--- old/src/hotspot/share/gc/serial/defNewGeneration.inline.hpp	2020-08-25 10:54:36.331769818 +0200
+++ new/src/hotspot/share/gc/serial/defNewGeneration.inline.hpp	2020-08-25 10:54:35.787760652 +0200
@@ -90,11 +90,10 @@
 
 template <typename OopClosureType>
 void DefNewGeneration::oop_since_save_marks_iterate(OopClosureType* cl) {
-  cl->set_generation(this);
   eden()->oop_since_save_marks_iterate(cl);
   to()->oop_since_save_marks_iterate(cl);
   from()->oop_since_save_marks_iterate(cl);
-  cl->reset_generation();
+
   save_marks();
 }