src/hotspot/share/c1/c1_GraphBuilder.cpp

*** 2234,10 ***
--- 2234,11 ---
  
  
  void GraphBuilder::monitorenter(Value x, int bci) {
    // save state before locking in case of deoptimization after a NullPointerException
    ValueStack* state_before = copy_state_for_exception_with_bci(bci);
+   compilation()->push_monitor();
    append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
    kill_all();
  }