[  503.914656] bond0: (slave eth0): making interface the new active one
[  503.914747] bond0: (slave eth0): Enslaving as an active interface with an up link
[  508.115371] bond0: (slave eth0): Releasing backup interface
[  508.180822] bond0: (slave eth0): Enslaving as an active interface with an up link
[  512.345445] bond0: (slave eth0): Releasing backup interface
[  512.372407] bond0 (unregistering): Released all slaves