1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test ArraysNewInstanceBug 26 * @bug 8182397 27 * @summary race in setting array_klass field for component mirror with mirror update for klass 28 * @modules java.base/jdk.internal.misc 29 * @run main/othervm -Xcomp ArraysNewInstanceBug 30 */ 31 32 // This test crashes in compiled code with race, because the compiler generates code that assumes this ordering. 33 import java.lang.reflect.Array; 34 import java.net.URL; 35 import java.net.URLClassLoader; 36 37 public class ArraysNewInstanceBug implements Runnable { 38 static Class<?>[] classes; 39 40 int start; 41 42 ArraysNewInstanceBug(int start) { 43 this.start = start; 44 } 45 46 String[] result; 47 48 public void run() { 49 result = new String[classes.length]; 50 System.err.print('.'); 51 for (int i = start; i < classes.length; i++) { 52 result[i] = Array.newInstance(classes[i], 0).getClass().getName(); 53 } 54 } 55 56 public static void main(String[] args) throws Throwable { 57 Class<?> c = ArraysNewInstanceBug.class; 58 ClassLoader apploader = c.getClassLoader(); 59 for (int iter = 0; iter < 10 ; iter++) { // 10 is enough to get it to crash on my machine. 60 System.err.print('['); 61 classes = new Class<?>[1000]; 62 String urlpath = "file://" + System.getProperty("test.classes") + "/"; 63 for (int i = 0; i < classes.length; i++) { 64 ClassLoader loader = new URLClassLoader(new URL[] { new URL(urlpath) }, apploader.getParent()); 65 classes[i] = loader.loadClass(c.getSimpleName()); 66 } 67 System.err.print(']'); 68 System.err.print('('); 69 int threadCount = 64; 70 Thread[] threads = new Thread[threadCount]; 71 for (int i = 0; i < threads.length; i++) { 72 threads[i] = new Thread(new ArraysNewInstanceBug(i)); 73 } 74 for (int i = 0; i < threads.length; i++) { 75 threads[i].start(); 76 } 77 for (int i = 0; i < threads.length; i++) { 78 threads[i].join(); 79 } 80 System.err.print(')'); 81 } 82 } 83 }