--- a/src/hotspot/share/jfr/leakprofiler/chains/bitset.hpp	Fri Aug 23 18:47:55 2019 +0200
+++ b/src/hotspot/share/jfr/leakprofiler/chains/bitset.hpp	Sat Aug 24 14:30:27 2019 +0200
@@ -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;
   }