docs: public static boolean lockingVows() {
          List<InitiatorMailbox> lockedMailboxes = new ArrayList<InitiatorMailbox>();
          for (InitiatorMailbox im : m_allInitiatorMailboxes) {
              if (Thread.holdsLock(im)) {
                  lockedMailboxes.add(im);
              }
          }
          if (lockedMailboxes.size() > 1) {
              String msg = "Unexpected concurrency error, a thread locked two initiator mailboxes. ";
              msg += "Mailboxes for site id/partition ids ";
              boolean first = true;
              for (InitiatorMailbox m : lockedMailboxes) {
                  msg += CoreUtils.hsIdToString(m.m_hsId) + "/" + m.m_partitionId;
                  if (!first) {
                      msg += ", ";
                  }
                  first = false;
              }
              VoltDB.crashLocalVoltDB(msg, true, null);
          }
          return true;
      }