netdev - Re: BUG ? ipip unregister_netdevice

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Message-ID: <m1y6a81vms.fsf@fess.ebiederm.org>
Date:	Fri, 08 Oct 2010 09:45:15 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Hans Schillstrom <hans.schillstrom@...csson.com>
Cc:	Daniel Lezcano <daniel.lezcano@...e.fr>,
	"netdev\@vger.kernel.org" <netdev@...r.kernel.org>
Subject: Re: BUG ? ipip unregister_netdevice_many()

Hans Schillstrom <hans.schillstrom@...csson.com> writes:

> Hi Eric,
> Any advice how to trace this down ?
> This rollback_registered_many() seems to have on the lists before...

That is just the core piece that does device registration.

> 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.

Ouch.  

> Have not tested any more devices than tunnels, 
> I did an "ip link delete" on my macvlans before exiting the ns.

My hunch is that we have dst entry problems, as I know those hop network
interfaces when we destroy network devices, but I have seen weird issues
with the route cache as well.

Grumble.

Eric
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