Program: 43009
Project: 43009
Buggy source:
private static void populate(List<Object> list){
  populateAllMaps(list);
  populateAllCollections(list);
  list.add(Collections.emptySet());
  list.add(Collections.emptyList());
  list.add(Collections.emptyMap());
  list.add(Collections.singleton(Integer.valueOf(1234)));
  list.add(Collections.singletonList(Integer.valueOf(1234)));
  list.add(Collections.singletonMap(Integer.valueOf(1234),Long.valueOf(54321L)));
  list.add(Boolean.TRUE);
  list.add(Boolean.FALSE);
  list.add(null);
  list.add(Short.valueOf((short)153));
  list.add(Byte.valueOf((byte)18));
  list.add(Character.valueOf('X'));
  list.add(Float.valueOf(0.12f));
  list.add(Double.valueOf(0.12));
  list.add("String_Node_Str");
  list.add(new TestComplexObject(true,(byte)5,'c',(short)8192,294902,319203219042L,21.125f,42.625,"String_Node_Str",new HashSet<Object>(Arrays.asList("String_Node_Str",Boolean.TRUE,Integer.valueOf(12345)))));
  list.add(new TestComplexExternalizableObject(true,(byte)5,'c',(short)8192,294902,319203219042L,21.125f,42.625,"String_Node_Str",new HashSet<Object>(Arrays.asList("String_Node_Str",Boolean.TRUE,Integer.valueOf(12345)))));
  list.add(Collections.unmodifiableMap(new HashMap<Object,Object>()));
  list.add(Collections.unmodifiableSet(new HashSet<Object>()));
  list.add(Collections.unmodifiableCollection(new HashSet<Object>()));
  list.add(Collections.unmodifiableList(new ArrayList<Object>()));
  list.add(Collections.unmodifiableSortedMap(new TreeMap<Object,Object>()));
  list.add(Collections.unmodifiableSortedSet(new TreeSet<Object>()));
  list.add(EnumSet.noneOf(Thread.State.class));
  list.add(EnumSet.allOf(Thread.State.class));
  list.add(new EnumMap<TimeUnit,String>(TimeUnit.class));
  list.add(new TimeoutException());
}

Fixed version (ground truth):
private static void populate(List<Object> list){
  populateAllMaps(list);
  populateAllCollections(list);
  list.add(Collections.emptySet());
  list.add(Collections.emptyList());
  list.add(Collections.emptyMap());
  list.add(Collections.singleton(Integer.valueOf(1234)));
  list.add(Collections.singletonList(Integer.valueOf(1234)));
  list.add(Collections.singletonMap(Integer.valueOf(1234),Long.valueOf(54321L)));
  list.add(Boolean.TRUE);
  list.add(Boolean.FALSE);
  list.add(null);
  list.add(Short.valueOf((short)153));
  list.add(Byte.valueOf((byte)18));
  list.add(Character.valueOf('X'));
  list.add(Float.valueOf(0.12f));
  list.add(Double.valueOf(0.12));
  list.add("String_Node_Str");
  list.add(new TestComplexObject(true,(byte)5,'c',(short)8192,294902,319203219042L,21.125f,42.625,"String_Node_Str",new HashSet<Object>(Arrays.asList("String_Node_Str",Boolean.TRUE,Integer.valueOf(12345)))));
  list.add(new TestComplexExternalizableObject(true,(byte)5,'c',(short)8192,294902,319203219042L,21.125f,42.625,"String_Node_Str",new HashSet<Object>(Arrays.asList("String_Node_Str",Boolean.TRUE,Integer.valueOf(12345)))));
  list.add(Collections.unmodifiableMap(new HashMap<Object,Object>()));
  list.add(Collections.unmodifiableSet(new HashSet<Object>()));
  list.add(Collections.unmodifiableCollection(new HashSet<Object>()));
  list.add(Collections.unmodifiableList(new ArrayList<Object>()));
  list.add(Collections.unmodifiableSortedMap(new TreeMap<Object,Object>()));
  list.add(Collections.unmodifiableSortedSet(new TreeSet<Object>()));
  list.add(EnumSet.noneOf(Thread.State.class));
  list.add(EnumSet.allOf(Thread.State.class));
  list.add(new EnumMap<TimeUnit,String>(TimeUnit.class));
  list.add(new TimeoutException());
  list.add(new TestArrayList());
  list.add(new TestCollectionHolder());
}