diff -r 7e82752d3fdf -r 4ea1ac63535e hotspot/src/share/vm/runtime/thread.cpp
--- a/hotspot/src/share/vm/runtime/thread.cpp	Fri Jun 04 17:44:51 2010 -0400
+++ b/hotspot/src/share/vm/runtime/thread.cpp	Wed Jun 09 13:53:58 2010 -0400
@@ -2799,6 +2799,7 @@
   _task  = NULL;
   _queue = queue;
   _counters = counters;
+  _buffer_blob = NULL;
 
 #ifndef PRODUCT
   _ideal_graph_printer = NULL;