netdev - Re: [PATCH 01/19] netfilter: move nf_conntrack initialize out of pernet operations

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Date:	Fri, 28 Dec 2012 15:16:07 +0800
From:	Gao feng <gaofeng@...fujitsu.com>
To:	canqun zhang <canqunzhang@...il.com>
CC:	netfilter-devel@...r.kernel.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Patrick McHardy <kaber@...sh.net>, pablo@...filter.org,
	ebiederm@...ssion.com
Subject: Re: [PATCH 01/19] netfilter: move nf_conntrack initialize out of
 pernet operations

On 12/28/12 11:52, canqun zhang wrote:
> Hi all
> As discussed above,if the host machine create several linux
> containers, there will be several  net namespaces.Resources with "nf
> conntrack" are registered or unregistered on the first net
> namespace(init_net),But init_net is not unregistered lastly,so
> cleanuping other net namespaces  will triger painic.
> If net namespaces are created  with the order of 1,2,...n,they should
> be cleaned with the order of n,...2,1,so in this case init_net will be
> unregistered lastly.
> I fixed it up (see below). I have taken a lot of test!
> 

I thinks this BUG is a netfilter BUG,not a netns BUG.
Other subsystems implemented netns support don't use init_net to
do some special works((un)register/(un)set).

In fact,we can't use init_net to do this job well.such as function
nf_conntrack_clean,we shoud set ip_ct_attach to NULL before any
netns doing cleanup jobs, and set nf_ct_destroy to NULL after all of
netns finish these cleanup jobs.

So I think finally we still need this patchset,And this is a regular
way to fix this problem.

Can you help me to test if the panic bug is fixed by this patchset?
and then give me your tested-by?

thank you very much!
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