[   55.210520] unregister_netdevice: waiting for eth0.20 to become free. Usage count = 6
[   55.210636] unregister_netdevice: waiting for eth0.10 to become free. Usage count = 6
[   55.210686] unregister_netdevice: waiting for eth0 to become free. Usage count = 3
[   65.450583] unregister_netdevice: waiting for eth0.20 to become free. Usage count = 6
[   65.450793] unregister_netdevice: waiting for eth0.10 to become free. Usage count = 6
[   65.450855] unregister_netdevice: waiting for eth0 to become free. Usage count = 3
[   75.690577] unregister_netdevice: waiting for eth0.20 to become free. Usage count = 6
[   75.690695] unregister_netdevice: waiting for eth0.10 to become free. Usage count = 6
[   75.690741] unregister_netdevice: waiting for eth0 to become free. Usage count = 3
[   85.930600] unregister_netdevice: waiting for eth0.20 to become free. Usage count = 6
[   85.930706] unregister_netdevice: waiting for eth0.10 to become free. Usage count = 6
[   85.930748] unregister_netdevice: waiting for eth0 to become free. Usage count = 3