linux-kernel - Re: nf_conntrack: falling back to vmalloc.

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Message-ID: <20150717150208.GO25674@breakpoint.cc>
Date:	Fri, 17 Jul 2015 17:02:08 +0200
From:	Florian Westphal <fw@...len.de>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	Florian Westphal <fw@...len.de>, netfilter-devel@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Pablo Neira Ayuso <pablo@...filter.org>, kaber@...sh.net,
	Marcelo Leitner <mleitner@...hat.com>
Subject: Re: nf_conntrack: falling back to vmalloc.

Toralf Förster <toralf.foerster@....de> wrote:
> On 07/17/2015 12:10 PM, Florian Westphal wrote:
> > Do you run containers?
> 
> No, I just run 4 Gentoo chroot images in parallel - but I do that since autumn last year.
> 
> Unfortunately I cannot see any correlation to an os/sw upgrade or a config change which could cause these messages nowadays to be appear.
> Therefore I do wonder if some network related "traffic" causes this, b/c that box acts as a Tor exit relay too.

No, I see no way how this would happen in response to network traffic.

A conntrack hash table is only allocated on network namespace creation, or when
a resize happens (someone changing /sys/module/nf_conntrack/parameters/hashsize).
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