netdev - Re: BUG ? ipip unregister_netdevice

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Message-ID: <m1k4ls1v1i.fsf@fess.ebiederm.org>
Date:	Fri, 08 Oct 2010 09:58:01 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Daniel Lezcano <daniel.lezcano@...e.fr>
Cc:	Hans Schillstrom <hans.schillstrom@...csson.com>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BUG ? ipip unregister_netdevice_many()

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?

Eric
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