Instance live-migration fails with "address resolution failed for <hostname>:61152: Name or service not known" or "qemu-kvm: load of migration failed: Invalid argument" in RHOSO18

Issue

• On the source data plane node, the following error messages are found for the failed live-migration:

$ sudo journalctl --no-pager -u edpm_nova_compute
0e6440ba3c5c90521aa3cc1 5b0a5d4578b8427588c91c96097677dd - - default default] [instance: 73bd335d-1112-4b3b-b25a-e3654d2185b2] Migration operation has aborted
May 20 15:47:48 edpm-compute-0 nova_compute[329410]: 2025-05-20 15:47:48.476 2 ERROR nova.virt.libvirt.driver [None req-048c9af3-89be-40df-a74e-e7ff1e4906eb 4db849ab40e6440ba3c5c90521aa3cc1 5b0a5d4578b8427588c91c96097677dd - - default default] [instance: 9f572e8c-16ea-4dbb-a62d-c91ad4ac5073] Live Migration failure: operation failed: job 'migration out' failed: address resolution failed for edpm-compute-1:61152: Name or service not known: libvirt.libvirtError: operation failed: job 'migration out' failed: address resolution failed for edpm-compute-1:61152: Name or service not known
May 20 15:47:48 edpm-compute-0 nova_compute[329410]:     LOG.error("Live Migration failure: %s", e, instance=instance)
May 20 15:47:48 edpm-compute-0 nova_compute[329410]:     raise libvirtError('virDomainMigrateToURI3() failed')
May 20 15:47:48 edpm-compute-0 nova_compute[329410]: libvirt.libvirtError: operation failed: job 'migration out' failed: address resolution failed for edpm-compute-1:61152: Name or service not known

• Live-migraiton fails with the logs similar to the below even if manually adding the destination hostname to /etc/host on source data plane node as workaround.

Dec 10 18:43:58 edpm-compute-0 <user.info> nova_compute[1038271]:2025-12-10 18:43:58.289 2 DEBUG nova.virt.libvirt.driver [None req-ea9d7173-604b-4bdc-a9af-e7dc4834707d f52bab51e86c4531acaa464ee37201bb eff39359d36944f1b075fc9a95910cda - - default default] [instance: 9f572e8c-16ea-4dbb-a62d-c91ad4ac5073] Migration operation thread notification thread_finished /usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py:10915ESC[00m
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:Traceback (most recent call last):
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/hubs/hub.py", line 476, in fire_timers
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    timer()
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/hubs/timer.py", line 59, in __call__
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    cb(*args, **kw)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/event.py", line 175, in _do_send
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    waiter.switch(result)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/greenthread.py", line 221, in main
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    result = function(*args, **kwargs)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/nova/utils.py", line 654, in context_wrapper
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    return func(*args, **kwargs)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 10570, in _live_migration_operation
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    LOG.error("Live Migration failure: %s", e, instance=instance)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    self.force_reraise()
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    raise self.value
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 10558, in _live_migration_operation
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    guest.migrate(self._live_migration_uri(dest),
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/guest.py", line 642, in migrate
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    self._domain.migrateToURI3(
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 193, in doit
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    result = proxy_call(self._autowrap, f, *args, **kwargs)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 151, in proxy_call
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    rv = execute(f, *args, **kwargs)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 132, in execute
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    six.reraise(c, e, tb)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/six.py", line 709, in reraise
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    raise value
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 86, in tworker
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    rv = meth(*args, **kwargs)
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:  File "/usr/lib64/python3.9/site-packages/libvirt.py", line 2174, in migrateToURI3
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:    raise libvirtError('virDomainMigrateToURI3() failed')
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:libvirt.libvirtError: internal error: QEMU unexpectedly closed the monitor (vm='instance-00000032'): 2025-12-10T09:43:53.167568Z qemu-kvm: Not a migration stream
Dec 10 18:43:58 edpm-compute-0 <user.err> nova_compute[1038271]:2025-12-10T09:43:53.167625Z qemu-kvm: load of migration failed: Invalid argument