OK, I have a suspicion of what's going on here. I've compared two
systems: one launched with the network config above (and
updated/rebooted), and one launched with that config minus the
"openvswitch: {{}}" line.
When I compare /sys/class/net/ovs-br.100/addr_assign_type in the two
systems, I see that on the OpenVSwitch-enabled system, it is 3 ("set
using dev_set_mac_address") whereas in the non-OVS system, it is 2
("stolen from another device"). (Descriptions of those values come from
https://www.kernel.org/doc/Documentation/ABI/testing/sysfs-class-net.)
The function which raises the exception
(get_interfaces_by_mac_on_linux[0]) calls get_interfaces[1] to get the
list of interfaces it should consider. get_interfaces will exclude all
interfaces with an addr_assign_type of 2 (via interface_has_own_mac[2]).
It will also explicitly exclude VLANs (via is_vlan[3], which checks for
DEVTYPE=vlan in /sys/class/net/<iface>/uevent): this check is also not
triggered because the /uevent on the OVS system does not have
DEVTYPE=vlan in it.
I'm not particularly familiar with OVS: is it somehow expected that this
VLAN will not be presented via /sys/class/net as other VLANs are? Or
does this suggest that there's a bug in something below cloud-init which
isn't correctly configuring this VLAN (which cloud-init then cannot
detect as a VLAN, and so fails)?
[0]
https://github.com/canonical/cloud-init/blob/master/cloudinit/net/__init__.py#L831
[1]
https://github.com/canonical/cloud-init/blob/master/cloudinit/net/__init__.py#L855
[2]
https://github.com/canonical/cloud-init/blob/master/cloudinit/net/__init__.py#L523
[3]
https://github.com/canonical/cloud-init/blob/master/cloudinit/net/__init__.py#L268
(As an aside: both my understanding of the problem and a test of a
revert suggest that this isn't a regression caused by
https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1912844.)
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https://bugs.launchpad.net/bugs/1912844
Title:
Bond with OVS bridging RuntimeError: duplicate mac found!
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