Program: 180299
Project: 180299
Buggy source:
@Override public VerificationResult call() throws Exception {
  if (threadId.currentId() == 0) {
    spawned=emit(spawner.spawn(initialSpace));
  }
  VerificationResult result=null;
  while (spawned != null) {
    currentIteration++;
    LOGGER.info("String_Node_Str" + threadId.currentId() + "String_Node_Str"+ currentIteration+ "String_Node_Str"+ spawned.size()+ "String_Node_Str"+ spawned.getSecondaryTrajectories().size()+ "String_Node_Str");
    SimulatedDataBlock<TrajectoryWithNeighborhood> simulated=simulator.simulate(simulationConfiguration,spawned);
    SimulatedDataBlock simulatedSecondary=null;
    if (spawned.getSecondaryTrajectories().size() > 0) {
      simulatedSecondary=simulator.simulate(simulationConfiguration,spawned.getSecondaryTrajectories());
    }
    VerifiedDataBlock<TrajectoryWithNeighborhood> verified=verifier.verify(simulated,property);
    if (result == null) {
      result=new VerifiedDataBlockResultAdapter(verified);
    }
 else {
      result=result.merge(new VerifiedDataBlockResultAdapter(verified));
    }
    if (iterationLimit != 0 && currentIteration == iterationLimit) {
      if (simulatedSecondary != null) {
        VerifiedDataBlock<Trajectory> verifiedSecondary=verifier.verify(simulatedSecondary,property);
        result=result.merge(new VerifiedDataBlockResultAdapter(verifiedSecondary));
      }
      LOGGER.warn("String_Node_Str" + threadId.currentId() + "String_Node_Str"+ iterationLimit+ "String_Node_Str");
      break;
    }
 else {
      DistanceCheckedDataBlock distanceChecked=distanceChecker.check(spawned.getConfiguration(),verified);
      if (simulatedSecondary.size() != 0) {
        VerifiedDataBlock<Trajectory> verifiedSecondary=verifier.verify(simulatedSecondary,property);
        result=result.merge(new VerifiedDataBlockResultAdapter(verifiedSecondary));
      }
      spawned=emit(spawner.spawn(spawned.getConfiguration(),distanceChecked));
    }
  }
  return result;
}

Fixed version (ground truth):
@Override public VerificationResult call() throws Exception {
  if (threadId.currentId() == 0) {
    spawned=emit(spawner.spawn(initialSpace));
  }
  VerificationResult result=null;
  while (spawned != null) {
    currentIteration++;
    LOGGER.info("String_Node_Str" + threadId.currentId() + "String_Node_Str"+ currentIteration+ "String_Node_Str"+ spawned.size()+ "String_Node_Str"+ spawned.getSecondaryTrajectories().size()+ "String_Node_Str");
    SimulatedDataBlock<TrajectoryWithNeighborhood> simulated=simulator.simulate(simulationConfiguration,spawned);
    SimulatedDataBlock simulatedSecondary=null;
    if (spawned.getSecondaryTrajectories().size() > 0) {
      simulatedSecondary=simulator.simulate(simulationConfiguration,spawned.getSecondaryTrajectories());
    }
    VerifiedDataBlock<TrajectoryWithNeighborhood> verified=verifier.verify(simulated,property);
    if (result == null) {
      result=new VerifiedDataBlockResultAdapter(verified);
    }
 else {
      result=result.merge(new VerifiedDataBlockResultAdapter(verified));
    }
    if (iterationLimit != 0 && currentIteration == iterationLimit) {
      if (simulatedSecondary != null) {
        VerifiedDataBlock<Trajectory> verifiedSecondary=verifier.verify(simulatedSecondary,property);
        result=result.merge(new VerifiedDataBlockResultAdapter(verifiedSecondary));
      }
      LOGGER.warn("String_Node_Str" + threadId.currentId() + "String_Node_Str"+ iterationLimit+ "String_Node_Str");
      break;
    }
 else {
      DistanceCheckedDataBlock distanceChecked=distanceChecker.check(spawned.getConfiguration(),verified);
      if (simulatedSecondary != null) {
        VerifiedDataBlock<Trajectory> verifiedSecondary=verifier.verify(simulatedSecondary,property);
        result=result.merge(new VerifiedDataBlockResultAdapter(verifiedSecondary));
      }
      spawned=emit(spawner.spawn(spawned.getConfiguration(),distanceChecked));
    }
  }
  return result;
}