netdev - Re: BUG ? ipip unregister_netdevice

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Message-ID: <4CAF5947.3090803@free.fr>
Date:	Fri, 08 Oct 2010 19:47:51 +0200
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	unlisted-recipients:; (no To-header on input)
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Hans Schillstrom <hans.schillstrom@...csson.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BUG ? ipip unregister_netdevice_many()

On 10/08/2010 07:29 PM, Daniel Lezcano wrote:
> On 10/08/2010 06:58 PM, Eric W. Biederman wrote:
>> Daniel Lezcano<daniel.lezcano@...e.fr> writes:
>>
>>> On 10/08/2010 05:53 PM, Daniel Lezcano wrote:
>>>> On 10/08/2010 02:28 PM, Hans Schillstrom wrote:
>>>>> Hi Eric,
>>>>> Any advice how to trace this down ?
>>>>> This rollback_registered_many() seems to have on the lists before...
>>>>> All IPv4 and IPv6 tunnels causes this crash, all you have to do is
>>>>> load the tunnel module(s)
>>>>> enter a new ns and exit from it.
>>>>>
>>>>> Have not tested any more devices than tunnels,
>>>>> I did an "ip link delete" on my macvlans before exiting the ns.
>>>> Ah ! I succeed to reproduce it.
>>>> It does not appear immediately in fact.
>>>>
>>>> I am trying to simplify the configuration but I am falling in the bug I
>>>> talked about in the previous email.
>>> Ok, so after investigating, we just need a macvlan and specify an
>>> ipv6 address
>>> for it (inside a new netns of course), and the loopback is not
>>> released. I
>>> compiled out the tunnels, so they are not related to this problem I
>>> think.
>>>
>>> That reduces the scope of investigation :)
>> This reproduces the unable to free nedevice problem? Or the bad
>> pointer in macvlan_close problem?
>
> The free netdevice problem.
>
> For the macvlan problem, you have to create 2 macvlans on the *same*

Just to clarify. The problem happens with a different macvlans on 
different physical interfaces but it is harder to reproduce.






















































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