linux-kernel - Re: netfilter regression causes lost pings "operation not permitted"

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Message-ID: <20161207022321.21f67a11@pog.tecnopolis.ca>
Date:   Wed, 7 Dec 2016 02:23:21 -0600
From:   Trevor Cordes <trevor@...nopolis.ca>
To:     linux-kernel@...r.kernel.org
Cc:     Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: Re: netfilter regression causes lost pings "operation not
 permitted"

On 2016-12-07 Trevor Cordes wrote:
> Bisected down to:
> 870190a9ec9075205c0fa795a09fa931694a3ff1
> 7c9664351980aaa6a4b8837a314360b3a4ad382a

Oh!  I forgot to mention the most important point: iptable_nat module
MUST be loaded for the bug to show up!

modprobe iptable_nat

If you rmmod it, the bug goes away.  Interestingly, the bug occurs even
if you have every iptables table (including -t nat) completely empty
(no rules).  All that is required is iptable_nat simply to be loaded.