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Subject: Re: debug: nt_conntrack and KVM crash
From: Eric Dumazet <eric.dumazet@gmail.com>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jon Masters <jonathan@jonmasters.org>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       netdev <netdev@vger.kernel.org>,
       netfilter-devel <netfilter-devel@vger.kernel.org>,
       Patrick McHardy <kaber@trash.net>
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Date: Mon, 01 Feb 2010 11:12:40 +0100
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Le lundi 01 février 2010 à 11:36 +0200, Alexey Dobriyan a écrit :
> On Mon, Feb 1, 2010 at 11:32 AM, Jon Masters <jonathan@jonmasters.org> wrote:
> > I hacked up a per-namespace version of hashtables (this needs doing
> > anyway, since the global stuff is just waiting to break)
> 
> Which ones? Conntrack hashtables are per-netns.

It seems they are, but this is not a complete work :

1) Global settings (shared by all netns)
2) nf_conntrack_cachep is shared, it should be not shared.
3) nf_conntrack_untracked shared by all netns, it should be local.

nf_conntrack_cleanup_net() can block forever because of this.

while (atomic_read(&nf_conntrack_untracked.ct_general.use) > 1)
	schedule();

...