[  515.261134] bond0: (slave eth0): making interface the new active one
[  515.261226] bond0: (slave eth0): Enslaving as an active interface with an up link
[  519.440800] bond0: (slave eth0): Releasing backup interface
[  519.509641] bond0: (slave eth0): Enslaving as an active interface with an up link
[  523.669182] bond0: (slave eth0): Releasing backup interface
[  523.690195] bond0 (unregistering): Released all slaves