In the following files, there exist executors that may not be properly shutdown by calling both join and shutdown.

• db/free_mon/free_mon_mongod.cpp
  • 97,18:         _executor->startup();
• util/net/ocsp/ocsp_manager.cpp
  • 103,14:         _pool->startup();
• db/auth/authorization_manager_impl.cpp
  • 259,16:     _threadPool.startup();
• util/net/ssl_manager_openssl.cpp
  • 1122,20:         _threadPool.startup();
• db/modules/enterprise/src/ldap/connections/ldap_connection_reaper.cpp
  • 55,59:         std::call_once(_initExecutor, [this]() { _executor->startup(); });

To reference the full list of files/executors combed, please refer to the linked BF ticket.