--- old/src/hotspot/share/prims/whitebox.cpp	2018-09-10 16:10:29.831698698 -0400
+++ new/src/hotspot/share/prims/whitebox.cpp	2018-09-10 16:10:29.603698708 -0400
@@ -1504,7 +1504,7 @@
 
   oop class_loader_oop = JNIHandles::resolve(class_loader);
   ClassLoaderData* cld = class_loader_oop != NULL
-      ? java_lang_ClassLoader::loader_data(class_loader_oop)
+      ? java_lang_ClassLoader::loader_data_acquire(class_loader_oop)
       : ClassLoaderData::the_null_class_loader_data();
 
   void* metadata = MetadataFactory::new_array<u1>(cld, WhiteBox::array_bytes_to_length((size_t)size), thread);
@@ -1515,7 +1515,7 @@
 WB_ENTRY(void, WB_FreeMetaspace(JNIEnv* env, jobject wb, jobject class_loader, jlong addr, jlong size))
   oop class_loader_oop = JNIHandles::resolve(class_loader);
   ClassLoaderData* cld = class_loader_oop != NULL
-      ? java_lang_ClassLoader::loader_data(class_loader_oop)
+      ? java_lang_ClassLoader::loader_data_acquire(class_loader_oop)
       : ClassLoaderData::the_null_class_loader_data();
 
   MetadataFactory::free_array(cld, (Array<u1>*)(uintptr_t)addr);