linux-kernel - Re: namespaces?: bug at mm/slub.c:2750

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Message-ID: <1538.1234371764@redhat.com>
Date:	Wed, 11 Feb 2009 17:02:44 +0000
From:	David Howells <dhowells@...hat.com>
To:	"Serge E. Hallyn" <serue@...ibm.com>
Cc:	dhowells@...hat.com, Vegard Nossum <vegard.nossum@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Eric Sesterhenn <snakebyte@....de>, containers@...ts.osdl.org,
	linux-kernel@...r.kernel.org,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: namespaces?: bug at mm/slub.c:2750

Serge E. Hallyn <serue@...ibm.com> wrote:

>  static void uid_hash_remove(struct user_struct *up)
>  {
> +	put_user_ns(up->user_ns);
>  	hlist_del_init(&up->uidhash_node);
>  }

Don't you need to do the hlist_del_init() first?  Otherwise, mightn't the
put_user_ns() cause the namespace to be freed before hlist_del_init() removes
the user_struct from it?

David
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