On 31/08/06, Jesper Juhl [off-list ref] wrote:

On 31/08/06, Ben Greear [off-list ref] wrote:

quoted

Jesper Juhl wrote:

quoted

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.

quoted

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 [off-list ref]
Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please      http://www.expita.com/nomime.html