[   47.298828] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 16
[   47.298975] unregister_netdevice: waiting for lo to become free. Usage count = 4
[   47.299035] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 18
[   47.299089] unregister_netdevice: waiting for lo to become free. Usage count = 6
[   57.554802] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 16
[   57.554938] unregister_netdevice: waiting for lo to become free. Usage count = 4
[   57.554985] unregister_netdevice: waiting for ktst-veth to become free. Usage count = 18
[   57.555033] unregister_netdevice: waiting for lo to become free. Usage count = 6