--- old/src/hotspot/share/runtime/memprofiler.cpp	Tue Nov 21 15:20:34 2017
+++ new/src/hotspot/share/runtime/memprofiler.cpp	Tue Nov 21 15:20:34 2017
@@ -52,8 +52,6 @@
 
 
 void MemProfilerTask::task() {
-  // Get thread lock to provide mutual exclusion, and so we can iterate safely over the thread list.
-  MutexLocker mu(Threads_lock);
   MemProfiler::do_trace();
 }