OPNsense opnsense: /interfaces_vlan_edit.php: The command `/sbin/ifconfig 'em2_vlan1' vlandev 'em2' vlan '1' vlanpcp '0'' failed to execute
OPNsense opnsense: /interfaces_vlan_edit.php: The command '/usr/sbin/ngctl name 'vlan1': 'em2_vlan2'' returned exit code '71', the output was 'ngctl: send msg: No such file or directory'

interface_bring_down() doesn't use a real interface name as call argument, mwexecf('/usr/sbin/ngctl name %s: %s', array($tmpvlanif, $vlanif)) isn't used by my knowledge.