[  515.318153] bond0: (slave eth0): making interface the new active one
[  515.318226] bond0: (slave eth0): Enslaving as an active interface with an up link
[  519.586482] bond0: (slave eth0): Releasing backup interface
[  519.721209] bond0: (slave eth0): Enslaving as an active interface with an up link
[  523.937989] bond0: (slave eth0): Releasing backup interface
[  523.959870] bond0 (unregistering): Released all slaves