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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
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