--- old/src/hotspot/share/runtime/unhandledOops.cpp	2019-07-17 11:42:54.605311119 -0400
+++ new/src/hotspot/share/runtime/unhandledOops.cpp	2019-07-17 11:42:54.385311126 -0400
@@ -55,15 +55,15 @@
 
 // For debugging unhandled oop detector _in the debugger_
 // You don't want to turn it on in compiled code here.
-static bool unhandled_oop_print=0;
+static Thread* unhandled_oop_print = NULL;
 
 void UnhandledOops::register_unhandled_oop(oop* op, address pc) {
   if (!_thread->is_in_stack((address)op))
     return;
 
-  _level ++;
-  if (unhandled_oop_print) {
-    for (int i=0; i<_level; i++) tty->print(" ");
+  _level++;
+  if (unhandled_oop_print == _thread) {
+    for (int i=0; i < _level; i++) tty->print(" ");
     tty->print_cr("r " INTPTR_FORMAT, p2i(op));
   }
   UnhandledOopEntry entry(op, pc);
@@ -98,11 +98,11 @@
 void UnhandledOops::unregister_unhandled_oop(oop* op) {
   if (!_thread->is_in_stack((address)op)) return;
 
-  _level --;
-  if (unhandled_oop_print) {
-    for (int i=0; i<_level; i++) tty->print(" ");
+  if (unhandled_oop_print == _thread) {
+    for (int i=0; i < _level; i++) tty->print(" ");
     tty->print_cr("u " INTPTR_FORMAT, p2i(op));
   }
+  _level--;
 
   int i = _oop_list->find_from_end(op, match_oop_entry);
   assert(i!=-1, "oop not in unhandled_oop_list");