As of recent development in a few tickets, Clients can now have their Service fields temporarily modified to reflect a change in role. This means that reads from a Client's service field (i.e., using getService()) need to be synchronized with writes to it. BF-32086 is the result of such a read being unsynchronized (in the case of that BF, from Service::LockedClientsCursor which iterates over the Clients of a ServiceContext and pulls out the ones that match a particular Service). Investigate the code base for other such unsynchronized reads and resolve them.