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)
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