--- old/test/hotspot/jtreg/gc/shenandoah/options/TestModeUnlock.java	2020-06-17 13:38:27.536048156 +0200
+++ new/test/hotspot/jtreg/gc/shenandoah/options/TestModeUnlock.java	2020-06-17 13:38:27.260040677 +0200
@@ -52,6 +52,7 @@
     private static void testWith(String h, Mode mode) throws Exception {
         {
             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+                    "-Xmx128m",
                     "-XX:-UnlockDiagnosticVMOptions",
                     "-XX:-UnlockExperimentalVMOptions",
                     "-XX:+UseShenandoahGC",
@@ -72,6 +73,7 @@
 
         {
             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+                    "-Xmx128m",
                     "-XX:+UnlockDiagnosticVMOptions",
                     "-XX:-UnlockExperimentalVMOptions",
                     "-XX:+UseShenandoahGC",
@@ -92,6 +94,7 @@
 
         {
             ProcessBuilder pb = ProcessTools.createJavaProcessBuilder(
+                    "-Xmx128m",
                     "-XX:-UnlockDiagnosticVMOptions",
                     "-XX:+UnlockExperimentalVMOptions",
                     "-XX:+UseShenandoahGC",