linux-ext4 - Re: 3.9-rc6 ext4: free_rb_tree

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Message-ID: <20130624132804.GA7709@gmail.com>
Date:	Mon, 24 Jun 2013 21:28:04 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Daniel J Blueman <daniel@...ra.org>, linux-ext4@...r.kernel.org
Subject: Re: 3.9-rc6 ext4: free_rb_tree_fname oops

On Mon, Jun 24, 2013 at 08:37:26AM -0400, Theodore Ts'o wrote:
> (LKML and Linux-fsdevel moved to bcc)
> 
> On Mon, Jun 24, 2013 at 02:34:00PM +0800, Daniel J Blueman wrote:
> > On 16 April 2013 15:37, Daniel J Blueman <daniel@...ra.org> wrote:
> > > When using e4defrag on a ext4 filesystem created a month ago, I ran
> > > into this fatal page fault [1]
> > >  while running e4defrag on 3.9-rc6 (Ubuntu mainline).
> > >
> > > e2fsdump output is at http://quora.org/2012/e2fsdump.txt ; let me know
> > > if you need any more info.
> > 
> > With 3.9.6 mainline, I got the exact same protection fault at
> > free_rb_tree_fname() from ext4_htree_free_dir_info() [1]. This
> > suggests use-after-free, as there's no pagetable mapping.
> > 
> > There is nothing special with my setups, so there is fair chance it's
> > reproducible there with e4defrag on a few month old filesystem and
> > recent kernels.
> 
> Sounds like we may have a bug in how the new extent_status tree code
> was integrated into fs/ext4/move_extent.c.  Zheng, if you could take a
> look I'd really appreciate it.

Sorry for the late reply.  I will take a close look at this bug.

Regards,
                                                - Zheng
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