mpagano/genpatches/trunk/4.5/ > Also, where does 'duplicate object' come from? dmesg ? then please > post its surroundings, straight from dmesg. It was in dmesg. I already posted it in the other thread and Qu took note of it. Apparently, I didn't manage to capture anything else than: btrfs_run_delayed_refs:2927: errno=-17 Object already exists It hit me unexpected. This was the first time btrfs went RO for me. It was with kernel 4.4.5 I think. I suspect this is the outcome of unnoticed corruptions that sneaked in earlier over some period of time. The system had no problems until this incident, and only then I discovered the huge pile of corruptions when I ran btrfsck. I'm also pretty convinced now that VirtualBox itself is not the problem but only victim of these corruptions, that's why it primarily shows up in the VDI file. However, I now found csum errors in unrelated files (see other post in this thread), even for files not touched in a long time. -- Regards, Kai Replies to list-only preferred.