Re: Btrfs duperemove corrupt data while dedup

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On Wed, 26 Aug 2015 22:33:38 +0300
Timofey Titovets <nefelim4ag@xxxxxxxxx> wrote:

> what i've got (full diff in attach):
> --- /home/nefelim4ag/dedup.after        2015-08-26 21:36:55.773452558 +0300
> +++ /home/nefelim4ag/dedup.before       2015-08-26 21:21:01.203600761 +0300
> @@ -25139,9 +25139,9 @@ caf9d41036e46b85d90a9541e8bc9ce1  /home/
> ....
> -0ccbc9c81a51f59dcf2ac0d102de37cb
> /home/nefelim4ag/L4D2/left4dead2/pak01_003.vpk
> +e665b502ee977dc1c619ecbd415c91b8
> /home/nefelim4ag/L4D2/left4dead2/pak01_000.vpk
> ....
> 
> Files sizes not changed and it's > 1MB.
> 
> Every time i've get a random data corruption.

I'd suggest that you use "vbindiff" to visually compare two files to check
what the actual corruption is, maybe this could give some hints. Is it the 1st
block, the last block, a few random bytes all over the place (unlikely), are
some parts zeroed out or contain just entirely different data, etc.

-- 
With respect,
Roman

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