diff -r c092a2fbb7c3 -r f01f81fa1242 src/hotspot/share/classfile/javaClasses.cpp
--- a/src/hotspot/share/classfile/javaClasses.cpp	Sun Jan 28 19:49:06 2018 -0500
+++ b/src/hotspot/share/classfile/javaClasses.cpp	Mon Jan 29 11:55:40 2018 -0500
@@ -1702,7 +1702,7 @@
       method = mhandle();
     }
 
-    _methods->short_at_put(_index, method->orig_method_idnum());
+    _methods->ushort_at_put(_index, method->orig_method_idnum());
     _bcis->int_at_put(_index, Backtrace::merge_bci_and_version(bci, method->constants()->version()));
 
     // Note:this doesn't leak symbols because the mirror in the backtrace keeps the
@@ -1756,7 +1756,7 @@
 
   BacktraceElement next(Thread* thread) {
     BacktraceElement e (Handle(thread, _mirrors->obj_at(_index)),
-                        _methods->short_at(_index),
+                        _methods->ushort_at(_index),
                         Backtrace::version_at(_bcis->int_at(_index)),
                         Backtrace::bci_at(_bcis->int_at(_index)),
                         _names->symbol_at(_index));