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

• db/repl/replication_coordinator_external_state_impl.cpp
  • 360,19:     _writerPool = makeReplWriterPool();
• db/repl/replication_recovery.cpp
  • 715,23:     auto writerPool = makeReplWriterPool();
• db/repl/replication_coordinator_external_state_impl.cpp
  • 355,30:     _oplogApplierTaskExecutor->startup();
• db/read_write_concern_defaults.cpp
  • 335,16:     _threadPool.startup();

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