Indeed, the bahaviour changed after adding that line:
10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering POST, /volumes/umount” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering POST, /snapshots/create” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering POST, /backups/create” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering DELETE, /volumes/” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering DELETE, /snapshots/” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering DELETE, /backups” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.Path” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.Get” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.List” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /Plugin.Activate” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.Create” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.Remove” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.Mount” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=debug msg=“Registering plugin handler POST, /VolumeDriver.Unmount” pkg=daemon10/19/2016 6:32:55 AMtime=“2016-10-19T04:32:55Z” level=warning msg=“Remove previous sockfile at /host/var/run/convoy-convoy-nfs.sock” pkg=daemon10/19/2016 7:11:13 AMtime=“2016-10-19T05:11:13Z” level=debug msg=“Handle plugin list volume: POST /VolumeDriver.List” pkg=daemon10/19/2016 7:11:13 AMtime=“2016-10-19T05:11:13Z” level=debug msg=“Successfully got volume list for docker.” pkg=daemon10/19/2016 7:11:13 AMtime=“2016-10-19T05:11:13Z” level=debug msg=“Response: {}” pkg=daemon10/19/2016 8:15:10 AMWaiting for metadata10/19/2016 8:15:11 AMtime=“2016-10-19T06:15:11Z” level=info msg="Execing [/usr/bin/nsenter --mount=/proc/15289/ns/mnt -F – /var/lib/docker/aufs/mnt/62fe8e55b40d979387aafc79365027206b1f5e0093d24604ed325889818d4492/var/lib/rancher/convoy-agent/share-mnt --stage2 /var/lib/rancher/convoy/convoy-nfs-294d5998-2611-431b-b23b-16290748f843 – /launch volume-agent-nfs-internal 15289]"10/19/2016 8:15:11 AMRegistering convoy socket at /var/run/convoy-convoy-nfs.sock10/19/2016 8:15:11 AMMounting at: /var/lib/rancher/convoy/convoy-nfs-294d5998-2611-431b-b23b-16290748f843/mnt
Will probably create an issue on github …