A DESCRIPTION OF THE PROBLEM :
Nested calls to computeIfAbsent result in ConcurrentModificationException

REGRESSION : Last worked in version 8u172


---------- BEGIN SOURCE ----------
  public static void main(String[] args) {
        // dep2 depends on dep1
        Map<String, String> cache = new HashMap<>();
        cache.computeIfAbsent("dep2", ignored -> {
            cache.computeIfAbsent("dep1", ignored2 -> "dep1_value");
            return "dep2_value";
        });
        System.out.println(cache.get("dep1"));
        System.out.println(cache.get("dep2"));
    }
---------- END SOURCE ----------

FREQUENCY : always