--- a/src/hotspot/share/gc/z/zInitialize.cpp	Mon Oct 28 11:26:00 2019 +0100
+++ b/src/hotspot/share/gc/z/zInitialize.cpp	Mon Oct 28 11:26:53 2019 +0100
@@ -50,4 +50,6 @@
   ZTracer::initialize();
   ZLargePages::initialize();
   ZBarrierSet::set_barrier_set(barrier_set);
+
+  initialize_os();
 }