Re: btrfs csum failed on git .pack file

Tomasz Torcz
2009-09-17T17:50:01Z

On Thu, Sep 17, 2009 at 07:10:06PM +0200, Markus Trippelsdorf wrote:
> > > 06CD DFC0: 0D 86 2B B2 57 A4 5A CD 78 4B 08 94 C0 65 17 3A
> > > 06CD DFC0: 0D 86 2B B2 57 A4 5A CD 78 0B 08 94 C0 65 17 3A
> >
> > 4B = 01001011
> > 0B = 00001011
> >
> > And so on.
> >
> > It looks like a few bits are getting flipped at the same byte offset.
> > One can imagine software bugs that would do this, certainly, but upset
> > hardware seems awfully likely too.
>
> I'm afraid you're right. I did some further tests and now I'm pretty
> sure that a bad RAM module was the root cause of it all...
> Oh well.

On the other hand, that what's so great in checksumming filesystems.
You found bad module thanks to btrfs, otherwise you wouldn't suspect
anything wrong. If you have had raid-1 for data, this corruption would
have been fixed by btrfs.

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