Comment 1 for bug 1841481

Yup, we ran into this race in update_from_provider_tree as well, for which we made _clear_provider_cache_for_tree().

https://github.com/openstack/nova/blob/71478c3eedd95e2eeb219f47460603221ee249b9/nova/scheduler/client/report.py#L1330-L1341

We should invoke same when _refresh_associations fails.

...Possibly *from* _refresh_associations itself.

...Keeping in mind that that guy is recursive :)