message: Comment about potential for hang when attempting to retrieve the newest master token.
diff: @@ -554,6 +554,7 @@ void MslControl::shutdown()
  shared_ptr<MasterToken> MslControl::getNewestMasterToken(shared_ptr<MslContext> ctx)
  {
  + // FIXME: This can get stuck forever if there's no way to interrupt/abort.
  do {
  // Get the newest master token. If there is none then immediately
  // return.
  