netplan.script crashed with AttributeError in __getitem__(): /usr/bin/python3: undefined symbol: netplan_get_id_from_nm_filename

[Chris Guiver]

ubuntu desktop (mantic) live test on dell optiplex 780
- dell [optiplex] 780 (c2q-q9400, 8gb, amd/ati cedar radeon hd 5000/6000/7350/8350)

exploring the /var/crash/ directory I noticed this report; nothing had appeared on screen, so just filed it with `ubuntu-bug`.

ProblemType: Crash
DistroRelease: Ubuntu 23.10
Package: netplan.io 0.106.1-8
Uname: Linux 6.3.0-7-generic x86_64
Architecture: amd64
Date: Mon Aug 28 08:12:32 2023
ExecutablePath: /usr/share/netplan/netplan.script
ExecutableTimestamp: 1684343476
InterpreterPath: /usr/bin/python3.11
ProcCmdline: /usr/bin/python3 /usr/sbin/netplan generate
ProcCwd: /
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
PythonArgs: ['/usr/sbin/netplan', 'generate']
SourcePackage: netplan.io
UserGroups: N/A

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
https://iso.qa.ubuntu.com/qatracker/reports/bugs/2033259

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Lukas Märdian (slyon)]

I wonder if we can reproduce this issue on 0.107, which is now in Mantic?

The /usr/share/netplan/netplan/libnetplan.py file (where the crash happens) is not part of the new 0.107 release anymore. And the new CFFI bindings will not allow compilation if the symbol would be missing.

[Lukas Märdian (slyon)]

It might be NetworkManager (or cloud-init) calling "netplan generate" during an upgrade/installation of packages, when libnetplan is already upgraded to >= v1.0 (libnetplan1), while netplan.io (the Python bits) are still on the old version (v0.106/v0.107)...

[Lukas Märdian (slyon)]

Unsing a Jammy system and installing libnetplan1 from Noble leads to this issue. When network-manager is installed in that context, it also triggers the crash:

root@jj-nn-np-nm-crash:~# dpkg -l | grep netplan
ii libnetplan0:amd64 0.106.1-7ubuntu0.22.04.4 amd64 YAML network configuration abstraction runtime library
ii libnetplan1:amd64 1.0.1-1ubuntu2~24.04.1 amd64 Declarative network configuration runtime library
ii netplan.io 0.106.1-7ubuntu0.22.04.4 amd64 YAML network configuration abstraction for various backends

root@jj-nn-np-nm-crash:~# netplan generate
Traceback (most recent call last):
  File "/usr/sbin/netplan", line 20, in <module>
    from netplan import Netplan
  File "/usr/share/netplan/netplan/__init__.py", line 18, in <module>
    from netplan.cli.core import Netplan
  File "/usr/share/netplan/netplan/cli/core.py", line 24, in <module>
    import netplan.cli.utils as utils
  File "/usr/share/netplan/netplan/cli/utils.py", line 27, in <module>
    import netplan.libnetplan as np
  File "/usr/share/netplan/netplan/libnetplan.py", line 54, in <module>
    lib.netplan_get_id_from_nm_filename.restype = ctypes.c_char_p
  File "/usr/lib/python3.10/ctypes/__init__.py", line 387, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib/python3.10/ctypes/__init__.py", line 392, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: /lib/x86_64-linux-gnu/libnetplan.so.1: undefined symbol: netplan_get_id_from_nm_filename

root@jj-nn-np-nm-crash:~# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.4 LTS
Release: 22.04
Codename: jammy

root@jj-nn-np-nm-crash:~# ll /var/crash/_usr_share_netplan_netplan.script.0.crash
-rw-r----- 1 root root 31274 Sep 12 14:37 /var/crash/_usr_share_netplan_netplan.script.0.crash

The installation of "network-manager" succeeds, but the crash can then be observed.

root@jj-nn-np-nm-crash:~# apt install network-manager
[...]
root@jj-nn-np-nm-crash:~# systemctl status NetworkManager
● NetworkManager.service - Network Manager
     Loaded: loaded (/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 2024-09-12 14:38:17 UTC; 1min 50s ago
       Docs: man:NetworkManager(8)
   Main PID: 4993 (NetworkManager)
      Tasks: 4 (limit: 28393)
     Memory: 3.0M
        CPU: 444ms
     CGroup: /system.slice/NetworkManager.service
             └─4993 /usr/sbin/NetworkManager --no-daemon

Sep 12 14:38:17 jj-nn-np-nm-crash NetworkManager[5021]: lib.netplan_get_id_from_nm_filename.restype = ctypes.c_char_p
Sep 12 14:38:17 jj-nn-np-nm-crash NetworkManager[5021]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Sep 12 14:38:17 jj-nn-np-nm-crash NetworkManager[5021]: File "/usr/lib/python3.12/ctypes/__init__.py", line 392, in __getattr__
Sep 12 14:38:17 jj-nn-np-nm-crash NetworkManager[5021]: func = self.__getitem__(name)
Sep 12 14:38:17 jj-nn-np-nm-crash NetworkManager[5021]: ^^^^^^^^^^^^^^^^^^^^^^
Sep 12 14:38:17 jj-nn-np-nm-crash NetworkManager[5021]: File...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.