[ 9749.923497] unregister_netdevice: waiting for xfrm0 to become free. Usage count = 8
[ 9750.890497] unregister_netdevice: waiting for link1 to become free. Usage count = 10
[ 9750.890564] unregister_netdevice: waiting for link0 to become free. Usage count = 11
[ 9751.867499] unregister_netdevice: waiting for eth0.20 to become free. Usage count = 6
[ 9751.867606] unregister_netdevice: waiting for eth0.10 to become free. Usage count = 6
[ 9751.867692] unregister_netdevice: waiting for eth0 to become free. Usage count = 3