src/hotspot/share/gc/serial/tenuredGeneration.cpp

@@ -389,11 +389,11 @@
  
    return res;
  }
  
  oop TenuredGeneration::allocate_for_promotion(oop obj, size_t obj_size) {
-   assert(obj_size == obj->size(), "bad obj_size passed in");
+   assert(obj_size == obj->size() || UseCompactObjectHeaders, "bad obj_size passed in");
  
  #ifndef PRODUCT
    if (SerialHeap::heap()->promotion_should_fail()) {
      return nullptr;
    }