Program: 172883
Project: 172883
Buggy source:
@Override public boolean progress(){
  boolean needsFurtherProgress=false;
  lock.lock();
  if (progressAttempts > 2) {
    for (    Map.Entry<Integer,List<Object>> e : destinationMessages.entrySet()) {
      if (e.getValue().size() > 0) {
        swapToReady(e.getKey(),e.getValue());
      }
    }
    progressAttempts=0;
  }
  try {
    if (finish && readyToSend.isEmpty() && finishedDestinations.size() != destinations.size()) {
      for (      int dest : destinations) {
        if (!finishedDestinations.contains(dest)) {
          if (operation.sendPartial(source,new byte[1],MessageFlags.EMPTY,dest)) {
            finishedDestinations.add(dest);
            progressAttempts=0;
          }
 else {
            needsFurtherProgress=true;
            break;
          }
        }
      }
      return needsFurtherProgress;
    }
    Iterator<Map.Entry<Integer,List<Object>>> it=readyToSend.entrySet().iterator();
    while (it.hasNext()) {
      Map.Entry<Integer,List<Object>> e=it.next();
      List<Object> send=new ArrayList<>(e.getValue());
      if (operation.sendPartial(source,send,0,e.getKey())) {
        e.getValue().clear();
        it.remove();
        counts++;
        progressAttempts=0;
      }
 else {
        needsFurtherProgress=true;
      }
    }
    for (    Map.Entry<Integer,List<Object>> e : destinationMessages.entrySet()) {
      if (e.getValue().size() > 0) {
        needsFurtherProgress=true;
      }
    }
    for (    Map.Entry<Integer,List<Object>> e : readyToSend.entrySet()) {
      if (e.getValue().size() > 0) {
        needsFurtherProgress=true;
      }
    }
  }
  finally {
    lock.unlock();
  }
  progressAttempts++;
  return needsFurtherProgress;
}

Fixed version (ground truth):
@Override public boolean progress(){
  boolean needsFurtherProgress=false;
  lock.lock();
  if (progressAttempts > 2) {
    for (    Map.Entry<Integer,List<Object>> e : destinationMessages.entrySet()) {
      if (e.getValue().size() > 0) {
        swapToReady(e.getKey(),e.getValue());
      }
    }
    progressAttempts=0;
  }
  try {
    if (onFinishedSources.equals(thisWorkerSources) && readyToSend.isEmpty() && finishedDestinations.size() != destinations.size()) {
      for (      int source : thisWorkerSources) {
        Set<Integer> finishedDestPerSource=finishedDestinations.get(source);
        for (        int dest : destinations) {
          if (!finishedDestPerSource.contains(dest)) {
            if (operation.sendPartial(source,new byte[1],MessageFlags.EMPTY,dest)) {
              finishedDestPerSource.add(dest);
              progressAttempts=0;
            }
 else {
              needsFurtherProgress=true;
              break;
            }
          }
        }
      }
      return needsFurtherProgress;
    }
    Iterator<Map.Entry<Integer,List<Object>>> it=readyToSend.entrySet().iterator();
    while (it.hasNext()) {
      Map.Entry<Integer,List<Object>> e=it.next();
      List<Object> send=new ArrayList<>(e.getValue());
      if (operation.sendPartial(representSource,send,0,e.getKey())) {
        e.getValue().clear();
        it.remove();
        counts++;
        progressAttempts=0;
      }
 else {
        needsFurtherProgress=true;
      }
    }
    for (    Map.Entry<Integer,List<Object>> e : destinationMessages.entrySet()) {
      if (e.getValue().size() > 0) {
        needsFurtherProgress=true;
      }
    }
    for (    Map.Entry<Integer,List<Object>> e : readyToSend.entrySet()) {
      if (e.getValue().size() > 0) {
        needsFurtherProgress=true;
      }
    }
  }
  finally {
    lock.unlock();
  }
  progressAttempts++;
  return needsFurtherProgress;
}