Re: unregister_netdevice: waiting for tun6to4 to become free.

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

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