From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx-out-1.rwth-aachen.de ([134.130.5.186]:30481 "EHLO mx-out-1.rwth-aachen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752688AbaISJII (ORCPT ); Fri, 19 Sep 2014 05:08:08 -0400 Message-ID: <541BF025.1030309@rwth-aachen.de> Date: Fri, 19 Sep 2014 10:58:13 +0200 From: Jakob Breier MIME-Version: 1.0 To: Subject: Help for creating a useful bugreport Content-Type: text/plain; charset="utf-8"; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, my btrfs partition got corrupted. With some trouble I got most of the valuable data out of it using `btrfs restore -i` (it crashed a few times, but on the fourth or fifth run it reached the stuff I wanted to recover). As far as I can tell, the file system broke during normal operations without any hardware failures. Before I switch back to ext4, I'd like to file a bug report so my troubles were not completely in vain. Unfortunately I don't have much to work with. Can you help me with extracting enough information to create a useful bugreport? Regards, Jakob $ cat /etc/fedora-release Fedora release 20 (Heisenbug) $ uname -a Linux localhost.localdomain 3.16.2-200.fc20.x86_64 #1 SMP Mon Sep 8 11:54:45 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux $ sudo btrfs fi show /dev/dm-1 Label: 'EncJakobExtern' uuid: 8ccbd085-564d-4022-bfc9-18fd429d0a8d Total devices 1 FS bytes used 731.07GiB devid 1 size 931.60GiB used 769.04GiB path /dev/mapper/luks-a266c492-2360-404d-9ad7-00edc2f0c09d Btrfs v3.16 $ sudo mount /dev/dm-1 /mnt/diverse/ mount: wrong fs type, bad option, bad superblock on /dev/mapper/luks-a266c492-2360-404d-9ad7-00edc2f0c09d, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. $ sudo mount /dev/dm-1 /mnt/diverse/ -o recovery mount: wrong fs type, bad option, bad superblock on /dev/mapper/luks-a266c492-2360-404d-9ad7-00edc2f0c09d, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so. *Syslog:* Sep 19 10:11:11 localhost.localdomain kernel: BTRFS: device label EncJakobExtern devid 1 transid 4923 /dev/dm-1 Sep 19 10:11:11 localhost.localdomain udisksd[1971]: Unlocked LUKS device /dev/sdb1 as /dev/dm-1 Sep 19 10:16:13 localhost.localdomain sudo[5080]: jakob : TTY=pts/6 ; PWD=/home/jakob ; USER=root ; COMMAND=/bin/mount /dev/dm-1 /mnt/diverse/ Sep 19 10:16:17 localhost.localdomain kernel: BTRFS info (device dm-1): disk space caching is enabled Sep 19 10:16:18 localhost.localdomain kernel: parent transid verify failed on 46678016 wanted 4923 found 3306 Sep 19 10:16:18 localhost.localdomain kernel: parent transid verify failed on 46678016 wanted 4923 found 3306 Sep 19 10:16:18 localhost.localdomain kernel: BTRFS: Failed to read block groups: -5 Sep 19 10:16:18 localhost.localdomain kernel: BTRFS: open_ctree failed Sep 19 10:16:45 localhost.localdomain sudo[5456]: jakob : TTY=pts/6 ; PWD=/home/jakob ; USER=root ; COMMAND=/bin/mount /dev/dm-1 /mnt/diverse/ -o recovery Sep 19 10:16:45 localhost.localdomain kernel: BTRFS info (device dm-1): enabling auto recovery Sep 19 10:16:45 localhost.localdomain kernel: BTRFS info (device dm-1): disk space caching is enabled Sep 19 10:16:46 localhost.localdomain kernel: parent transid verify failed on 46678016 wanted 4923 found 3306 Sep 19 10:16:46 localhost.localdomain kernel: parent transid verify failed on 46678016 wanted 4923 found 3306 Sep 19 10:16:46 localhost.localdomain kernel: BTRFS: Failed to read block groups: -5 Sep 19 10:16:46 localhost.localdomain kernel: BTRFS: open_ctree failed *fstab entry with which it was usually mounted:* /dev/mapper/LuksOpenendEncJakobExtern /mnt/EncJakobExtern btrfs compress=lzo,nofail 0 0