--- old/src/hotspot/share/gc/g1/heapRegion.inline.hpp	2018-03-27 15:51:18.969708394 +0200
+++ new/src/hotspot/share/gc/g1/heapRegion.inline.hpp	2018-03-27 15:51:18.710700406 +0200
@@ -247,6 +247,7 @@
 
 inline void HeapRegion::note_end_of_marking() {
   _prev_top_at_mark_start = _next_top_at_mark_start;
+  _next_top_at_mark_start = bottom();
   _prev_marked_bytes = _next_marked_bytes;
   _next_marked_bytes = 0;
 }