Program: 20326
Project: 20326
Buggy source:
@Test public void whenFewTreadsDoDifferentWork() throws Throwable {
  TestThread runTestThread=new TestThread(run);
  TestThread runTestThread2=new TestThread(run2);
  TestThread isRunningTestThread=new TestThread(isRunning);
  TestThread isRunningTestThread2=new TestThread(isRunning2);
  TestThread stopTestThread=new TestThread(stop);
  TestThread stopTestThread2=new TestThread(stop2);
  Thread runThread=new Thread(runTestThread);
  Thread runThread2=new Thread(runTestThread2);
  Thread isRunningThread=new Thread(isRunningTestThread);
  Thread isRunningThread2=new Thread(isRunningTestThread2);
  Thread stopThread=new Thread(stopTestThread);
  Thread stopThread2=new Thread(stopTestThread2);
  try {
    runThread.start();
    Thread.sleep(10);
    isRunningThread.start();
    Thread.sleep(10);
    stopThread.start();
    while (runThread.isAlive() || isRunningThread.isAlive() || stopThread.isAlive()) {
    }
    if (runTestThread.throwable != null) {
      throw runTestThread.throwable;
    }
    if (isRunningTestThread.throwable != null) {
      throw isRunningTestThread.throwable;
    }
    if (stopTestThread.throwable != null) {
      throw stopTestThread.throwable;
    }
    assertTrue(runTestThread.result.equals("String_Node_Str"));
    assertTrue(isRunningTestThread.result.equals(true));
    assertTrue(stopTestThread.result.equals("String_Node_Str"));
    assertTrue(!service.isRunning());
    isRunningThread2.start();
    Thread.sleep(10);
    stopThread2.start();
    Thread.sleep(10);
    runThread2.start();
    while (runThread2.isAlive() || isRunningThread2.isAlive() || stopThread2.isAlive()) {
    }
    if (runTestThread2.throwable != null) {
      throw runTestThread.throwable;
    }
    if (isRunningTestThread2.throwable != null) {
      throw isRunningTestThread.throwable;
    }
    if (stopTestThread2.throwable != null) {
      throw stopTestThread.throwable;
    }
    assertTrue(isRunningTestThread2.result.equals(false));
    assertTrue(stopTestThread2.result.equals("String_Node_Str"));
    assertTrue(runTestThread2.result.equals("String_Node_Str"));
    assertTrue(service.isRunning());
  }
  finally {
    if (service.isRunning()) {
      service.stop();
    }
  }
}

Fixed version (ground truth):
@Test public void whenFewTreadsDoDifferentWork() throws Throwable {
  TestThread runTestThread=new TestThread(run);
  TestThread runTestThread2=new TestThread(run2);
  TestThread isRunningTestThread=new TestThread(isRunning);
  TestThread isRunningTestThread2=new TestThread(isRunning2);
  TestThread stopTestThread=new TestThread(stop);
  TestThread stopTestThread2=new TestThread(stop2);
  Thread runThread=new Thread(runTestThread);
  Thread runThread2=new Thread(runTestThread2);
  Thread isRunningThread=new Thread(isRunningTestThread);
  Thread isRunningThread2=new Thread(isRunningTestThread2);
  Thread stopThread=new Thread(stopTestThread);
  Thread stopThread2=new Thread(stopTestThread2);
  try {
    runThread.start();
    Thread.sleep(10);
    isRunningThread.start();
    Thread.sleep(10);
    stopThread.start();
    while (runThread.isAlive() || isRunningThread.isAlive() || stopThread.isAlive()) {
    }
    if (runTestThread.throwable != null) {
      throw runTestThread.throwable;
    }
    if (isRunningTestThread.throwable != null) {
      throw isRunningTestThread.throwable;
    }
    if (stopTestThread.throwable != null) {
      throw stopTestThread.throwable;
    }
    assertTrue("String_Node_Str".equals(runTestThread.result));
    assertTrue(Boolean.TRUE.equals(isRunningTestThread.result));
    assertTrue("String_Node_Str".equals(stopTestThread.result));
    assertFalse(service.isRunning());
    isRunningThread2.start();
    Thread.sleep(10);
    stopThread2.start();
    Thread.sleep(10);
    runThread2.start();
    while (runThread2.isAlive() || isRunningThread2.isAlive() || stopThread2.isAlive()) {
    }
    if (runTestThread2.throwable != null) {
      throw runTestThread.throwable;
    }
    if (isRunningTestThread2.throwable != null) {
      throw isRunningTestThread.throwable;
    }
    if (stopTestThread2.throwable != null) {
      throw stopTestThread.throwable;
    }
    assertTrue(Boolean.FALSE.equals(isRunningTestThread2.result));
    assertTrue("String_Node_Str".equals(stopTestThread2.result));
    assertTrue("String_Node_Str".equals(runTestThread2.result));
    assertTrue(service.isRunning());
  }
  finally {
    if (service.isRunning()) {
      service.stop();
    }
  }
}