I think I've found another way to reproduce the problem.
I installed docker in a VM and it created its "docker0" interface. Then
I changed the property ignore-auto-routes for the transient connection
Network Manager created for the docker0 interface.
By doing that, the connection will be turned into a persistent
connection. So far nothing crashed.
The problem happened when I rebooted the VM, even though there is a
persistent connection for docker0, Network Manager will create a new
transient one:
# nmcli -f name,uuid,filename connection show
NAME UUID FILENAME
lo 72244b8b-262f-4ff4-b473-c3555f6eddb8
/run/NetworkManager/system-connections/lo.nmconnection
docker0 cfc97cd8-f11e-4067-a3f3-920f44d24475
/run/NetworkManager/system-connections/docker0.nmconnection
docker0 4f89b08a-1454-459e-b6f6-7d10f21c9644
/run/NetworkManager/system-connections/netplan-docker0.nmconnection
netplan-wlan0-mynetwork 56c626d3-3b3a-38e6-9ecc-ae103ea78e0f
/run/NetworkManager/system-connections/netplan-wlan0-mynetwork.nmconnection
Now if I try to change the first one, it will be persisted and will point to
the same filename. That's where it crashes:
# nmcli con modify cfc97cd8-f11e-4067-a3f3-920f44d24475 ipv4.ignore-auto-routes
yes
Error: Failed to modify connection 'docker0': Message recipient disconnected
from message bus without replying
If this is the scenario people have in their systems, the forticlient software
might be trying to change that option for all the connections it finds (to
workaround some problem maybe) and causing the crash. The persistent connection
might have been created by a previous run of the forticlient software.
When one asks Network Manager to not manage those external interfaces,
transient connections will not be created so the problem will not
happen.
It seems this workaround also helps:
# cat /etc/NetworkManager/NetworkManager.conf
...
[device]
wifi.scan-rand-mac-address=no
keep-configuration=no
Add "keep-configuration=no" to the [device] section. With this, Network
Manager will not create transient connections for external interfaces.
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https://bugs.launchpad.net/bugs/2089930
Title:
NetworManager crashes when modifing connection (ipv4.ignore-auto-
routes yes)
Status in Netplan:
New
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
When trying to connect with forticlient to an SSL-VPN, the connection will
fail with "Config DNS failed"
Then i was searching in logs of forticlient and found:
20241127 07:07:55.291 TZ=+0100 [sslvpn:EROR] nmtools:255 Command to set
ipv4.ignore-auto-routes returned with status 256.
20241127 07:07:55.291 TZ=+0100 [sslvpn:EROR] nmtools:1060 Failed to modify
connection mpqemubr0 property ipv4.ignore-auto-routes
20241127 07:07:55.291 TZ=+0100 [sslvpn:EROR] dns:1007 Failed to finish
Network Manager configuration
20241127 07:07:55.291 TZ=+0100 [sslvpn:EROR] vpn_connection:2071 Config DNS
failed
Next i was searching what this means.
So i tried to reproduce this - without forticlient.
And i can reproduce:
# find UUID
nmcli con show | grep mpqemubr0
mpqemubr0 afb3b269-839b-4ce1-9078-e8ad740b784e bridge mpqemubr0
# check current setting
nmcli con show afb3b269-839b-4ce1-9078-e8ad740b784e | grep
ipv4.ignore-auto-routes
ipv4.ignore-auto-routes: no
# change setting
nmcli con modify afb3b269-839b-4ce1-9078-e8ad740b784e ipv4.ignore-auto-routes
yes
Error: Failed to modify connection 'mpqemubr0': Message recipient
disconnected from message bus without replying
set logging for NetworkManager to trace for all domains i see this:
Nov 29 09:57:10 myhost NetworkManager[98631]: <trace> [1732870630.7383] auth:
call[4]: completed: authorized=1, challenge=0
Nov 29 09:57:10 myhost NetworkManager[98631]: <debug> [1732870630.7385]
audit: socket created
Nov 29 09:57:10 myhost NetworkManager[98631]: <debug> [1732870630.7385]
create NMAuditManager singleton (7794fbd712da6ac4)
Nov 29 09:57:10 myhost NetworkManager[98631]: <trace> [1732870630.7386]
settings: add-connection: failed to add
afb3b269-839b-4ce1-9078-e8ad740b784e/'mpqemubr0': settings plugin does not
support adding connections
Nov 29 09:57:10 myhost generate[99193]: nm-device:
NM-2a2a93e2-e395-4291-8c71-b4c90d5b8211: the renderer for nm-devices must be
NetworkManager, it will be used instead of the defined one.
Nov 29 09:57:10 myhost generate[99193]: nm-device:
NM-649ca4e6-0058-4ca4-8b13-b2b386326d64: the renderer for nm-devices must be
NetworkManager, it will be used instead of the defined one.
Nov 29 09:57:10 myhost generate[99193]: nm-device:
NM-9fe9febf-03de-4534-b27d-e4f309760a10: the renderer for nm-devices must be
NetworkManager, it will be used instead of the defined one.
Nov 29 09:57:11 myhost NetworkManager[98631]: <trace> [1732870631.8468]
keyfile: commit: afb3b269-839b-4ce1-9078-e8ad740b784e (mpqemubr0) added as
"/run/NetworkManager/system-connections/netplan-mpqemubr0.nmconnection"
Nov 29 09:57:11 myhost NetworkManager[98631]: **
Nov 29 09:57:11 myhost NetworkManager[98631]:
nm:ERROR:src/core/settings/nm-settings-utils.c:103:<unknown-fcn>: assertion
failed: (<dropped>)
Nov 29 09:57:11 myhost NetworkManager[98631]: Bail out!
nm:ERROR:src/core/settings/nm-settings-utils.c:103:<unknown-fcn>: assertion
failed: (<dropped>)
Nov 29 09:57:12 myhost systemd[1]: NetworkManager.service: Main process
exited, code=dumped, status=6/ABRT
Nov 29 09:57:12 myhost systemd[1]: NetworkManager.service: Failed with result
'core-dump'.
Nov 29 09:57:12 myhost systemd[1]: NetworkManager.service: Scheduled restart
job, restart counter is at 2.
Nov 29 09:57:12 myhost systemd[1]: Starting NetworkManager.service - Network
Manager...
The interface mpqemubr0 is coming from multipass 1.14.1
1) The release of Ubuntu you are using, via 'lsb_release -rd' or
System -> About Ubuntu
Description: Ubuntu 24.04.1 LTS
Release: 24.04
2) The version of the package you are using, via 'apt-cache policy
pkgname' or by checking in Software Center
network-manager: 1.46.0-1ubuntu2
nmcli tool : 1.46.0
3) What you expected to happen
- nmcli-action is working
- NetworkManager is not crashing/dumping with "NetworkManager.service: Main
process exited, code=dumped, status=6/ABRT" and then restarting
- VPN connection is working/useable
4) What happened instead
- wanted nmcli action is not working
- VPN is not working
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: network-manager 1.46.0-1ubuntu2
ProcVersionSignature: Ubuntu 6.8.0-49.49-generic 6.8.12
Uname: Linux 6.8.0-49-generic x86_64
NonfreeKernelModules: zfs
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
CasperMD5CheckResult: pass
Date: Fri Nov 29 14:37:40 2024
ExecutablePath: /usr/sbin/NetworkManager
InstallationDate: Installed on 2024-10-13 (47 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-nm:
RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW
WIFI WWAN-HW WWAN
running 1.46.0 connected started full enabled missing
enabled missing enabled
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