[Bug 2088459] Re: Problems with NetworkManager and merging of existing configuration

[Danilo Egea Gondolfo]

** Also affects: network-manager (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: netplan.io (Ubuntu)
       Status: New => Triaged

** Changed in: network-manager (Ubuntu)
       Status: New => Triaged

** Changed in: netplan.io (Ubuntu)
   Importance: Undecided => Medium

** Changed in: network-manager (Ubuntu)
   Importance: Undecided => Medium

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Title:
  Problems with NetworkManager and merging of existing configuration

Status in netplan.io package in Ubuntu:
  Triaged
Status in network-manager package in Ubuntu:
  Triaged

Bug description:
  Merging existing configuration with newly created connections can lead
  to problems.

  See the scenario below:

  Existing configuration:

  # cat /etc/netplan/10-dummy.yaml
  network:
    dummy-devices:
      dummy0:
        renderer: NetworkManager
        addresses:
          - 192.168.0.1/24

  
  Adding a connection through nmcli for the same interface:

  # nmcli con add type dummy ifname dummy0
  Error: Failed to add 'dummy-dummy0' connection: Message recipient disconnected from message bus without replying

  
  Error:

  Nov 18 13:42:06 plucky-nm generate[8830]: Permissions for /etc/netplan/10-dummy.yaml are too open. Netplan configuration should NOT be accessible by others.
  Nov 18 13:42:07 plucky-nm NetworkManager[8623]: <error> [1731937327.2073] BUG: the profile cannot be stored in keyfile format without becoming unusable: invalid connection: ipv4.addresses: this property is not allowed for 'method=disabled'
  Nov 18 13:42:07 plucky-nm NetworkManager[8623]: **
  Nov 18 13:42:07 plucky-nm NetworkManager[8623]: nm:ERROR:../src/core/settings/plugins/keyfile/nms-keyfile-writer.c:551:<unknown-fcn>: assertion failed: (<dropped>)
  Nov 18 13:42:07 plucky-nm NetworkManager[8623]: Bail out! nm:ERROR:../src/core/settings/plugins/keyfile/nms-keyfile-writer.c:551:<unknown-fcn>: assertion failed: (<dropped>)
  Nov 18 13:42:07 plucky-nm systemd[1]: NetworkManager.service: Main process exited, code=dumped, status=6/ABRT
  Nov 18 13:42:07 plucky-nm systemd[1]: NetworkManager.service: Failed with result 'core-dump'.
  Nov 18 13:42:07 plucky-nm systemd[1]: NetworkManager.service: Scheduled restart job, restart counter is at 1.
  Nov 18 13:42:07 plucky-nm systemd[1]: Starting NetworkManager.service - Network Manager...

  
  Trying to cope with the existing configuration doesn't help a lot:

  # nmcli con add type dummy ifname dummy0 ipv4.method manual ipv4.address 192.168.0.1/24
  Error: Failed to add 'dummy-dummy0' connection: Message recipient disconnected from message bus without replying

  
  In this case the error is not even clear:

  
  Nov 18 13:49:59 plucky-nm generate[1156]: Permissions for /etc/netplan/10-dummy.yaml are too open. Netplan configuration should NOT be accessible by others.
  Nov 18 13:49:59 plucky-nm NetworkManager[810]: **
  Nov 18 13:49:59 plucky-nm NetworkManager[810]: nm:ERROR:../src/core/settings/nm-settings-utils.c:103:<unknown-fcn>: assertion failed: (<dropped>)
  Nov 18 13:49:59 plucky-nm NetworkManager[810]: Bail out! nm:ERROR:../src/core/settings/nm-settings-utils.c:103:<unknown-fcn>: assertion failed: (<dropped>)
  Nov 18 13:49:59 plucky-nm systemd[1]: NetworkManager.service: Main process exited, code=dumped, status=6/ABRT
  Nov 18 13:49:59 plucky-nm systemd[1]: NetworkManager.service: Failed with result 'core-dump'.
  Nov 18 13:49:59 plucky-nm systemd[1]: NetworkManager.service: Scheduled restart job, restart counter is at 1.
  Nov 18 13:49:59 plucky-nm systemd[1]: Starting NetworkManager.service - Network Manager...


  Applying the configuration works anyway:

  root at plucky-nm:~# netplan apply
  root at plucky-nm:~# nmcli con show
  NAME                UUID                                  TYPE      DEVICE
  Wired connection 1  65bff577-bc73-38c1-8b95-e0acf92e0913  ethernet  enp5s0
  dummy-dummy0        354ebe07-b386-42fb-ab8b-ee8c3486d033  dummy     dummy0
  lo                  9b307900-2954-4e7c-b63e-c7246d1cecfc  loopback  lo
  root at plucky-nm:~# netplan get
  network:
    version: 2
    dummy-devices:
      dummy0:
        renderer: NetworkManager
        addresses:
        - "192.168.0.1/24"
        networkmanager:
          uuid: "354ebe07-b386-42fb-ab8b-ee8c3486d033"
          name: "dummy-dummy0"
          passthrough:
            proxy: {}
            ipv6:
              addr-gen-mode: "default"
              method: "disabled"
              ip6-privacy: "-1"
            dummy: {}

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