diff -r db65921e9a9b -r bd6b78feb6a3 src/hotspot/share/runtime/mutexLocker.cpp
--- a/src/hotspot/share/runtime/mutexLocker.cpp	Thu Jun 07 06:27:09 2018 -0400
+++ b/src/hotspot/share/runtime/mutexLocker.cpp	Thu Jun 07 14:11:56 2018 +0200
@@ -48,6 +48,8 @@
 Mutex*   JNIGlobalActive_lock         = NULL;
 Mutex*   JNIWeakAlloc_lock            = NULL;
 Mutex*   JNIWeakActive_lock           = NULL;
+Mutex*   StringTableWeakAlloc_lock    = NULL;
+Mutex*   StringTableWeakActive_lock   = NULL;
 Mutex*   JNIHandleBlockFreeList_lock  = NULL;
 Mutex*   VMWeakAlloc_lock             = NULL;
 Mutex*   VMWeakActive_lock            = NULL;
@@ -186,6 +188,9 @@
   def(VMWeakAlloc_lock             , PaddedMutex  , vmweak,      true,  Monitor::_safepoint_check_never);
   def(VMWeakActive_lock            , PaddedMutex  , vmweak-1,    true,  Monitor::_safepoint_check_never);
 
+  def(StringTableWeakAlloc_lock    , PaddedMutex  , vmweak,      true,  Monitor::_safepoint_check_never);
+  def(StringTableWeakActive_lock   , PaddedMutex  , vmweak-1,    true,  Monitor::_safepoint_check_never);
+
   if (UseConcMarkSweepGC || UseG1GC) {
     def(FullGCCount_lock           , PaddedMonitor, leaf,        true,  Monitor::_safepoint_check_never);      // in support of ExplicitGCInvokesConcurrent
   }