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Network constantantly reloading

I’ve been having issues for the last few days with constant network dropouts and alarms showing up on my netdata monitoring. Netdata is running on my docker server (along with a few other things) and there have been ongoing issues with ubiquity, the server of which is running on this machine as well.

I’ve just looked in the logs and I can see a constant stream of messages being written that seem to indicate that the networking is totally screwed up.

The log messages are like this

Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: WARNING:Unknown index 274763 seen, reloading interface list                                                                                                                                            Jun  9 14:11:43 dockerhost systemd-udevd[1675399]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.                                                                                                                     Jun  9 14:11:43 dockerhost systemd-udevd[1675405]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.                                                                                                                     Jun  9 14:11:43 dockerhost systemd-networkd[646]: vethd42a850: Link UP                                                                                                                                                                                      Jun  9 14:11:43 dockerhost systemd-udevd[1675405]: Using default interface naming scheme 'v245'.                                                                                                                                                            Jun  9 14:11:43 dockerhost systemd-udevd[1675399]: vethd42a850: Could not generate persistent MAC: No data available                                                                                                                                        Jun  9 14:11:43 dockerhost kernel: [404650.029766] docker_gwbridge: port 9(vethd42a850) entered blocking state                                                                                                                                              Jun  9 14:11:43 dockerhost kernel: [404650.029769] docker_gwbridge: port 9(vethd42a850) entered disabled state                                                                                                                                              Jun  9 14:11:43 dockerhost kernel: [404650.029992] device vethd42a850 entered promiscuous mode                                                                                                                                                              Jun  9 14:11:43 dockerhost kernel: [404650.030873] docker_gwbridge: port 9(vethd42a850) entered blocking state                                                                                                                                              Jun  9 14:11:43 dockerhost kernel: [404650.030875] docker_gwbridge: port 9(vethd42a850) entered forwarding state
Jun  9 14:11:43 dockerhost systemd-udevd[1675405]: veth3da96b6: Could not generate persistent MAC: No data available
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: ERROR:Unknown interface index 274763 seen even after reload
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: WARNING:Unknown index 274763 seen, reloading interface list
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: ERROR:Unknown interface index 274763 seen even after reload
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: WARNING:Unknown index 274766 seen, reloading interface list
Jun  9 14:11:43 dockerhost systemd-udevd[1675399]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.
Jun  9 14:11:43 dockerhost systemd-udevd[1675399]: veth2bb22b8: Could not generate persistent MAC: No data available
Jun  9 14:11:43 dockerhost kernel: [404650.100421] veth45779: renamed from veth2bb22b8
Jun  9 14:11:43 dockerhost systemd-networkd[646]: veth2bb22b8: Failed to wait for the interface to be initialized: No such device
Jun  9 14:11:43 dockerhost kernel: [404650.116329] br0: port 4(veth45779) entered blocking state
Jun  9 14:11:43 dockerhost kernel: [404650.116330] br0: port 4(veth45779) entered disabled state
Jun  9 14:11:43 dockerhost kernel: [404650.116424] device veth45779 entered promiscuous mode
Jun  9 14:11:43 dockerhost kernel: [404650.116578] br0: port 4(veth45779) entered blocking state
Jun  9 14:11:43 dockerhost kernel: [404650.116580] br0: port 4(veth45779) entered forwarding state
Jun  9 14:11:43 dockerhost systemd-udevd[1675405]: ethtool: autonegotiation is unset or enabled, the speed and duplex are not writable.
Jun  9 14:11:43 dockerhost systemd-udevd[1675405]: vethfa6bc19: Could not generate persistent MAC: No data available
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: WARNING:Unknown index 274767 seen, reloading interface list
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: ERROR:Unknown interface index 274767 seen even after reload
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: WARNING:Unknown index 274767 seen, reloading interface list
Jun  9 14:11:43 dockerhost networkd-dispatcher[672]: ERROR:Unknown interface index 274767 seen even after reload
Jun  9 14:11:43 dockerhost containerd[704]: time="2021-06-09T14:11:43.563159672+10:00" level=info msg="starting signal loop" namespace=moby path=/run/containerd/io.containerd.runtime.v2.task/moby/d607b3d5fbe7f583b30ed267b8d6277df2d21d8ee3ccda6af45daa4af12fcae0 pid=1675432
Jun  9 14:11:43 dockerhost kernel: [404650.536463] eth0: renamed from vethcddabeb
Jun  9 14:11:43 dockerhost kernel: [404650.552355] docker_gwbridge: port 9(vethd42a850) entered disabled state
Jun  9 14:11:43 dockerhost kernel: [404650.552529] br0: port 4(veth45779) entered disabled state
Jun  9 14:11:43 dockerhost kernel: [404650.552605] br0: port 6(veth45786) entered blocking state
Jun  9 14:11:43 dockerhost kernel: [404650.552606] br0: port 6(veth45786) entered forwarding state
etc etc...

This loop seems to be pretty constant and I guess is why things are not happy.

Any idea what this is? How to diagnose/fix? I don’t even know there to start, and my google skills aren’t helping.

Peter.