diff -r a8dcacf95bff -r 1126f0607c70 src/hotspot/share/runtime/handshake.cpp
--- a/src/hotspot/share/runtime/handshake.cpp	Thu Apr 25 05:54:54 2019 -0700
+++ b/src/hotspot/share/runtime/handshake.cpp	Thu Apr 25 10:56:31 2019 -0400
@@ -137,7 +137,7 @@
       // There is an assumption in the code that the Threads_lock should be
       // locked during certain phases.
       {
-        MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
+        MutexLocker ml(Threads_lock, Mutex::_no_safepoint_check_flag);
         _target->handshake_process_by_vmthread();
       }
     } while (!poll_for_completed_thread());
@@ -186,7 +186,7 @@
           // There is an assumption in the code that the Threads_lock should
           // be locked during certain phases.
           jtiwh.rewind();
-          MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag);
+          MutexLocker ml(Threads_lock, Mutex::_no_safepoint_check_flag);
           for (JavaThread *thr = jtiwh.next(); thr != NULL; thr = jtiwh.next()) {
             // A new thread on the ThreadsList will not have an operation,
             // hence it is skipped in handshake_process_by_vmthread.