linux-kernel - Re: mq: INFO: possible circular locking dependency detected

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Message-ID: <20120814222915.GP7122@quack.suse.cz>
Date:	Wed, 15 Aug 2012 00:29:15 +0200
From:	Jan Kara <jack@...e.cz>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Jan Kara <jack@...e.cz>, Fengguang Wu <fengguang.wu@...el.com>,
	Sasha Levin <levinsasha928@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Kamal Mostafa <kamal@...onical.com>,
	"Peter M. Petrakis" <peter.petrakis@...onical.com>,
	Dann Frazier <dann.frazier@...onical.com>,
	Massimo Morana <massimo.morana@...onical.com>,
	linux-fsdevel@...r.kernel.org
Subject: Re: mq: INFO: possible circular locking dependency detected

On Tue 14-08-12 23:13:31, Al Viro wrote:
> On Wed, Aug 15, 2012 at 12:09:27AM +0200, Jan Kara wrote:
> >   OK, this is a theoretical deadlock since mqueue (virtual) filesystem cannot
> > really be frozen. But we should convert the mqueue code to deal with new
> > lock ordering of i_mutex and mnt_want_write() anyway to make lockdep happy
> > if anything... That file somehow escaped my conversion efforts. I'll send a
> > fix tomorrow.
> 
> It's fixed in commit 98d11eacde966041ac7357d99d4079db7173dd40 (in vfs.git)
  OK, I see. Thanks!

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