[  515.495852] bond0: (slave eth0): making interface the new active one
[  515.495935] bond0: (slave eth0): Enslaving as an active interface with an up link
[  519.706216] bond0: (slave eth0): Releasing backup interface
[  519.821123] bond0: (slave eth0): Enslaving as an active interface with an up link
[  523.990094] bond0: (slave eth0): Releasing backup interface
[  524.026986] bond0 (unregistering): Released all slaves