linux-kernel - Re: debug: nt_conntrack and KVM crash

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Message-ID: <b6fcc0a1002010244j161f7f0bob46053efc0d65630@mail.gmail.com>
Date:	Mon, 1 Feb 2010 12:44:49 +0200
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Jon Masters <jonathan@...masters.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: debug: nt_conntrack and KVM crash

On Mon, Feb 1, 2010 at 12:35 PM, Jon Masters <jonathan@...masters.org> wrote:
> On Mon, 2010-02-01 at 11:36 +0200, Alexey Dobriyan wrote:
>> On Mon, Feb 1, 2010 at 11:32 AM, Jon Masters <jonathan@...masters.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.
>
> They are, but the metadata is not. Sorry for not being clear, but my
> previous mail was. i.e. there is a per-netns hashtable that is indexed
> using a global that might change at any time underneath. The htable size
> and max should be per-netns too.

So, insert printk into nf_conntrack_set_hashsize().

> An existing sysctl/module parameter affects these and should also
> ultimately either iterate through namespaces, or only affect the global
> init_net (as it almost does now, except it changes the data used by the
> others and doesn't resize them).

Those sysctls are readonly, nobody else changes hashtable size legitimately.

    Alexey, hoping sysfs code for modules is not too smart.
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