src/hotspot/share/runtime/thread.cpp

*** 1597,1606 ****
--- 1597,1611 ----
  
    if (SafepointMechanism::uses_thread_local_poll()) {
      SafepointMechanism::initialize_header(this);
    }
  
+ #ifdef _WIN64
+   _windows_saved_rsi = NULL;
+   _windows_saved_rdi = NULL;
+ #endif // _WIN64
+ 
    pd_initialize();
  }
  
  JavaThread::JavaThread(bool is_attaching_via_jni) :
                         Thread() {