[  512.945508] bond0: (slave eth0): making interface the new active one
[  512.945578] bond0: (slave eth0): Enslaving as an active interface with an up link
[  517.145434] bond0: (slave eth0): Releasing backup interface
[  517.259324] bond0: (slave eth0): Enslaving as an active interface with an up link
[  521.427936] bond0: (slave eth0): Releasing backup interface
[  521.458964] bond0 (unregistering): Released all slaves