Re: Corrupted FS with "open_ctree failed" and "failed to recover balance: -5"

[Udo Waechter <root@zoide.net>]

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Thanks for the answer.

On 16/07/18 10:32, Qu Wenruo wrote:
> 
> 
> On 2018年07月16日 16:15, Udo Waechter wrote:
>>> The weird thing is that I can't really find information about the
>>> "failed to recover balance: -5" error. - There was no rebalancing
>>> running when during the crash.
> 
> Can only be determined by tree dump.
> 
> # btrfs ins dump-tree -t root <device>
This gives me:

btrfs-progs v4.13.3
parent transid verify failed on 321265147904 wanted 3276017 found 3273915
parent transid verify failed on 321265147904 wanted 3276017 found 3273915
parent transid verify failed on 321265147904 wanted 3276017 found 3263707
parent transid verify failed on 321265147904 wanted 3276017 found 3273915
Ignoring transid failure
leaf parent key incorrect 321265147904
ERROR: unable to open /dev/vg00/var_....

>>> * Unfortunatly I did a "btrfs rescue zero-log" at some point :( - As it
>>> turns out that might have been a bad idea
>>>
>>>
>>> * Also, a "btrfs  check --init-extent-tree" - https://pastebin.com/jATDCFZy
> 
> Then it is making things worse, fortunately it should terminate before
> it causes more damage.
> 
> I'm just curious why people doesn't try the safest "btrfs check" without
> any options, but goes the most dangerous option.
> 
> And "btrfs check" output please.
> If possible, "btrfs check --mode=lowmem" is also good for debug.
> 
Same thing here:

parent transid verify failed on 321265147904 wanted 3276017 found 3273915
parent transid verify failed on 321265147904 wanted 3276017 found 3273915
parent transid verify failed on 321265147904 wanted 3276017 found 3263707
parent transid verify failed on 321265147904 wanted 3276017 found 3273915
Ignoring transid failure
leaf parent key incorrect 321265147904
ERROR: cannot open file system


I did an image with dd pretty early in this process. Unfortunatly this
gives me the same error.


Thanks,
udo.

> Thanks,
> Qu
> 
>>>
>>> The volume contained qcow2 images for VMs. I need only one of those,
>>> since one piece of important software decided to not do backups :(
>>>
>>> Any help is highly appreciated.
>>>
>>> Many thanks,
>>> udo.
>>>
>>
> 


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