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Date: Tue, 14 Aug 2012 23:13:31 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Jan Kara <jack@suse.cz>
Cc: Fengguang Wu <fengguang.wu@intel.com>,
        Sasha Levin <levinsasha928@gmail.com>,
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        Dave Jones <davej@redhat.com>, Kamal Mostafa <kamal@canonical.com>,
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        Dann Frazier <dann.frazier@canonical.com>,
        Massimo Morana <massimo.morana@canonical.com>,
        linux-fsdevel@vger.kernel.org
Subject: Re: mq: INFO: possible circular locking dependency detected
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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)