[  515.643797] bond0: (slave eth0): making interface the new active one
[  515.643902] bond0: (slave eth0): Enslaving as an active interface with an up link
[  519.826534] bond0: (slave eth0): Releasing backup interface
[  519.910332] bond0: (slave eth0): Enslaving as an active interface with an up link
[  524.051244] bond0: (slave eth0): Releasing backup interface
[  524.084205] bond0 (unregistering): Released all slaves