--- old/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp	2014-12-10 11:28:16.948361000 -0500
+++ new/src/share/vm/gc_implementation/g1/heapRegionRemSet.cpp	2014-12-10 11:28:12.908514000 -0500
@@ -840,7 +840,7 @@
 HeapRegionRemSet::HeapRegionRemSet(G1BlockOffsetSharedArray* bosa,
                                    HeapRegion* hr)
   : _bosa(bosa),
-    _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true),
+    _m(Mutex::leaf, FormatBuffer<128>("HeapRegionRemSet lock #%u", hr->hrm_index()), true, Monitor::_safepoint_check_never),
     _code_roots(), _other_regions(hr, &_m), _iter_state(Unclaimed), _iter_claimed(0) {
   reset_for_par_iteration();
 }