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
$ 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
Steps to Reproduce:
2. log in as user
/home partition is not mounted
/home partition mounted
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
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?
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
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