There is a data race in the AuthorizationManagerImpl::_authEnabled flag when 
UnauthorizedSessionIsCoauthorizedWithAnybodyWhenAuthIsDisabled and AuthorizedSessionIsCoauthorizedNobodyWhenAuthIsDisabled call authzManager->setAuthEnabled(false) outside of initialization time. At the same time, the JournalFlusher thread is reading its value through isAuthEnabled().

This is an unintended use of _authEnabled, which currently allows unsynchronized accesses because it's only expected to be set once at initialization time. To allow these unit tests (and future tests) to safely reset its value, _authEnabled should be made an atomic.