From: Markus Trippelsdorf <markus@trippelsdorf.de>
Subject: Re: Filessystem corruptions while using rsnapshot
Date: Wed, 9 Sep 2009 19:20:15 +0200
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References: <20090909133026.GA1965@phenom2.trippelsdorf.de>
 <4AA7BE69.7070406@redhat.com>
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To: Eric Sandeen <sandeen@redhat.com>
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On Wed, Sep 09, 2009 at 09:40:41AM -0500, Eric Sandeen wrote:
> Markus Trippelsdorf wrote:
> > I'm using rsnapshot (http://rsnapshot.org/) to automatically backup my
> > root filesystem (btrfs) to a second harddrive running ext4. Rsnapshot
> > uses rsync and a massive amount of hard links to keep multiple backups
> > instantly available. 
> > It seems that the sheer number of hard links overwhelms ext4 and results
> > in problems that require manual fsck.ext4 runs to bring the fs back to
> > normal.
> > 
> > For example this is output from fsck.ext4:
> > 
> > Problem in HTREE directory inode <some number> 
> > ... node <increasing number> has invalid depth (2)
> > ... node <increasing number> has bad mxhash
> > ... node <increasing number> not referenced
> > 
> > This output is repeated ad nauseam while <increasing number> increases
> > at each round.
> > 
> > The bug is very simple to reproduce here. Just run rsnapshot several
> > times per day and you will eventually hit the problem.
> 
> Could you provide a bzip2'd e2image -r of a corrupted filesystem for 
> analysis?

OK I've uploaded the file (~80 MB):
http://www.2shared.com/file/7681344/d19d7154/disc_e2image.html

Hope it helps.
-- 
Markus