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Date: Sat, 14 Feb 2009 00:48:42 +0900
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Subject: Re: [PATCH] User namespaces: Only put the userns when we unhash the 
	uid
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: David Howells <dhowells@redhat.com>
Cc: torvalds@osdl.org, jmorris@namei.sys, akpm@linux-foundation.org,
       serue@us.ibm.com, mingo@elte.hu, linux-kernel@vger.kernel.org,
       vegard.nossum@gmail.com, containers@lists.osdl.org, snakebyte@gmx.de
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> From: Serge E. Hallyn <serue@us.ibm.com>
>
> uids in namespaces other than init don't get a sysfs entry.
>
> For those in the init namespace, while we're waiting to remove
> the sysfs entry for the uid the uid is still hashed, and
> alloc_uid() may re-grab that uid without getting a new
> reference to the user_ns, which we've already put in free_user
> before scheduling remove_user_sysfs_dir().
>
> Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
> Acked-by: David Howells <dhowells@redhat.com>
> Tested-by: Ingo Molnar <mingo@elte.hu>

ok, thanks good patch.
  Tested-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>