diff -r 1258121876f8 -r 8e875c964f41 src/share/vm/jfr/leakprofiler/chains/bitset.hpp
--- a/src/share/vm/jfr/leakprofiler/chains/bitset.hpp	Fri Sep 27 13:23:32 2019 +0800
+++ b/src/share/vm/jfr/leakprofiler/chains/bitset.hpp	Wed Oct 09 16:11:58 2019 +0800
@@ -47,7 +47,7 @@
 
   BitMap::idx_t mark_obj(const HeapWord* addr) {
     const BitMap::idx_t bit = addr_to_bit(addr);
-    _bits.par_set_bit(bit);
+    _bits.set_bit(bit);
     return bit;
   }