netdev - Re: [PATCH 20/38] netns ct: NOTRACK in netns

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Date:	Sun, 24 Aug 2008 14:43:13 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	kaber@...sh.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, containers@...ts.linux-foundation.org
Subject: Re: [PATCH 20/38] netns ct: NOTRACK in netns

On Sat, Aug 23, 2008 at 08:35:07PM -0400, Jan Engelhardt wrote:
> 
> On Friday 2008-08-22 07:30, adobriyan@...il.com wrote:
> >
> >We wait for untracked ct refcount to drop to 1 back:
> >
> >	/* wait until all references to nf_conntrack_untracked are dropped */
> >	while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1)
> >		schedule();
> >
> >Consequently it should be one per netns, otherwise netns A can prevent
> >netns B from stopping.
> >
> 
> But nf_conntrack_cleanup is not per netns, is it?

That's because nf_conntrack_cleanup() is _code_.

If netns A actively uses NOTRACK, untracked ct refcount will be bumped.
And netns B which haven't used NOTRACK at all will wait for netns A to
stop using NOTRACK potentially indefinitely.

> At least I do not think it should be.

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