output: #fixed code
                                public void send(PeerMessage message) throws IllegalStateException {
      logger.trace("Sending msg {} to {}", message.getType(), this);
      if (this.isConnected()) {
        ByteBuffer data = message.getData();
        data.rewind();
        connectionManager.offerWrite(new WriteTask(socketChannel, data, new WriteListener() {
          @Override
          public void onWriteFailed(String message, Throwable e) {
            logger.debug(message, e);
            unbind(true);
          }
  
          @Override
          public void onWriteDone() {
          }
        }), 1, TimeUnit.SECONDS);
      } else {
        logger.info("Attempting to send a message to non-connected peer {}!", this);
        unbind(true);
      }
    }
input: #vulnerable code 
                                public void send(PeerMessage message) throws IllegalStateException {
      logger.trace("Sending msg {} to {}", message.getType(), this);
      if (this.isConnected()) {
        ByteBuffer data = message.getData();
        data.rewind();
        boolean writeTaskAdded = connectionManager.offerWrite(new WriteTask(socketChannel, data, new WriteListener() {
          @Override
          public void onWriteFailed(String message, Throwable e) {
            logger.debug(message, e);
            unbind(true);
          }
  
          @Override
          public void onWriteDone() {
          }
        }), 1, TimeUnit.SECONDS);
        if (!writeTaskAdded) {
          unbind(true);
        }
      } else {
        logger.info("Attempting to send a message to non-connected peer {}!", this);
        unbind(true);
      }
    } 
                              #location 6 
                              #vulnerability type THREAD_SAFETY_VIOLATION