--- old/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2018-04-03 16:36:53.512246425 +0200
+++ new/src/hotspot/share/gc/g1/g1ConcurrentMark.cpp	2018-04-03 16:36:53.256238627 +0200
@@ -1025,9 +1025,6 @@
 
   void distribute_marked_bytes(HeapRegion* hr, size_t marked_words) {
     uint const region_idx = hr->hrm_index();
-    assert(hr->is_starts_humongous(),
-           "Should not have marked bytes " SIZE_FORMAT " in non-starts humongous region %u (%s)",
-           marked_words, region_idx, hr->get_type_str());
     uint num_regions_in_humongous = (uint)G1CollectedHeap::humongous_obj_size_in_regions(marked_words);
 
     for (uint i = region_idx; i < (region_idx + num_regions_in_humongous); i++) {
@@ -1035,6 +1032,8 @@
       size_t const words_to_add = MIN2(HeapRegion::GrainWords, marked_words);
       assert(words_to_add > 0, "Out of space to distribute before end of humongous object in region %u (starts %u)", i, region_idx);
 
+      log_trace(gc, marking)("Adding " SIZE_FORMAT " words to humongous region %u (%s)", 
+                             words_to_add, i, r->get_type_str());
       r->add_to_marked_bytes(words_to_add * HeapWordSize);
       marked_words -= words_to_add;
     }
@@ -1050,15 +1049,12 @@
     // region. We need to distribute this value across the entire set of regions a
     // humongous object spans.
     if (hr->is_humongous()) {
+      assert(hr->is_starts_humongous() || marked_words == 0,
+             "Should not have marked words " SIZE_FORMAT " in non-starts humongous region %u (%s)",
+             marked_words, region_idx, hr->get_type_str());
+
       if (marked_words > 0) {
-        log_trace(gc, marking)("Adding " SIZE_FORMAT " words to humongous start region %u (%s), word size %d (%f)", 
-                               marked_words, region_idx, hr->get_type_str(),
-                               oop(hr->bottom())->size(), (double)oop(hr->bottom())->size() / HeapRegion::GrainWords);
         distribute_marked_bytes(hr, marked_words);
-      } else {
-        assert(marked_words == 0,
-               "Asked to add " SIZE_FORMAT " words to add to continues humongous region %u (%s)",
-               marked_words, region_idx, hr->get_type_str());
       }
     } else {
       log_trace(gc, marking)("Adding " SIZE_FORMAT " words to region %u (%s)", marked_words, region_idx, hr->get_type_str());