netdev - Re: Kernel panic in inet_twdr_do_twkill

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Message-ID: <4A0BD750.4030605@free.fr>
Date:	Thu, 14 May 2009 10:33:20 +0200
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	netdev@...r.kernel.org, "Denis V. Lunev" <den@...nvz.org>
Subject: Re: Kernel panic in inet_twdr_do_twkill_work

Eric W. Biederman wrote:
> Daniel Lezcano <daniel.lezcano@...e.fr> writes:
>
>   
>> Eric W. Biederman wrote:
>>     
>>> So far I have only seen this twice.  But the backtrace looks
>>> almost identical to the one in commit d315492b1a6ba29da0fa2860759505ae1b2db857
>>>
>>> The kernels I saw this on were patched version of 2.6.28 with some
>>> network namespace backports.  commit
>>> d315492b1a6ba29da0fa2860759505ae1b2db857 was definitely present.
>>>
>>> Daniel any ideas?
>>>   
>>>       
>> Hi Eric,
>>
>> I found this one. May be it could be related to your problem:
>>
>> commit 2bad35b7c9588eb5e65c03bcae54e7eb6b1a6504
>>
>> Let me know :)
>>     
>
> "netns: oops in ip[6]_frag_reasm incrementing stats" does not look likely.
>
> There is no real ipv6 traffic currently on the our network and the panic
> is definitely in inet_twdr_do_twkill_work.
>
> Further we are getting the net of a timewait socket.  So I don't see how
> a problem with NULL devs could have anything to do with it.
>
> I really suspect the purge code is not being successful.
>   
May be you can activate the NETNS_REFCNT_DEBUG in order to check if the 
timewait socket
were destroyed at the namespace destruction ? Unfortunately it looks 
like the option is not in the Kconfig :(
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