diff -r 36d1d483d5d6 -r da91efe96a93 src/share/vm/runtime/synchronizer.cpp
--- a/src/share/vm/runtime/synchronizer.cpp	Fri Aug 31 16:39:35 2012 -0700
+++ b/src/share/vm/runtime/synchronizer.cpp	Sat Sep 01 13:25:18 2012 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -77,11 +77,11 @@
 // Only bother with this argument setup if dtrace is available
 // TODO-FIXME: probes should not fire when caller is _blocked.  assert() accordingly.
 
-#define DTRACE_MONITOR_PROBE_COMMON(klassOop, thread)                      \
+#define DTRACE_MONITOR_PROBE_COMMON(obj, thread)                           \
   char* bytes = NULL;                                                      \
   int len = 0;                                                             \
   jlong jtid = SharedRuntime::get_java_tid(thread);                        \
-  Symbol* klassname = ((oop)(klassOop))->klass()->klass_part()->name();  \
+  Symbol* klassname = ((oop)(obj))->klass()->name();                       \
   if (klassname != NULL) {                                                 \
     bytes = (char*)klassname->bytes();                                     \
     len = klassname->utf8_length();                                        \
@@ -93,19 +93,19 @@
 HS_DTRACE_PROBE_DECL4(hotspot, monitor__waited,
   jlong, uintptr_t, char*, int);
 
-#define DTRACE_MONITOR_WAIT_PROBE(monitor, klassOop, thread, millis)       \
+#define DTRACE_MONITOR_WAIT_PROBE(monitor, obj, thread, millis)            \
   {                                                                        \
     if (DTraceMonitorProbes) {                                            \
-      DTRACE_MONITOR_PROBE_COMMON(klassOop, thread);                       \
+      DTRACE_MONITOR_PROBE_COMMON(obj, thread);                            \
       HS_DTRACE_PROBE5(hotspot, monitor__wait, jtid,                       \
                        (monitor), bytes, len, (millis));                   \
     }                                                                      \
   }
 
-#define DTRACE_MONITOR_PROBE(probe, monitor, klassOop, thread)             \
+#define DTRACE_MONITOR_PROBE(probe, monitor, obj, thread)                  \
   {                                                                        \
     if (DTraceMonitorProbes) {                                            \
-      DTRACE_MONITOR_PROBE_COMMON(klassOop, thread);                       \
+      DTRACE_MONITOR_PROBE_COMMON(obj, thread);                            \
       HS_DTRACE_PROBE4(hotspot, monitor__##probe, jtid,                    \
                        (uintptr_t)(monitor), bytes, len);                  \
     }                                                                      \
@@ -113,10 +113,10 @@
 
 #else /* USDT2 */
 
-#define DTRACE_MONITOR_WAIT_PROBE(monitor, klassOop, thread, millis)       \
+#define DTRACE_MONITOR_WAIT_PROBE(monitor, obj, thread, millis)            \
   {                                                                        \
     if (DTraceMonitorProbes) {                                            \
-      DTRACE_MONITOR_PROBE_COMMON(klassOop, thread);                       \
+      DTRACE_MONITOR_PROBE_COMMON(obj, thread);                            \
       HOTSPOT_MONITOR_WAIT(jtid,                                           \
                            (uintptr_t)(monitor), bytes, len, (millis));  \
     }                                                                      \
@@ -124,10 +124,10 @@
 
 #define HOTSPOT_MONITOR_PROBE_waited HOTSPOT_MONITOR_PROBE_WAITED
 
-#define DTRACE_MONITOR_PROBE(probe, monitor, klassOop, thread)             \
+#define DTRACE_MONITOR_PROBE(probe, monitor, obj, thread)                  \
   {                                                                        \
     if (DTraceMonitorProbes) {                                            \
-      DTRACE_MONITOR_PROBE_COMMON(klassOop, thread);                       \
+      DTRACE_MONITOR_PROBE_COMMON(obj, thread);                            \
       HOTSPOT_MONITOR_PROBE_##probe(jtid, /* probe = waited */             \
                        (uintptr_t)(monitor), bytes, len);                  \
     }                                                                      \
@@ -136,8 +136,8 @@
 #endif /* USDT2 */
 #else //  ndef DTRACE_ENABLED
 
-#define DTRACE_MONITOR_WAIT_PROBE(klassOop, thread, millis, mon)    {;}
-#define DTRACE_MONITOR_PROBE(probe, klassOop, thread, mon)          {;}
+#define DTRACE_MONITOR_WAIT_PROBE(obj, thread, millis, mon)    {;}
+#define DTRACE_MONITOR_PROBE(probe, obj, thread, mon)          {;}
 
 #endif // ndef DTRACE_ENABLED