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Re: FS corruption under ext3

On 4 Mar 2003, Stephen C. Tweedie wrote:

> Hi,
> On Mon, 2003-03-03 at 23:50, Andy Vaught wrote:
> >   We've been observing some consistent filesystem corruption under ext3.  
> > The problem is that a directory created by one of our applications
> > vanishes for some reason.  The directory is created on installation the
> > application.  The files it contains are written infrequently (days to
> > months) and read as part of every user command.  The directory is under
> > /etc and always has the same path.
> > 
> >   So far, we have had three separate customers with this problem and we
> > have observed it once ourselves.  One of our customers was able to use the
> > ext2 filesystem editor and reattach the orphaned inode, recovering his
> > data.  When we observed it here, fsck -f (ext2 and ext3) didn't find
> > anything wrong with the filesystem.  We are running Debian woody (stable)
> > with a 2.4.18 kernel.
> > 
> >   We haven't had reports of other files vanishing, just this one directory
> > and only under ext3.
> This sounds really odd.  I can't imagine any form of filesystem
> corruption which could result in a directory full of data vanishing but
> e2fsck still being happy.  Only an explicit user-land unlink ought to be
> able to do that.  I've only seen this sort of thing reported once or
> twice in the past, but it has always ended up being traced to something
> happening in user space.
> Can you reproduce this with a current 2.4.21-pre kernel from Marcelo, by
> the way?

  I can't reproduce it on demand, it is just something that seems to
happen.  Could ext3 be cleaning things up automatically?  I would suspect
that people don't really read the boot messages very carefully. I'll let
you know if it happens again.


Andy Vaught
TOLIS Engineering
andy tolisgroup com

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