netdev - Re: [patch 1/1][NETNS] resend: fix net released by rcu callback

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Date:	Tue, 30 Oct 2007 16:34:29 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Daniel Lezcano <dlezcano@...ibm.com>
Cc:	davem@...emloft.net, containers@...ts.osdl.org,
	netdev@...r.kernel.org
Subject: Re: [patch 1/1][NETNS] resend:  fix net released by rcu callback

Daniel Lezcano <dlezcano@...ibm.com> writes:

> Yes, I had this problem when doing ipv6 isolation for netns49. The ipv6
> subsystem creation failed and the different subsystem where rollbacked in the
> setup_net function.
> When the network namespace was about to be freed in free_net function, I had the
> error with an usage refcount different from zero.
> It appears that was coming from core/neighbour.c
>
> neigh_parms_release
>  -> neigh_rcu_free_parms
>    -> neigh_parms_put
>      -> neigh_parms_destroy
>        -> release_net
>
> The free_net function was called before rcu callback neigh_rcu_free_parms.

Ok. Cool.  It is good to know that this patch was tested.  These kinds
of subtle fixes are always more solid when you can actually test them.

Eric
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