Program: 90201
Project: 90201
Buggy source:
protected static RoaringBitmap lazyorfromlazyinputs(final RoaringBitmap x1,final RoaringBitmap x2){
  final RoaringBitmap answer=new RoaringBitmap();
  int pos1=0, pos2=0;
  final int length1=x1.highLowContainer.size(), length2=x2.highLowContainer.size();
  main:   if (pos1 < length1 && pos2 < length2) {
    short s1=x1.highLowContainer.getKeyAtIndex(pos1);
    short s2=x2.highLowContainer.getKeyAtIndex(pos2);
    while (true) {
      if (s1 == s2) {
        Container c1=x1.highLowContainer.getContainerAtIndex(pos1);
        Container c2=x2.highLowContainer.getContainerAtIndex(pos2);
        if ((c2 instanceof BitmapContainer) && (!(c1 instanceof BitmapContainer))) {
          Container tmp=c1;
          c1=c2;
          c2=tmp;
        }
        answer.highLowContainer.append(s1,c1.lazyIOR(c2));
        pos1++;
        pos2++;
        if ((pos1 == length1) || (pos2 == length2)) {
          break main;
        }
        s1=x1.highLowContainer.getKeyAtIndex(pos1);
        s2=x2.highLowContainer.getKeyAtIndex(pos2);
      }
 else       if (Util.compareUnsigned(s1,s2) < 0) {
        Container c1=x1.highLowContainer.getContainerAtIndex(pos1);
        answer.highLowContainer.append(s1,c1);
        pos1++;
        if (pos1 == length1) {
          break main;
        }
        s1=x1.highLowContainer.getKeyAtIndex(pos1);
      }
 else {
        Container c2=x1.highLowContainer.getContainerAtIndex(pos2);
        answer.highLowContainer.append(s2,c2);
        pos2++;
        if (pos2 == length2) {
          break main;
        }
        s2=x2.highLowContainer.getKeyAtIndex(pos2);
      }
    }
  }
  if (pos1 == length1) {
    answer.highLowContainer.append(x2.highLowContainer,pos2,length2);
  }
 else   if (pos2 == length2) {
    answer.highLowContainer.append(x1.highLowContainer,pos1,length1);
  }
  return answer;
}

Fixed version (ground truth):
protected static RoaringBitmap lazyorfromlazyinputs(final RoaringBitmap x1,final RoaringBitmap x2){
  final RoaringBitmap answer=new RoaringBitmap();
  int pos1=0, pos2=0;
  final int length1=x1.highLowContainer.size(), length2=x2.highLowContainer.size();
  main:   if (pos1 < length1 && pos2 < length2) {
    short s1=x1.highLowContainer.getKeyAtIndex(pos1);
    short s2=x2.highLowContainer.getKeyAtIndex(pos2);
    while (true) {
      if (s1 == s2) {
        Container c1=x1.highLowContainer.getContainerAtIndex(pos1);
        Container c2=x2.highLowContainer.getContainerAtIndex(pos2);
        if ((c2 instanceof BitmapContainer) && (!(c1 instanceof BitmapContainer))) {
          Container tmp=c1;
          c1=c2;
          c2=tmp;
        }
        answer.highLowContainer.append(s1,c1.lazyIOR(c2));
        pos1++;
        pos2++;
        if ((pos1 == length1) || (pos2 == length2)) {
          break main;
        }
        s1=x1.highLowContainer.getKeyAtIndex(pos1);
        s2=x2.highLowContainer.getKeyAtIndex(pos2);
      }
 else       if (Util.compareUnsigned(s1,s2) < 0) {
        Container c1=x1.highLowContainer.getContainerAtIndex(pos1);
        answer.highLowContainer.append(s1,c1);
        pos1++;
        if (pos1 == length1) {
          break main;
        }
        s1=x1.highLowContainer.getKeyAtIndex(pos1);
      }
 else {
        Container c2=x2.highLowContainer.getContainerAtIndex(pos2);
        answer.highLowContainer.append(s2,c2);
        pos2++;
        if (pos2 == length2) {
          break main;
        }
        s2=x2.highLowContainer.getKeyAtIndex(pos2);
      }
    }
  }
  if (pos1 == length1) {
    answer.highLowContainer.append(x2.highLowContainer,pos2,length2);
  }
 else   if (pos2 == length2) {
    answer.highLowContainer.append(x1.highLowContainer,pos1,length1);
  }
  return answer;
}