From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Greear Subject: Re: Unable to halt or reboot due to - unregister_netdevice: waiting for eth0.20 to become free. Usage count = 1 Date: Thu, 31 Aug 2006 08:30:26 -0700 Message-ID: <44F70092.3030300@candelatech.com> References: <9a8748490608310817v7d722f88u167b5a84d0ff67e8@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Linux Kernel Mailing List , Mark Evans , "Fred N. van Kempen" , Ross Biro , davem@davemloft.net, yoshfuji@linux-ipv6.org, netdev@vger.kernel.org Return-path: To: Jesper Juhl In-Reply-To: <9a8748490608310817v7d722f88u167b5a84d0ff67e8@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org 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. Can you reproduce this on older kernels? Ben > > -- Ben Greear Candela Technologies Inc http://www.candelatech.com