Re: kernel BUG at fs/btrfs/extent-tree.c:5038 (linux 3.4.7)

[Olivier Bonvalet <btrfs.list@daevel.fr>]

On 02/08/2012 18:18, Olivier Bonvalet wrote:
> On 02/08/2012 15:53, David Sterba wrote:
>> On Thu, Aug 02, 2012 at 03:41:03PM +0200, Olivier Bonvalet wrote:
>>> Yes... it's a copy from my /var/log/kern.log. Is it really "disabled" ?
>>
>> I was mistaken, it really is enabled unconditionally in ctree.h:55.
>> Josef says that the V0 extent refs are not used for a long time, so the
>> question is how did they appear in your filesystem. Did you switch to a
>> new kernel from a very old one?
>>
>>
>> david
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> 
> mmm I have upgraded that system every two months, but the first setup is from april 2011 I think.
> 
> Should I start a "scrub" on all that systems installed a long time ago ?
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So after a hard reboot that filesystem is not mountable anymore :

Aug  4 00:40:06 backup2 kernel: [  614.826124] device fsid a5dfe512-c8a3-46f0-bc8c-6365b8eccdcb devid 1 transid 110423 /dev/mapper/vg--backupplug-backup
Aug  4 00:40:06 backup2 kernel: [  614.827934] btrfs: force zlib compression
Aug  4 00:40:06 backup2 kernel: [  614.827943] btrfs: not using ssd allocation scheme
Aug  4 00:40:06 backup2 kernel: [  614.827950] btrfs: enabling auto recoveryparent transid verify failed on 615015833600 wanted 110423 found 110424
Aug  4 00:40:06 backup2 kernel: [  614.933613] parent transid verify failed on 615015833600 wanted 110423 found 110424
Aug  4 00:40:06 backup2 kernel: [  614.934700] btrfs read error corrected: ino 1 off 615015833600 (dev /dev/mapper/vg--backupplug-backup sector 1209083504)
Aug  4 00:40:06 backup2 kernel: [  614.934716] Failed to read block groups: -5
Aug  4 00:40:07 backup2 kernel: [  614.952684] btrfs: open_ctree failed


Is there something I can do to fix that ? (the mount option "recovery" didn't help here)

thanks,

Olivier