From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: [cgroup or VFS ?]  WARNING: at fs/namespace.c:636
	mntput_no_expire+0xac/0xf2()
Date: Mon, 9 Feb 2009 11:03:48 +0000
Message-ID: <20090209110348.GV28946@ZenIV.linux.org.uk>
References: <49617D35.4040805@cn.fujitsu.com> <20090209004046.3ce1dde0.akpm@linux-foundation.org> <498FEE24.5030407@cn.fujitsu.com>
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Cc: Andrew Morton <akpm@linux-foundation.org>, LKML <linux-kernel@vger.kernel.org>, Paul Menage <menage@google.com>, containers@lists.osdl.org, Arjan van de Ven <arjan@infradead.org>
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	BTW, a trivial note - kfree(root) in your ->kill_sb() is done
earlier than it's nice to do.  Shouldn't affect the problem, though.