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

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Message-ID: <19f34abd0805060026m138bf3dfo87dbf303362d69ca@mail.gmail.com>
Date:	Tue, 6 May 2008 09:26:30 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"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>,
	"Jan Kara" <jack@...e.cz>
Subject: Re: Problem mounting ext2 using ext3?

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.

Thanks.

Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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