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Message-Id: <1245283327.31588.74.camel@johannes.local>
Date: Thu, 18 Jun 2009 02:02:06 +0200
From: Johannes Berg <johannes@...solutions.net>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
Cc: John Linville <linville@...driver.com>,
Netdev <netdev@...r.kernel.org>,
linux-wireless <linux-wireless@...r.kernel.org>,
"Eric W. Biederman" <ebiederm@...stanetworks.com>,
Alexey Dobriyan <adobriyan@...il.com>
Subject: Re: [PATCH] wireless extensions: play with netns
On Wed, 2009-06-17 at 16:54 -0700, Eric W. Biederman wrote:
> > Subject: net: make namespace iteration possible under RCU
> >
> > We already call rcu_barrier(), so all we need to take
> > care of is using proper RCU list add/del primitives.
>
> This of course gives you a network namespace that can be found by for_each_net rcu
> while the per net exit functions are running. I think that opens up to races
> that I don't want to think about.
Indeed. Can we move the rcu_barrier() up? Or we could insert a
synchronize_rcu() (which is sufficient for rcu_read_lock) before the
exit functions are run?
> I still haven't tracked down how I am occasionally getting time wait sockets
> with an invalid network namespace.
Ouch.
johannes
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