[   12.349032] unregister_netdevice: waiting for lo to become free. Usage count = 0
[   22.589018] unregister_netdevice: waiting for lo to become free. Usage count = 0
[   32.829034] unregister_netdevice: waiting for lo to become free. Usage count = 0
[   43.069018] unregister_netdevice: waiting for lo to become free. Usage count = 0
[   53.309020] unregister_netdevice: waiting for lo to become free. Usage count = 0
[   63.549016] unregister_netdevice: waiting for lo to become free. Usage count = 0
[   73.789019] unregister_netdevice: waiting for lo to become free. Usage count = 0