--- /dev/null	2020-01-17 11:46:19.065201212 +0100
+++ new/test/hotspot/jtreg/gc/shenandoah/jni/TestPinnedGarbage.java	2020-01-17 17:11:24.298126391 +0100
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+/* @test TestPinnedGarbage
+ * @summary Test that garbage in the pinned region does not crash VM
+ * @key gc
+ * @requires vm.gc.Shenandoah & !vm.graal.enabled
+ *
+ * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m
+ *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
+ *      -XX:+ShenandoahVerify -XX:+ShenandoahDegeneratedGC
+ *      TestPinnedGarbage
+ *
+ * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m
+ *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
+ *      -XX:+ShenandoahVerify -XX:-ShenandoahDegeneratedGC
+ *      TestPinnedGarbage
+ */
+
+/* @test TestPinnedGarbage
+ * @summary Test that garbage in the pinned region does not crash VM
+ * @key gc
+ * @requires vm.gc.Shenandoah & !vm.graal.enabled
+ *
+ * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m
+ *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
+ *      TestPinnedGarbage
+ *
+ * @run main/othervm/native -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -Xmx512m
+ *      -XX:+UseShenandoahGC
+ *      -XX:+ShenandoahVerify
+ *      TestPinnedGarbage
+ */
+
+import java.util.Arrays;
+import java.util.concurrent.*;
+
+public class TestPinnedGarbage {
+    static {
+        System.loadLibrary("TestPinnedGarbage");
+    }
+
+    private static final int NUM_RUNS      = 1_000;
+    private static final int OBJS_COUNT    = 1_000;
+    private static final int GARBAGE_COUNT = 1_000_000;
+
+    private static native void pin(int[] a);
+    private static native void unpin(int[] a);
+
+    public static void main(String[] args) {
+        for (int i = 0; i < NUM_RUNS; i++) {
+            test();
+        }
+    }
+
+    private static void test() {
+        Object[] objs = new Object[OBJS_COUNT];
+        for (int i = 0; i < OBJS_COUNT; i++) {
+            objs[i] = new MyClass();
+        }
+
+        int[] cog = new int[10];
+        int cogIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);
+        objs[cogIdx] = cog;
+        pin(cog);
+
+        for (int i = 0; i < GARBAGE_COUNT; i++) {
+            int rIdx = ThreadLocalRandom.current().nextInt(OBJS_COUNT);
+            if (rIdx != cogIdx) {
+                objs[rIdx] = new MyClass();
+            }
+        }
+
+        unpin(cog);
+    }
+
+    public static class MyClass {
+        public Object ref = new Object();
+    }
+
+}