Jesper Juhl wrote:Using IPv4 here.
> 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.
Can you reproduce this on older kernels?I've not actively tried, but I do have several servers running various