--- old/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Wed Jan 27 11:57:45 2016
+++ new/src/share/vm/gc_implementation/g1/g1CollectedHeap.cpp	Wed Jan 27 11:57:43 2016
@@ -3839,6 +3839,16 @@
   _surviving_young_words = NULL;
 }
 
+class VerifyRegionRemSetClosure : public HeapRegionClosure {
+  public:
+    bool doHeapRegion(HeapRegion* hr) {
+      if (!hr->continuesHumongous()) {
+        hr->verify_rem_set();
+      }
+      return false;
+    }
+};
+
 #ifdef ASSERT
 class VerifyCSetClosure: public HeapRegionClosure {
 public:
@@ -4015,6 +4025,14 @@
       increment_total_collections(false /* full gc */);
       increment_gc_time_stamp();
 
+      if (VerifyRememberedSets) {
+        if (PrintGCDetails) {
+          gclog_or_tty->print_cr("[Verifying RemSets before GC]");
+        }
+        VerifyRegionRemSetClosure v_cl;
+        heap_region_iterate(&v_cl);
+      }
+
       verify_before_gc();
       check_bitmaps("GC Start");
 
@@ -4246,6 +4264,14 @@
         // scanning cards (see CR 7039627).
         increment_gc_time_stamp();
 
+        if (VerifyRememberedSets) {
+          if (PrintGCDetails) {
+            gclog_or_tty->print_cr("[Verifying RemSets after GC]");
+          }
+          VerifyRegionRemSetClosure v_cl;
+          heap_region_iterate(&v_cl);
+        }
+
         verify_after_gc();
         check_bitmaps("GC End");