linux-kernel - Re: Unable to halt or reboot due to - unregister_netdevice: waiting for eth0.20 to become free. Usage count = 1

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Date:	Fri, 1 Sep 2006 11:59:44 +0200
From:	"Jesper Juhl" <jesper.juhl@...il.com>
To:	"Ben Greear" <greearb@...delatech.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Fred N. van Kempen" <waltje@...lt.nl.mugnet.org>,
	"Ross Biro" <ross.biro@...il.com>, davem@...emloft.net,
	yoshfuji@...ux-ipv6.org, netdev@...r.kernel.org
Subject: Re: Unable to halt or reboot due to - unregister_netdevice: waiting for eth0.20 to become free. Usage count = 1

On 31/08/06, Jesper Juhl <jesper.juhl@...il.com> wrote:
> On 31/08/06, Ben Greear <greearb@...delatech.com> wrote:
> > Jesper Juhl wrote:
> > > Hi,
> > >
> > > I've got a small problem with 2.6.18-rc5-git2.
> > >
> > > I've got a vlan setup on eth0.20, eth0 does not have an IP.
> > >
> > > When I attempt to reboot or halt the machine I get the following
> > > message from the loop in net/core/dev.c::netdev_wait_allrefs() where
> > > it waits for the ref-count to drop to zero.
> > > Unfortunately the ref-count stays at 1 forever and the server never
> > > gets any further.
> > >
> > >  unregister_netdevice: waiting for eth0.20 to become free. Usage count = 1
> > >
> > > I googled a bit and found that people have had similar problems in the
> > > past and could work around them by shutting down the vlan interface
> > > before the 'lo' interface. I tried that and indeed, it works.
> > >
> > > Any idea how we can get this fixed?
> >
> > This is usually a ref-count leak somewhere.  Used to be IPv6 had
> > issues..then there were some neighbor leaks...but these were fixed as
> > far as I know.
> >
> Using IPv4 here.
>
>
> > Can you reproduce this on older kernels?
> >
> I've not actively tried, but I do have several servers running various
> older kernel releases with similar vlan setups and I'm not aware of
> any problems with those. Only this new box that I'm using for testing
> new kernels (currently) shows the problem, and I've only tried 2.6.8
> and 2.6.18-rc5-git2 on the box so far (2.6.8 doesn't have the
> problem).
>
I've just encountered the problem on a different server with an
identical vlan setup. That server is running 2.6.13.4

-- 
Jesper Juhl <jesper.juhl@...il.com>
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