diff -r 48d3d0eb193b -r 583211d4b16b src/share/vm/runtime/vmStructs.cpp
--- a/src/share/vm/runtime/vmStructs.cpp	Wed Jun 26 16:06:38 2013 +0200
+++ b/src/share/vm/runtime/vmStructs.cpp	Wed Jul 03 11:50:29 2013 -0700
@@ -382,7 +382,7 @@
   nonstatic_field(ConstMethod,          _size_of_parameters,                           u2)                                    \
   nonstatic_field(ObjArrayKlass,               _element_klass,                                Klass*)                                \
   nonstatic_field(ObjArrayKlass,               _bottom_klass,                                 Klass*)                                \
-  volatile_nonstatic_field(Symbol,             _refcount,                                     int)                                   \
+  volatile_nonstatic_field(Symbol,             _refcount,                                     short)                                 \
   nonstatic_field(Symbol,                      _identity_hash,                                int)                                   \
   nonstatic_field(Symbol,                      _length,                                       unsigned short)                        \
   unchecked_nonstatic_field(Symbol,            _body,                                         sizeof(jbyte)) /* NOTE: no type */     \