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Re: unregister_netdevice: waiting for tun6to4 to become free.

To: Andre Tomt <andre@xxxxxxxx>
Subject: Re: unregister_netdevice: waiting for tun6to4 to become free.
From: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Date: Wed, 22 Sep 2004 13:08:52 +0100
Cc: Jeff Garzik <jgarzik@xxxxxxxxx>, Pekka Pietikainen <pp@xxxxxxxxxx>, netdev@xxxxxxxxxxx
In-reply-to: <414FC92F.6090009@xxxxxxxx>
References: <20040920212453.GA15392@xxxxxxxxxx> <414F7CD9.3090008@xxxxxxxxx> <414FC92F.6090009@xxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On Tue, 2004-09-21 at 08:24 +0200, Andre Tomt wrote:
> Jeff Garzik wrote:
> > I hit this _once_ on my gateway (NAT'ing firewall IPv4, now also IPv6 
> > router).
> > 
> > No idea why it went away, I just assumed a more recent kernel fixed 
> > something.
> 
> We've been seeing this all the time on 2.6.8.1 + "critical fixes". 
> Pretty much anytime a router with tunneling interfaces is taken down for 
> shutdown or reboot, it hangs spinning waiting for the tunnel devices to 
> get freed, as ifdown gets run.

It's not just tunnel interfaces. It seems to be related to hot-unplug of
interfaces with live IPv6 addresses. I've seen it on my prism54 card too
on many recent kernels. All I have to do is insert it and remove it a
few times. 

-- 
dwmw2


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