--- old/src/share/vm/runtime/thread.cpp	2017-04-04 15:20:36.604066133 -0700
+++ new/src/share/vm/runtime/thread.cpp	2017-04-04 15:20:36.472066680 -0700
@@ -1480,6 +1480,7 @@
   _do_not_unlock_if_synchronized = false;
   _cached_monitor_info = NULL;
   _parker = Parker::Allocate(this);
+  _bytes_until_sample = 0;
 
 #ifndef PRODUCT
   _jmp_ring_index = 0;