linux-kernel - Re: panic on rmmod of nf_conntrack

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Message-Id: <1239742000.24204.9.camel@ice-age>
Date:	Tue, 14 Apr 2009 22:46:40 +0200
From:	Eric Leblond <eric@....fr>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Patrick McHardy <kaber@...sh.net>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: panic on rmmod of nf_conntrack_irc

Hi,

Le mardi 14 avril 2009 à 22:14 +0200, Eric Dumazet a écrit :
> Mariusz Kozlowski a écrit :
> > On Tue, 14 Apr 2009 14:16:37 +0200
> > Patrick McHardy <kaber@...sh.net> wrote:
> > 
> >> Eric Dumazet wrote:
> >>> Patrick McHardy a écrit :
> >>>> Mariusz Kozlowski wrote:
> >>>>>     netfilter: nf_conntrack: use SLAB_DESTROY_BY_RCU and get rid of
> >>>>> call_rcu()
> >>>> Thanks for the report. Does this patch fix it?
> >>>>
> >>> Hi Patrick, sorry for the delay, I was in holidays.
> >> No problem, me too :)
> >>
...

> 
> Check commit ca735b3aaa945626ba65a3e51145bfe4ecd9e222
> 
> netfilter: use a linked list of loggers

...

> Signed-off-by: Eric Leblond <eric@....fr>
> Signed-off-by: Patrick McHardy <kaber@...sh.net>
> 
> It seems "struct list_head        list[NFPROTO_NUMPROTO];" is not initialized in "struct nf_logger" ?
> 
> Please try following patch ?

I've just tested your patch. Without it, I was able to trigger the bug
(modprobe ebt_ulog ; rmmod ebt_ulog). All run cleanly with it.

All my apologies for having forgot to do this test.

BR,
-- 
Eric Leblond <eric@....fr>
INL: http://www.inl.fr/
NuFW: http://www.nufw.org/

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