netdev - Re: nf_unregister_net_hook: hook not found!

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Message-ID: <CAPWQB7HiD5q3QL7igYvkdRJ-O5BtS8Yt1OEkeJAJdvDY=nVsgg@mail.gmail.com>
Date:	Tue, 19 Jan 2016 13:58:00 -0800
From:	Joe Stringer <joe@....org>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	ebiederm@...ssion.com, Pablo Neira Ayuso <pablo@...filter.org>,
	netdev <netdev@...r.kernel.org>, netfilter@...r.kernel.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: nf_unregister_net_hook: hook not found!

On 30 December 2015 at 10:15, Sander Eikelenboom <linux@...elenboom.it> wrote:
> On 2015-12-30 03:39, ebiederm@...ssion.com wrote:
>>
>> Pablo Neira Ayuso <pablo@...filter.org> writes:
>>
>>> On Mon, Dec 28, 2015 at 09:05:03PM +0100, Sander Eikelenboom wrote:
>>>>
>>>> Hi,
>>>>
>>>> Running a 4.4.0-rc6 kernel i encountered the warning below.
>>>
>>>
>>> Cc'ing Eric Biederman.
>>>
>>> @Sander, could you provide a way to reproduce this?
>>
>>
>> I am on vacation until the new year, but if this is reproducible we
>> should be able to print out reg, reg->pf, reg->hooknum, reg->hook
>> to figure out which hook is having something very weird happen to it.
>>
>> This is happening in some network namespace exit.
>>
>> Eric
>>
>
> Unfortunately i have found no way to reproduce,
> 13 seconds implies it was at boot, but i only have seen this once.

How about this script?

#!/bin/sh

ip netns add at_ns0
ip netns del at_ns0
modprobe nf_conntrack_ipv4
modprobe -r nf_conntrack_ipv4