Why does NetworkManager log 'Error in get_property: Method "Get" with signature "ss" on interface' to syslog on Red Hat Enterprise Linux 6 when unloading network device driver ?

Issue

• Why does NetworkManager log 'Error in get_property: Method "Get" with signature "ss" on interface' to syslog on Red Hat Enterprise Linux 6 when unloading enic network device driver ?

   NetworkManager[3487]: <info> (eth19): carrier now OFF (device state 8, deferring action for 4 seconds)
   dhclient: receive_packet failed on eth19: Network is down
   NetworkManager[3487]: <info> (eth19): now unmanaged
   NetworkManager[3487]: <info> (eth19): device state change: 8 -> 1 (reason 36)
   NetworkManager[3487]: <info> (eth19): deactivating device (reason: 36).
   NetworkManager[3487]: <info> (eth19): canceled DHCP transaction, DHCP client pid 24492
   NetworkManager[3487]: <info> Policy set 'Auto eth15' (eth15) as default for IPv4 routing and DNS.
   NetworkManager[3487]: <info> Policy set 'Auto eth15' (eth15) as default for IPv4 routing and DNS.
   NetworkManager[3487]: <info> (eth19): cleaning up...
   nm-dispatcher.action: Error in get_property: Method "Get" with signature "ss" on interface "org.freedesktop.DBus.Properties" doesn't exist#012
   kernel: enic 0000:1a:00.0: PCI INT A disabled