[RHEL] Network Manager Restart due to Memory Error

Issue

• Multiple interface went down and came up on this Openstack compute running on RHEL 7.3.

  Nov 21 09:22:21 abc.linux.lan.infra.ftgroup NetworkManager[1290]: <info>  [1511256141.0250] dns-mgr[0x7f5dfa3c5040]: init: dns=default, rc-manager=file
  Nov 21 09:22:21 abc.linux.lan.infra.ftgroup systemd[1]: Started Network Manager.
  Nov 21 09:22:21 abc.linux.lan.infra.ftgroup systemd[1]: Starting Network Manager Wait Online...
  Nov 21 09:22:21 abc.linux.lan.infra.ftgroup dbus-daemon[1220]: dbus[1220]: [system] Activating via systemd: service name='lan.abc.nm_dispatcher' unit='dbus-lan.abc.nm-dispatcher.service'