--- old/src/share/vm/utilities/workgroup.cpp	2014-11-06 12:39:46.308986000 -0800
+++ new/src/share/vm/utilities/workgroup.cpp	2014-11-06 12:39:45.688930000 -0800
@@ -46,7 +46,8 @@
   // Other initialization.
   _monitor = new Monitor(/* priority */       Mutex::leaf,
                          /* name */           "WorkGroup monitor",
-                         /* allow_vm_block */ are_GC_task_threads);
+                         /* allow_vm_block */ are_GC_task_threads,
+                                              Monitor::_safepoint_check_sometimes);
   assert(monitor() != NULL, "Failed to allocate monitor");
   _terminate = false;
   _task = NULL;
@@ -378,12 +379,13 @@
 // *** WorkGangBarrierSync
 
 WorkGangBarrierSync::WorkGangBarrierSync()
-  : _monitor(Mutex::safepoint, "work gang barrier sync", true),
+  : _monitor(Mutex::safepoint, "work gang barrier sync", true,
+             Monitor::_safepoint_check_never),
     _n_workers(0), _n_completed(0), _should_reset(false), _aborted(false) {
 }
 
 WorkGangBarrierSync::WorkGangBarrierSync(uint n_workers, const char* name)
-  : _monitor(Mutex::safepoint, name, true),
+  : _monitor(Mutex::safepoint, name, true, Monitor::_safepoint_check_never),
     _n_workers(n_workers), _n_completed(0), _should_reset(false), _aborted(false) {
 }