linux-kernel - Re: recursive locking (coredump/vfs

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Message-ID: <20131124093143.GA25132@quack.suse.cz>
Date:	Sun, 24 Nov 2013 10:31:43 +0100
From:	Jan Kara <jack@...e.cz>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Jan Kara <jack@...e.cz>, Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: recursive locking (coredump/vfs_write)

On Fri 22-11-13 23:52:18, Al Viro wrote:
> On Fri, Nov 22, 2013 at 10:11:56PM +0100, Jan Kara wrote:
> >   Hi,
> > 
> > On Wed 13-11-13 16:11:47, Dave Jones wrote:
> > > here's another one..
> > > 
> > > 
> > > =============================================
> > > [ INFO: possible recursive locking detected ]
> > > 3.12.0+ #2 Not tainted
> > > ---------------------------------------------
> > > trinity-child3/13302 is trying to acquire lock:
> > >  (sb_writers#5){.+.+.+}, at: [<ffffffff811b7013>] vfs_write+0x173/0x1f0
> > > 
> > > but task is already holding lock:
> > >  (sb_writers#5){.+.+.+}, at: [<ffffffff8122006d>] do_coredump+0xf1d/0x1070
> >   Thanks for report. Attached patch should fix this. Al, can you please
> > merge it?
> 
> No.  It's already fixed in mainline by commit 52da40.
  Ah, right. After pull I can see that change. Sorry for the noise.

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