--- old/src/hotspot/share/gc/shared/threadLocalAllocBuffer.inline.hpp	2019-07-26 14:17:28.116299948 +0200
+++ new/src/hotspot/share/gc/shared/threadLocalAllocBuffer.inline.hpp	2019-07-26 14:17:27.884292333 +0200
@@ -42,7 +42,7 @@
     // ensure that the returned space is not considered parsable by
     // any concurrent GC thread.
     size_t hdr_size = oopDesc::header_size();
-    Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal);
+    //Copy::fill_to_words(obj + hdr_size, size - hdr_size, badHeapWordVal);
 #endif // ASSERT
     // This addition is safe because we know that top is
     // at least size below end, so the add can't wrap.