From: "David S. Miller" <davem@davemloft.net>
To: David Woodhouse <dwmw2@infradead.org>
Cc: andre@tomt.net, jgarzik@pobox.com, pp@ee.oulu.fi, netdev@oss.sgi.com
Subject: Re: unregister_netdevice: waiting for tun6to4 to become free.
Date: Wed, 22 Sep 2004 11:15:44 -0700 [thread overview]
Message-ID: <20040922111544.469dc4c2.davem@davemloft.net> (raw)
In-Reply-To: <1095854932.17821.1190.camel@hades.cambridge.redhat.com>
On Wed, 22 Sep 2004 13:08:52 +0100
David Woodhouse <dwmw2@infradead.org> wrote:
> 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.
There is code in ipv6 which takes route references to devices and moves
that reference over to loopback. There might be bugs in that area, and
I would suggest debugging in that area.
next prev parent reply other threads:[~2004-09-22 18:15 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-20 21:24 unregister_netdevice: waiting for tun6to4 to become free Pekka Pietikainen
2004-09-21 0:59 ` Jeff Garzik
2004-09-21 6:24 ` Andre Tomt
2004-09-22 12:08 ` David Woodhouse
2004-09-22 18:15 ` David S. Miller [this message]
2004-09-23 6:18 ` YOSHIFUJI Hideaki / 吉藤英明
[not found] ` <20040921121332.GR31616@rei.reeler.org>
[not found] ` <4151E680.80203@tomt.net>
[not found] ` <20040922211942.GA1674@postel.suug.ch>
[not found] ` <41523670.1090603@tomt.net>
[not found] ` <41523EC5.20805@tomt.net>
2004-09-23 7:13 ` Andre Tomt
2004-09-23 8:07 ` Andre Tomt
2004-09-23 8:22 ` YOSHIFUJI Hideaki / 吉藤英明
2004-09-24 19:05 ` [PATCH/RFC] PATCH: IPV6: Fix multiple leakages (is Re: unregister_netdevice: waiting for tun6to4 to become free.) YOSHIFUJI Hideaki / 吉藤英明
2004-09-24 20:51 ` Andre Tomt
2004-09-27 19:23 ` David S. Miller
2004-12-16 0:32 ` unregister_netdevice: waiting for tun6to4 to become free Pekka Pietikainen
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