netdev - Re: BUG ? ipip unregister_netdevice

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Message-ID: <4CAF4408.6070001@free.fr>
Date:	Fri, 08 Oct 2010 18:17:12 +0200
From:	Daniel Lezcano <daniel.lezcano@...e.fr>
To:	unlisted-recipients:; (no To-header on input)
CC:	Hans Schillstrom <hans.schillstrom@...csson.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BUG ? ipip unregister_netdevice_many()

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 :)

Looking forward ...

   -- Daniel
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