guests are not migrating and fails to start with this "ibvirt.libvirtError: internal error: no internalFlags support" error

Issue

• After completing the a RHOSP 16.2 to RHOSP 17.1 FFU, resizing instance fails with the following error message:

| fault                               | {'code': 500, 'created': '2025-06-05T17:39:59Z', 'message': 'libvirtError', 'details': 'Traceback (most recent call last):\n  File "/usr/lib/python3.
9/site-packages/nova/compute/manager.py", line 202, in decorated_function\n    return function(self, context, *args, **kwargs)\n  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3867, in reboot_instance\n    do_reboot_instance(context, instance, block_device_info, reboot_type)\n  File "/usr/lib/python3.9/site-packages/oslo_concurrency/lockutils.py", line 360, in inner\n    return f(*args, **kwargs)\n  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3865, in do_reboot_instance\n    self._reboot_instance(context, instance, block_device_info,\n  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3959, in _reboot_instance\n    self._set_instance_obj_error_state(instance)\n  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__\n    self.force_reraise()\n  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise\n    raise self.value\n  File "/usr/lib/python3.9/site-packages/nova/compute/manager.py", line 3929, in _reboot_instance\n    self.driver.reboot(context, instance,\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 3766, in reboot\n    return self._hard_reboot(context, instance, network_info,\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 3901, in _hard_reboot\n    self._create_guest_with_network(\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 7407, in _create_guest_with_network\n    self._cleanup(\n  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__\n    self.force_reraise()\n  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise\n    raise self.value\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 7376, in _create_guest_with_network\n    guest = self._create_guest(\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/driver.py", line 7316, in _create_guest\n    guest.launch(pause=pause)\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/guest.py", line 168, in launch\n    LOG.exception(\'Error launching a defined domain with XML: %s\',\n  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 227, in __exit__\n    self.force_reraise()\n  File "/usr/lib/python3.9/site-packages/oslo_utils/excutils.py", line 200, in force_reraise\n    raise self.value\n  File "/usr/lib/python3.9/site-packages/nova/virt/libvirt/guest.py", line 165, in launch\n    return self._domain.createWithFlags(flags)\n  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 190, in doit\n    result = proxy_call(self._autowrap, f, *args, **kwargs)\n  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 148, in proxy_call\n    rv = execute(f, *args, **k
wargs)\n  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 129, in execute\n    six.reraise(c, e, tb)\n  File "/usr/lib/python3.9/site-packages/six.py", line 709, in reraise\n    raise value\n  File "/usr/lib/python3.9/site-packages/eventlet/tpool.py", line 83, in tworker\n    rv = meth(*args, **kwargs)\n  File "/usr/lib64/python3.9/site-packages/libvirt.py", line 1409, in createWithFlags\n    raise libvirtError(\'virDomainCreateWithFlags() failed\')\nlibvirt.libvirtError: internal error: no internalFlags support\n'}