*** old/src/share/vm/memory/sharedHeap.cpp	Thu Dec  4 16:47:26 2014
--- new/src/share/vm/memory/sharedHeap.cpp	Thu Dec  4 16:47:25 2014

*** 152,162 ****
--- 152,162 ----
    if (_active) {
      _sh->unregister_strong_roots_scope(this);
    }
  }
  
! Monitor* SharedHeap::StrongRootsScope::_lock = new Monitor(Mutex::leaf, "StrongRootsScope lock", false, Monitor::_safepoint_check_never);
  
  void SharedHeap::StrongRootsScope::mark_worker_done_with_threads(uint n_workers) {
    // The Thread work barrier is only needed by G1 Class Unloading.
    // No need to use the barrier if this is single-threaded code.
    if (UseG1GC && ClassUnloadingWithConcurrentMark && n_workers > 0) {