linux-kernel - Re: BUG on fs/inode.c:1442 (linux 3.3.1 and 3.3.2)

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Message-ID: <20120509104446.GB5092@quack.suse.cz>
Date:	Wed, 9 May 2012 12:44:46 +0200
From:	Jan Kara <jack@...e.cz>
To:	Lluís Batlle i Rossell <viric@...ic.name>
Cc:	Jan Kara <jack@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: BUG on fs/inode.c:1442 (linux 3.3.1 and 3.3.2)

On Sun 06-05-12 14:31:00, Lluís Batlle i Rossell wrote:
> On Wed, Apr 18, 2012 at 01:48:44PM +0200, Jan Kara wrote:
> >   Hello,
> > 
> > On Sun 15-04-12 23:56:01, Lluís Batlle i Rossell wrote:
> > > destroying my openvpn client connection (SIGINT to openvp), in linux 3.3.1 and
> > > now also in 3.3.2, I noticed this BUG in dmesg (attached).
> > > 
> > > It's a vanilla 3.3.2, at this shot.
> > > 
> > > I know it never happened to me in any 3.2, but I did not try 3.3.0.
> > > 
> > > I attach the .config. And I have the debug info for this kernel too, if this
> > > helps someone find a fix. But I imagine it's easy to reproduce.
> >   From the first look it would seem as use after free bug but can you
> > please post disassembly of iput() function from your kernel? I.e. you load
> > vmlinux in gdb and run 'disass iput'. Thanks.
> 
> Sorry for the delay. Here it is, for 3.3.2:
  Thanks for the disassembly. I was hoping that the contents of
inode->i_state would be loaded in some register so we can see what value
it has. Sadly that's not the case so I cannot say anything more.

Did the bug happen to you again after the original report?

									Honza

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