linux-kernel - Re: Problem mounting ext2 using ext3?

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Message-ID: <20080506095026.GA1409@duck.suse.cz>
Date:	Tue, 6 May 2008 11:50:26 +0200
From:	Jan Kara <jack@...e.cz>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Theodore Tso <tytso@....edu>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-ext4@...r.kernel.org,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/m68k <linux-m68k@...r.kernel.org>
Subject: Re: Problem mounting ext2 using ext3?

On Tue 06-05-08 09:26:30, Vegard Nossum wrote:
> Hi,
> 
> On Tue, May 6, 2008 at 12:26 AM, Theodore Tso <tytso@....edu> wrote:
> > On Mon, May 05, 2008 at 11:11:46PM +0200, Geert Uytterhoeven wrote:
> >  > when mounting the root file system, which is ext2 (has_journal is not set).
> >  > Apparently it crashes in ext3_sync_fs because EXT3_SB(sb)->s_journal is NULL.
> >  >
> >  > At first I thought it was an issue with the byteswapped IDE bus on Atari (a
> >  > new and different solution to handle this just went into mainline), but if I
> >  > disable CONFIG_EXT3 support, it boots up fine.
> >  >
> >  > Is this a known problem?
> >
> >  I can confirm this as a regression.  You don't even need to mount it
> >  as a root filesystem, or do this on an 68k system.  On my x86 system,
> >  using a kernel based off of git commit: afa26be8 (6 commits after
> >  2.6.26-rc1), mounting an ext3 filesystem, you can cause an oops by
> >  taking an ext2 filesystem and forcing a mount as ext3, "mount -t ext3
> >  /dev/closure/textext2fs /mnt").  (see below for my oops).  This does
> >  not occur with a kernel based off of 2.6.25, so it's a definite
> >  regression.
> 
> Hi,
> 
> I posted a very similar problem a couple of days ago:
> http://www.nabble.com/BUG-in-ext3_sync_fs-td16999997.html
> 
> to which I got zero replies. Can I close this in my internal bugzilla
> as dup/"not my fault"? The stacktrace looks very similar. This was
> also ext2 fs mounted (apparently) by ext3 code.
  Yes, this looks like the same problem. I'll take care of that.

								Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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