Bug 728751

Summary: btrfs partition stopped mounting... unable to recover data
Product: [Fedora] Fedora Reporter: markm <marek78uk>
Component: btrfs-progsAssignee: Josef Bacik <josef>
Status: CLOSED WONTFIX QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 15CC: josef, mmahut
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2012-08-07 16:38:20 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Attachments:
Description Flags
dmesg info about kernel error none

Description markm 2011-08-07 06:01:21 UTC
Created attachment 517031 [details]
dmesg info about kernel error

Description of problem:

I woke up, opened a lid of my laptop and to my surprise nothing has happened - blank screen, only dead cursor in the top right corner. Forced reboot and my btrfs /home partition no longer boots.

Version-Release number of selected component (if applicable):

$ rpm -qa | grep btrfs
btrfs-progs-0.19-13.fc15.x86_64

$ uname -a
Linux thinkpad.mareg 2.6.40-4.fc15.x86_64 #1 SMP Fri Jul 29 18:46:53 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

How reproducible:

always

Steps to Reproduce:
1. boot
2. log in as user
  
Actual results:

/home partition is not mounted

Expected results:

/home partition mounted

Additional info:

from the boot messages:

Remounting root filesystem in read-write mode:  	[  OK  ]
mount: according to mtab, /dev/sda2 is already mounted on /

Mounting local filesystems:  /etc/init.d/functions: line 573:   970 Segmentation fault      "$@"

see dmesg.txt attached for details.

I have three partitions:

/dev/sda1 ext4  /boot
/dev/sda2 btrfs /
/dev/sda3 btrfs /home

I've tried running btrfsck, got the following result:

# btrfsck /dev/sda3 
root 5 inode 42866 errors 400
root 5 inode 47154 errors 400
root 5 inode 47155 errors 400
root 5 inode 400512 errors 400
root 5 inode 403721 errors 400
root 5 inode 403723 errors 400
root 5 inode 403724 errors 400
found 100093267968 bytes used err is 1
total csum bytes: 97371504
total tree bytes: 370462720
total fs tree bytes: 237899776
btree space waste bytes: 87330577
file data blocks allocated: 2937231593472
 referenced 96065196032
Btrfs Btrfs v0.19


but there is no way of fixing it.

I thought btrfs was ready for general use, is there any way I could recover data and migrate to ext4?

Comment 1 markm 2011-08-07 06:34:02 UTC
found a tip on the net: http://forum.sabayon.org/viewtopic.php?t=24317#p135832

apparently, booting into .38 allows me to access data without any issues - looks like a bug in kernel .39/.40

Comment 2 Fedora End Of Life 2012-08-07 16:38:22 UTC
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