NetworkManager restart fails with: device state change: prepare -> failed (reason 'dependency-failed')

Solution Verified - Updated -

Issue

  • NetworkManager comes up on boot, but a systemctl restart NetworkManager.service fails to activate bond slaves. The following messages are logged:
NetworkManager[141659]: <info>  (ens4f1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
NetworkManager[141659]: <info>  (ens5f1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
NetworkManager[141659]: <info>  (ens7f1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
NetworkManager[141659]: <info>  (ens8f1): device state change: prepare -> failed (reason 'dependency-failed') [40 120 50]
NetworkManager[141659]: <info>  Disabling autoconnect for connection 'ens8f1'.
NetworkManager[141659]: <warn>  (ens8f1): Activation: failed for connection 'ens8f1'
NetworkManager[141659]: <info>  (ens4f1): device state change: prepare -> failed (reason 'dependency-failed') [40 120 50]
NetworkManager[141659]: <info>  Disabling autoconnect for connection 'ens4f1'.
NetworkManager[141659]: <warn>  (ens4f1): Activation: failed for connection 'ens4f1'
NetworkManager[141659]: <info>  (ens5f1): device state change: prepare -> failed (reason 'dependency-failed') [40 120 50]
NetworkManager[141659]: <info>  Disabling autoconnect for connection 'ens5f1'.
NetworkManager[141659]: <warn>  (ens5f1): Activation: failed for connection 'ens5f1'
NetworkManager[141659]: <info>  (ens7f1): device state change: prepare -> failed (reason 'dependency-failed') [40 120 50]
NetworkManager[141659]: <info>  NetworkManager state is now DISCONNECTED
NetworkManager[141659]: <info>  Disabling autoconnect for connection 'ens7f1'.
NetworkManager[141659]: <warn>  (ens7f1): Activation: failed for connection 'ens7f1

Environment

  • Red Hat Enterprise Linux 7.2 or earlier
  • NetworkManager-1.0.6 series
  • Bonding

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