#fixed code
                              @Test
  public void testCloseByInterrupt() throws Exception {
    RegularFile file = regularFile(10);
    final FileChannel channel = channel(file, READ, WRITE);

    file.writeLock().lock(); // ensure all operations on the channel will block

    ExecutorService executor = Executors.newCachedThreadPool();

    final CountDownLatch threadStartLatch = new CountDownLatch(1);
    final SettableFuture<Throwable> interruptException = SettableFuture.create();

    // This thread, being the first to run, will be blocking on the interruptible lock (the byte
    // file's write lock) and as such will be interrupted properly... the other threads will be
    // blocked on the lock that guards the position field and the specification that only one method
    // on the channel will be in progress at a time. That lock is not interruptible, so we must
    // interrupt this thread.
    Thread thread = new Thread(new Runnable() {
      @Override
      public void run() {
        threadStartLatch.countDown();
        try {
          channel.write(ByteBuffer.allocate(20));
          interruptException.set(null);
        } catch (Throwable e) {
          interruptException.set(e);
        }
      }
    });
    thread.start();

    // let the thread start running
    threadStartLatch.await();
    // then ensure time for thread to start blocking on the write lock
    Uninterruptibles.sleepUninterruptibly(10, MILLISECONDS);

    CountDownLatch blockingStartLatch = new CountDownLatch(BLOCKING_OP_COUNT);
    List<Future<?>> futures = queueAllBlockingOperations(channel, executor, blockingStartLatch);

    // wait for all blocking threads to start
    blockingStartLatch.await();
    // then ensure time for the operations to start blocking
    Uninterruptibles.sleepUninterruptibly(20, MILLISECONDS);

    // interrupting this blocking thread closes the channel and makes all the other threads
    // throw AsynchronousCloseException... the operation on this thread should throw
    // ClosedByInterruptException
    thread.interrupt();

    // get the exception that caused the interrupted operation to terminate
    assertThat(interruptException.get(200, MILLISECONDS))
        .named("interrupted thread exception")
        .isA(ClosedByInterruptException.class);

    // check that each other thread got AsynchronousCloseException (since the interrupt, on a
    // different thread, closed the channel)
    for (Future<?> future : futures) {
      try {
        future.get();
        fail();
      } catch (ExecutionException expected) {
        assertThat(expected.getCause()).named("blocking thread exception")
            .isA(AsynchronousCloseException.class);
      }
    }
  }
#vulnerable code 
                              @Test
  public void testCloseByInterrupt() throws IOException, InterruptedException {
    RegularFile file = regularFile(10);
    final FileChannel channel = channel(file, READ, WRITE);

    file.writeLock().lock(); // ensure all operations on the channel will block

    ExecutorService executor = Executors.newCachedThreadPool();

    final CountDownLatch latch = new CountDownLatch(1);
    final AtomicReference<Throwable> interruptException = new AtomicReference<>();

    // This thread, being the first to run, will be blocking on the interruptible lock (the byte
    // file's write lock) and as such will be interrupted properly... the other threads will be
    // blocked on the lock that guards the position field and the specification that only one method
    // on the channel will be in progress at a time. That lock is not interruptible, so we must
    // interrupt this thread.
    Thread thread = new Thread(new Runnable() {
      @Override
      public void run() {
        try {
          channel.write(ByteBuffer.allocate(20));
          latch.countDown();
        } catch (Throwable e) {
          interruptException.set(e);
          latch.countDown();
        }
      }
    });
    thread.start();

    // ensure time for thread to start blocking on the write lock
    Uninterruptibles.sleepUninterruptibly(5, MILLISECONDS);

    List<Future<?>> futures = queueAllBlockingOperations(channel, executor);

    // ensure time for operations to start blocking
    Uninterruptibles.sleepUninterruptibly(10, MILLISECONDS);

    // interrupting this blocking thread closes the channel and makes all the other threads
    // throw AsynchronousCloseException... the operation on this thread should throw
    // ClosedByInterruptException
    thread.interrupt();

    latch.await();
    assertTrue(interruptException.get() instanceof ClosedByInterruptException);

    for (Future<?> future : futures) {
      try {
        future.get();
        fail();
      } catch (ExecutionException expected) {
        assertTrue(expected.getCause() instanceof AsynchronousCloseException);
      }
    }
  } 
                            #location 3 
                            #vulnerability type THREAD_SAFETY_VIOLATION