--- old/test/hotspot/jtreg/gc/shenandoah/options/TestThreadCounts.java	2020-06-17 13:38:28.192065933 +0200
+++ new/test/hotspot/jtreg/gc/shenandoah/options/TestThreadCounts.java	2020-06-17 13:38:27.916058454 +0200
@@ -45,7 +45,9 @@
     }
 
     private static void testWith(int conc, int par) throws Exception {
-        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UnlockDiagnosticVMOptions",
+        ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+                "-Xmx128m",
+                "-XX:+UnlockDiagnosticVMOptions",
                 "-XX:+UnlockExperimentalVMOptions",
                 "-XX:+UseShenandoahGC",
                 "-XX:ConcGCThreads=" + conc,