systemd-network-generator fails when ip=auto passed on kernel arguments:
Jan 10 14:03:40 localhost.localdomain systemd-network-generator[1502]: Failed to parse kernel command line: Invalid argument
Jan 10 14:03:40 localhost.localdomain systemd[1]: systemd-network-generator.service: Main process exited, code=exited, status=1/FAILURE

The issue looks be be cosmetic only as it doesn't affect the network configuration.

    4.15

    always

    1. Install coreos with ip=auto karg: coreos-installer install--append-karg ip=auto /dev/sda     
    

    [systemd]
Failed Units: 1
  systemd-network-generator.service

    unit systemd-network-generator does not fail

core@localhost ~]$ sudo journalctl -x -u systemd-network-generator.service | ca 
Jan 10 16:36:49 localhost.localdomain systemd-network-generator[1451]: Failed to parse kernel command line: Invalid argument
Jan 10 16:36:49 localhost.localdomain systemd[1]: systemd-network-generator.service: Main process exited, code=exited, status=1/FAILURE
░░ Subject: Unit process exited
░░ Defined-By: systemd
░░ Support: https://access.redhat.com/support
░�� 
░░ An ExecStart= process belonging to unit systemd-network-generator.service has exited.
░░ 
░░ The process' exit code is 'exited' and its exit status is 1.
Jan 10 16:36:49 localhost.localdomain systemd[1]: systemd-network-generator.service: Failed with result 'exit-code'.
░░ Subject: Unit failed
░░ Defined-By: systemd
░░ Support: https://access.redhat.com/support
░░ 
░░ The unit systemd-network-generator.service has entered the 'failed' state with result 'exit-code'.
Jan 10 16:36:49 localhost.localdomain systemd[1]: Failed to start Generate network units from Kernel command line.
░░ Subject: A start job for unit systemd-network-generator.service has failed
░░ Defined-By: systemd
░░ Support: https://access.redhat.com/support
░��� 
░░ A start job for unit systemd-network-generator.service has finished with a failure.
░░ 
░░ The job identifier is 433 and the job result is failed.