--- a/src/hotspot/share/runtime/vmStructs.cpp	Thu Jun 06 20:19:03 2019 +0200
+++ b/src/hotspot/share/runtime/vmStructs.cpp	Thu Jun 06 15:09:17 2019 -0400
@@ -526,7 +526,7 @@
   nonstatic_field(ClassLoaderData,             _is_unsafe_anonymous,                          bool)                                  \
   volatile_nonstatic_field(ClassLoaderData,    _dictionary,                                   Dictionary*)                           \
                                                                                                                                      \
-     static_field(ClassLoaderDataGraph,        _head,                                         ClassLoaderData*)                      \
+  static_ptr_volatile_field(ClassLoaderDataGraph, _head,                                      ClassLoaderData*)                      \
                                                                                                                                      \
   /**********/                                                                                                                       \
   /* Arrays */                                                                                                                       \