--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/security/SecureRandom/ThreadSafe.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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.
+ */
+
+import java.security.Provider;
+import java.security.SecureRandom;
+import java.security.SecureRandomSpi;
+import java.util.Map;
+
+/*
+ * @test
+ * @bug 7004967
+ * @summary SecureRandom should be more explicit about threading
+ */
+public class ThreadSafe {
+    public static void main(String[] args) throws Exception {
+        Provider p = new P();
+        NoSync.test(SecureRandom.getInstance("S1", p), 5, 5);
+        try {
+            NoSync.test(SecureRandom.getInstance("S2", p), 5, 5);
+            throw new Exception("Failed");
+        } catch (RuntimeException re) {
+            // Good
+        }
+        NoSync.test(SecureRandom.getInstance("S3", p), 5, 5);
+        try {
+            NoSync.test(SecureRandom.getInstance("S4", p), 5, 5);
+            throw new Exception("Failed");
+        } catch (RuntimeException re) {
+            // Good
+        }
+    }
+
+    public static class P extends Provider {
+        public P() {
+
+            super("P", 1.0d, "Haha");
+
+            // Good. No attribute.
+            put("SecureRandom.S1", S.class.getName());
+
+            // Bad. Boasting ThreadSafe but isn't
+            put("SecureRandom.S2", S.class.getName());
+            put("SecureRandom.S2 ThreadSafe", "true");
+
+            // Good. No attribute.
+            putService(new Service(this, "SecureRandom", "S3",
+                    S.class.getName(), null, null));
+
+            // Bad. Boasting ThreadSafe but isn't
+            putService(new Service(this, "SecureRandom", "S4",
+                    S.class.getName(), null, Map.of("ThreadSafe", "true")));
+        }
+    }
+
+    // This implementation is not itself thread safe.
+    public static class S extends SecureRandomSpi {
+        @java.lang.Override
+        protected void engineSetSeed(byte[] seed) {
+            return;
+        }
+
+        private volatile boolean inCall = false;
+        @Override
+        protected void engineNextBytes(byte[] bytes) {
+            if (inCall) {
+                throw new RuntimeException("IN CALL");
+            }
+            inCall = true;
+            try {
+                Thread.sleep(100);
+            } catch (Exception e) {
+                // OK
+            }
+            inCall = false;
+        }
+
+        @Override
+        protected byte[] engineGenerateSeed(int numBytes) {
+            return new byte[numBytes];
+        }
+    }
+}