linux-ext4 - Re: Kernel 3.3.8 breaks accidental ext3 mount of extended partition

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Message-ID: <20120625165721.GX21859@amd.home.annexia.org>
Date:	Mon, 25 Jun 2012 17:58:18 +0100
From:	"Richard W.M. Jones" <rjones@...hat.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Torsten Hilbrich <torsten.hilbrich@...unet.com>,
	linux-ext4@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel 3.3.8 breaks accidental ext3 mount of extended partition

On Mon, Jun 25, 2012 at 12:38:03PM -0400, Jeff Moyer wrote:
> "Richard W.M. Jones" <rjones@...hat.com> writes:
> 
> > On Mon, Jun 18, 2012 at 07:59:30AM +0200, Torsten Hilbrich wrote:
> >> Hello,
> >> 
> >> a software that tries to mount each existing partition as ext3 file system started to fail when updating from v3.3.7 to v3.3.8.
> >> 
> >> The applications then hangs-up in the mount syscall, here is a snapshot of its stack at this moment:
> >
> > We just ran into what we think is the same problem.
> >
> > Note that ext4 fails like this for any 1024 byte sized filesystem (of
> > zeroes) that you try to mount.  It's really nothing to do with
> > extended partitions.
> >
> > Here is a very simple reproducer + stack trace:
> >
> >   https://bugzilla.redhat.com/show_bug.cgi?id=835019#c4
> >
> > I will try out the patch suggested later on in this thread.
> 
> Please try the attached patch instead.  The patch I had originally
> posted for this allowed marking the first buffer beyond EOD as
> uptodate.  This isn't correct.  The patch I've attached below fixes the
> infinite loop in __getblk_slow.

Thanks Jeff.  I'm trying it now.

We also found a related bug in isofs:

  https://bugzilla.redhat.com/show_bug.cgi?id=835084

So I will check whether your patches fixes that one too.

Rich.

-- 
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