| /* |
| * Copyright (c) 2016, 2020, 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 TestEvilSyncBug |
| * @summary Tests for crash/assert when attaching init thread during shutdown |
| * @key gc |
| * @requires vm.gc.Shenandoah & !vm.graal.enabled |
| * @library /test/lib |
| * @modules java.base/jdk.internal.misc |
| * java.management |
| * @run driver/timeout=480 TestEvilSyncBug |
| */ |
| |
| import java.util.*; |
| import java.util.concurrent.*; |
| import java.util.concurrent.locks.*; |
| |
| import jdk.test.lib.process.ProcessTools; |
| import jdk.test.lib.process.OutputAnalyzer; |
| |
| public class TestEvilSyncBug { |
| |
| private static final int NUM_RUNS = 100; |
| |
| static Thread[] hooks = new MyHook[10000]; |
| |
| public static void main(String[] args) throws Exception { |
| if (args.length > 0) { |
| test(); |
| } else { |
| // Use 1/4 of available processors to avoid over-saturation. |
| int numJobs = Math.max(1, Runtime.getRuntime().availableProcessors() / 4); |
| ExecutorService pool = Executors.newFixedThreadPool(numJobs); |
| Future<?>[] fs = new Future<?>[NUM_RUNS]; |
| |
| for (int c = 0; c < NUM_RUNS; c++) { |
| Callable<Void> task = () -> { |
| ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-Xms128m", |
| "-Xmx128m", |
| "-XX:+UnlockExperimentalVMOptions", |
| "-XX:+UnlockDiagnosticVMOptions", |
| "-XX:+UseShenandoahGC", |
| "-XX:ShenandoahGCHeuristics=aggressive", |
| "TestEvilSyncBug", "test"); |
| OutputAnalyzer output = new OutputAnalyzer(pb.start()); |
| output.shouldHaveExitValue(0); |
| return null; |
| }; |
| fs[c] = pool.submit(task); |
| } |
| |
| for (Future<?> f : fs) { |
| f.get(); |
| } |
| |
| pool.shutdown(); |
| pool.awaitTermination(1, TimeUnit.HOURS); |
| } |
| } |
| |
| private static void test() throws Exception { |
| |
| for (int t = 0; t < hooks.length; t++) { |
| hooks[t] = new MyHook(); |
| } |
| |
| ExecutorService service = Executors.newFixedThreadPool( |
| 2, |
| r -> { |
| Thread t = new Thread(r); |
| t.setDaemon(true); |
| return t; |
| } |
| ); |
| |
| List<Future<?>> futures = new ArrayList<>(); |
| for (int c = 0; c < 100; c++) { |
| Runtime.getRuntime().addShutdownHook(hooks[c]); |
| final Test[] tests = new Test[1000]; |
| for (int t = 0; t < tests.length; t++) { |
| tests[t] = new Test(); |
| } |
| |
| Future<?> f1 = service.submit(() -> { |
| Runtime.getRuntime().addShutdownHook(new MyHook()); |
| IntResult2 r = new IntResult2(); |
| for (Test test : tests) { |
| test.RL_Us(r); |
| } |
| }); |
| Future<?> f2 = service.submit(() -> { |
| Runtime.getRuntime().addShutdownHook(new MyHook()); |
| for (Test test : tests) { |
| test.WLI_Us(); |
| } |
| }); |
| |
| futures.add(f1); |
| futures.add(f2); |
| } |
| |
| for (Future<?> f : futures) { |
| f.get(); |
| } |
| } |
| |
| public static class IntResult2 { |
| int r1, r2; |
| } |
| |
| public static class Test { |
| final StampedLock lock = new StampedLock(); |
| |
| int x, y; |
| |
| public void RL_Us(IntResult2 r) { |
| StampedLock lock = this.lock; |
| long stamp = lock.readLock(); |
| r.r1 = x; |
| r.r2 = y; |
| lock.unlock(stamp); |
| } |
| |
| public void WLI_Us() { |
| try { |
| StampedLock lock = this.lock; |
| long stamp = lock.writeLockInterruptibly(); |
| x = 1; |
| y = 2; |
| lock.unlock(stamp); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| |
| private static class MyHook extends Thread { |
| @Override |
| public void run() { |
| try { |
| Thread.sleep(10); |
| } catch (Exception e) {} |
| } |
| } |
| |
| } |