I noted some failures at boot time: digging I  found:

[root@Fujiantonio antonio] systemctl | grep failed
rngd.service                                                                                loaded failed failed    Hardware RNG Entropy Gatherer Daemon
systemd-sysctl.service                                                                      loaded failed failed    Apply Kernel Variables

[root@Fujiantonio antonio]# journalctl -a -b  _SYSTEMD_UNIT=systemd-sysctl.service --no-pager
-- Logs begin at mer 2014-03-12 22:00:56 CET, end at lun 2014-04-14 13:24:40 CEST. --

[root@Fujiantonio antonio]# systemctl -l status systemd-sysctl.service
systemd-sysctl.service - Apply Kernel Variables
   Loaded: loaded (/usr/lib/systemd/system/systemd-sysctl.service; static)
   Active: failed (Result: exit-code) since lun 2014-04-14 08:54:03 CEST; 4h 32min ago
     Docs: man:systemd-sysctl.service(8)
  Process: 512 ExecStart=/usr/lib/systemd/systemd-sysctl (code=exited, status=1/FAILURE)
 Main PID: 512 (code=exited, status=1/FAILURE)

apr 14 08:54:03 Fujiantonio systemd[1]: Starting Apply Kernel Variables...
apr 14 08:54:03 Fujiantonio systemd[1]: systemd-sysctl.service: main process exited, code=exited, status=1/FAILURE
apr 14 08:54:03 Fujiantonio systemd[1]: Failed to start Apply Kernel Variables.
apr 14 08:54:03 Fujiantonio systemd[1]: Unit systemd-sysctl.service entered failed state.

Is this connected to any known bug??