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

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Message-ID: <20120814221331.GK23464@ZenIV.linux.org.uk>
Date:	Tue, 14 Aug 2012 23:13:31 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Jan Kara <jack@...e.cz>
Cc:	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 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)
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