[  500.334165] bond0: (slave eth0): making interface the new active one
[  500.334261] bond0: (slave eth0): Enslaving as an active interface with an up link
[  504.531670] bond0: (slave eth0): Releasing backup interface
[  504.612396] bond0: (slave eth0): Enslaving as an active interface with an up link
[  508.820851] bond0: (slave eth0): Releasing backup interface
[  508.855747] bond0 (unregistering): Released all slaves