The same issue was reproduced on MAAS 2.9.0beta5 (visible in rackd.log) running in a virtual as a standard package (not snap):
2020-10-20 18:16:32 provisioningserver.rackdservices.dhcp_probe_service: [info] Probe for external DHCP servers started on interfaces: mgmt0, docker0, bond0, cni0. 2020-10-20 18:17:12 provisioningserver.rackdservices.dhcp_probe_service: [info] External DHCP probe complete. 2020-10-20 18:21:32 twisted.internet.defer: [critical] Unhandled error in Deferred: 2020-10-20 18:21:32 twisted.internet.defer: [critical] Traceback (most recent call last): Failure: twisted.internet.error.MulticastJoinError: (b'\xe0\x00\x00v', b'\xc0\xa8\x14\x05', 98, 'Address already in use')
I don't believe this issue should be marked as duplicate of the bug #1788780 or its resolution should be revisited.
The same issue was reproduced on MAAS 2.9.0beta5 (visible in rackd.log) running in a virtual as a standard package (not snap):
2020-10-20 18:16:32 provisioningser ver.rackdservic es.dhcp_ probe_service: [info] Probe for external DHCP servers started on interfaces: mgmt0, docker0, bond0, cni0. ver.rackdservic es.dhcp_ probe_service: [info] External DHCP probe complete. internet. defer: [critical] Unhandled error in Deferred: internet. defer: [critical] internet. error.Multicast JoinError: (b'\xe0\x00\x00v', b'\xc0\ xa8\x14\ x05', 98, 'Address already in use')
2020-10-20 18:17:12 provisioningser
2020-10-20 18:21:32 twisted.
2020-10-20 18:21:32 twisted.
Traceback (most recent call last):
Failure: twisted.
I don't believe this issue should be marked as duplicate of the bug #1788780 or its resolution should be revisited.