After taking another look at this I noticed that the function where we create the Netplan YAML is called when the connection is created AND when the connection is going down as though it was being updated.
The first time it's called the parameters is_volatile, is_nm_generated and is_external are all set to true so we skip the libnetplan calls. Although when it's called when the connection is going down they are all false. And that's when the Netplan file is created and network-manager gets to a point in the code it shouldn't reach, so it crashes and the files are never removed. Not sure if calling the plugin writer in this case is a bug or not as the connection is volatile and is going to be deleted anyway. Maybe lost tracking of the connection nature (volatile, nm_generated and external) is the actual bug, not sure yet. One way to work around this is generating Netplan YAMLs regardless if the connection is volatile. If network-manager will create a file for it we could create a file for Netplan too. In fact, after removing the conditions to call libnetplan, the files are created and deleted when the OpenVPN client and/or server is stopped. Note that from network-manager 1.42.0 on, even the loopback interface can be represented as a connection, so we will have a Netplan file for it as well. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1998207 Title: netplan network-manager plugin tries to save temporary connections Status in netplan: Triaged Status in network-manager package in Ubuntu: Triaged Bug description: *** Note: This bug is mostly about comment #10, now *** When creating an OpenVPN connection, a temporal connection called tunN is created. For instance, after activating a connection called vpntest, I have: NAME UUID TYPE DEVICE vpntest 458856e6-8f0f-4dc6-82f2-dd72868252a0 vpn ens3 tun0 1eb1dbe8-5678-4818-9adf-fb2dc01ed132 tun tun0 tun0 is created/removed after activating/deactivating vpntest and should not really be saved, but I see netplan adding it in /etc/netplan. And while doing so the plugin also reports some errors (I see these when stopping the connection): Nov 28 16:16:57 ubuntu NetworkManager[11752]: <error> [1669652217.2920] BUG: the profile cannot be stored in keyfile format without becoming unusable: cannot access file: No such file or directory Nov 28 16:16:57 ubuntu NetworkManager[11752]: ((src/libnm-core-impl/nm-connection.c:342)): assertion '<dropped>' failed Nov 28 16:16:57 ubuntu NetworkManager[11752]: <warn> [1669652217.2920] keyfile: commit: failure to write 1eb1dbe8-5678-4818-9adf-fb2dc01ed132 ((null)) to "/run/NetworkManager/system-connections/tun0-1eb1dbe8-5678-4818-9adf-fb2dc01ed132.nmconnection": keyfile writer produces an invalid connection: cannot access file: No such file or directory To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1998207/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
