Re: [PATCH] User namespaces: Only put the userns when we unhash the uid

[KOSAKI Motohiro]

> From: Serge E. Hallyn <serue@xxxxxxxxxx>
>
> 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@xxxxxxxxxxxxxx>
> Signed-off-by: Serge E. Hallyn <serue@xxxxxxxxxx>
> Acked-by: David Howells <dhowells@xxxxxxxxxx>
> Tested-by: Ingo Molnar <mingo@xxxxxxx>

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