Re: 2.6.8-rc4-bk1 problem: unregister_netdevice: waiting for ppp0 to become free. Usage count = 1

[Jurriaan <thunder7@xs4all.nl>]

From: David S. Miller <davem@redhat.com>
Date: Sun, Aug 22, 2004 at 09:47:46PM -0700
> On Sun, 22 Aug 2004 14:39:57 +0200
> Patrick McHardy <kaber@trash.net> wrote:
> 
> > Herbert Xu wrote:
> > 
> > >Nuno Silva <nuno.silva@vgertech.com> wrote:
> > >  
> > >OK, this appears to be due to the changeset titled
> > >
> > >[PKT_SCHED]: Refcount qdisc->dev for __qdisc_destroy rcu-callback
> > >
> > >It adds a reference to dev.
> > >
> > >I don't see any code that cleans up that reference when the dev goes
> > >down.  So someone needs to add that similar to the code in net/core/dst.c.
> > >
> > >Patrick, could you please have a look at this?
> > >  
> > The reference is dropped in __qdisc_destroy. The problem lies in the CBQ
> > qdisc, it doesn't destroy the root-class and leaks the inner qdisc. These
> > two patches for 2.4 and 2.6 fix the problem.
> 
> Awesome, good detective work guys.
> 
> Patch applied, thanks.

I get the same error with 2.6.9-rc1-mm1, but now for my ipv6-over-ipv4
tunnel.

unregister_netdevice: waiting for xs6all to become free

etc. when trying to reboot or shutdown. Usage count = 1

I'm pretty sure I didn't see this in 2.6.8.1 nor in 2.6.8.1-mm1.

This is a plain ipv6-over-ipv4 tunnel like this:

/etc/network/interfaces:
auto xs6all
iface xs6all inet6 v4tunnel
        endpoint xxx.xxx.xxx.xxx
        up ip route add 2000::0/3 via xxx:xxx:xxx:xxx:xxx:xxx
        address xxx:xxx:xxx:xxx:xxx:xxx
        netmask 64
        up ip tunnel change xs6all ttl 64

I'm running Debian Unstable with all the latest updates as of today.

Thanks for any hints,
Jurriaan
-- 
"At least she's on our side," said Lindholm.
Corbie looked at him. "Investigators aren't on anybody's side."
	Simon R Green - Hellworld
Debian (Unstable) GNU/Linux 2.6.9-rc1 2x6078 bogomips load 0.46