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

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Message-ID: <20131122235217.GK10323@ZenIV.linux.org.uk>
Date:	Fri, 22 Nov 2013 23:52:18 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jan Kara <jack@...e.cz>
Cc:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: recursive locking (coredump/vfs_write)

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.
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