--- old/test/hotspot/jtreg/serviceability/dcmd/gc/RunGCTest.java	2018-06-06 00:36:27.673656732 +0200
+++ new/test/hotspot/jtreg/serviceability/dcmd/gc/RunGCTest.java	2018-06-06 00:36:27.416645665 +0200
@@ -36,6 +36,7 @@
 /*
  * @test
  * @summary Test of diagnostic command GC.run
+ * @requires vm.gc != "Z"
  * @library /test/lib
  * @modules java.base/jdk.internal.misc
  *          java.compiler