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

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Message-ID: <50EE1354.8060805@cn.fujitsu.com>
Date:	Thu, 10 Jan 2013 09:03:16 +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,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH 01/19] netfilter: move nf_conntrack initialize out of
 pernet operations

Hi canqun,

On 2012/12/28 16:48, canqun zhang wrote:
> ok, I can help you take a test, please send a big patch container this
> patchset  to my email.
> 

Can you give me your tested-by to this patchset besides patch [19/19]?
Thanks!

> 
> 2012/12/28 Gao feng <gaofeng@...fujitsu.com>:
>> 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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