382 lines
14 KiB
Java
382 lines
14 KiB
Java
/*
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* Copyright (c) 2013, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.security.CodeSource;
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import java.security.Permission;
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import java.security.PermissionCollection;
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import java.security.Permissions;
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import java.security.Policy;
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import java.security.ProtectionDomain;
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import java.util.Enumeration;
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import java.util.concurrent.Semaphore;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.concurrent.atomic.AtomicInteger;
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import java.util.logging.LogManager;
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import java.util.logging.Logger;
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import jdk.internal.access.JavaAWTAccess;
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import jdk.internal.access.SharedSecrets;
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/**
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* @test
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* @bug 8065991
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* @summary check that when LogManager is initialized, a deadlock similar
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* to that described in 8065709 will not occur.
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* @modules java.base/jdk.internal.access
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* java.logging
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* java.management
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* @run main/othervm LogManagerAppContextDeadlock UNSECURE
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* @run main/othervm LogManagerAppContextDeadlock SECURE
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*
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* @author danielfuchs
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*/
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public class LogManagerAppContextDeadlock {
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public static final Semaphore sem = new Semaphore(0);
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public static final Semaphore sem2 = new Semaphore(0);
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public static final Semaphore sem3 = new Semaphore(-2);
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public static volatile boolean goOn = true;
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public static volatile Exception thrown;
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// Emulate EventQueue
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static class FakeEventQueue {
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static final Logger logger = Logger.getLogger("foo");
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}
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// Emulate AppContext
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static class FakeAppContext {
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static final AtomicInteger numAppContexts = new AtomicInteger(0);
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static final class FakeAppContextLock {}
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static final FakeAppContextLock lock = new FakeAppContextLock();
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static volatile FakeAppContext appContext;
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final FakeEventQueue queue;
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FakeAppContext() {
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appContext = this;
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numAppContexts.incrementAndGet();
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// release sem2 to let Thread t2 call Logger.getLogger().
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sem2.release();
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try {
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// Wait until we JavaAWTAccess is called by LogManager.
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// Thread 2 will call Logger.getLogger() which will
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// trigger a call to JavaAWTAccess - which will release
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// sem, thus ensuring that Thread #2 is where we want it.
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sem.acquire();
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System.out.println("Sem acquired: Thread #2 has called JavaAWTAccess");
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} catch(InterruptedException x) {
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Thread.interrupted();
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}
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queue = new FakeEventQueue();
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}
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static FakeAppContext getAppContext() {
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synchronized (lock) {
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if (numAppContexts.get() == 0) {
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return new FakeAppContext();
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}
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return appContext;
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}
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}
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static {
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SharedSecrets.setJavaAWTAccess(new JavaAWTAccess() {
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@Override
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public Object getAppletContext() {
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if (numAppContexts.get() == 0) return null;
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// We are in JavaAWTAccess, we can release sem and let
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// FakeAppContext constructor proceeed.
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System.out.println("Releasing Sem");
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sem.release();
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return getAppContext();
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}
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});
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}
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}
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// Test with or without a security manager
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public static enum TestCase {
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UNSECURE, SECURE;
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public void run() throws Exception {
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System.out.println("Running test case: " + name());
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Configure.setUp(this);
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test(this);
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}
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}
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public static void test(TestCase test) throws Exception {
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Thread t1 = new Thread() {
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@Override
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public void run() {
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sem3.release();
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System.out.println("FakeAppContext.getAppContext()");
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FakeAppContext.getAppContext();
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System.out.println("Done: FakeAppContext.getAppContext()");
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}
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};
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t1.setDaemon(true);
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t1.start();
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Thread t2 = new Thread() {
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public Object logger;
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public void run() {
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sem3.release();
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try {
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// Wait until Thread1 is in FakeAppContext constructor
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sem2.acquire();
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System.out.println("Sem2 acquired: Thread #1 will be waiting to acquire Sem");
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} catch (InterruptedException ie) {
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Thread.interrupted();
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}
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System.out.println("Logger.getLogger(name).info(name)");
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// stick the logger in an instance variable to prevent it
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// from being garbage collected before the main thread
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// calls LogManager.getLogger() below.
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logger = Logger.getLogger(test.name());//.info(name);
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System.out.println("Done: Logger.getLogger(name).info(name)");
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}
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};
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t2.setDaemon(true);
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t2.start();
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System.out.println("Should exit now...");
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Thread detector = new DeadlockDetector();
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detector.start();
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// Wait for the 3 threads to start
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sem3.acquire();
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// Now wait for t1 & t2 to finish, or for a deadlock to be detected.
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while (goOn && (t1.isAlive() || t2.isAlive())) {
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if (t2.isAlive()) t2.join(1000);
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if (test == TestCase.UNSECURE && System.getSecurityManager() == null) {
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// if there's no security manager, AppContext.getAppContext() is
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// not called - so Thread t2 will not end up calling
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// sem.release(). In that case we must release the semaphore here
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// so that t1 can proceed.
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if (LogManager.getLogManager().getLogger(TestCase.UNSECURE.name()) != null) {
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// means Thread t2 has created the logger
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sem.release();
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}
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}
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if (t1.isAlive()) t1.join(1000);
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}
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if (thrown != null) {
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throw thrown;
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}
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}
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// Thrown by the deadlock detector
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static final class DeadlockException extends RuntimeException {
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public DeadlockException(String message) {
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super(message);
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}
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@Override
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public void printStackTrace() {
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}
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}
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public static void main(String[] args) throws Exception {
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if (args.length == 0) {
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args = new String[] { "SECURE" };
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}
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// If we don't initialize LogManager here, there will be
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// a deadlock.
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// See <https://bugs.openjdk.org/browse/JDK-8065709?focusedCommentId=13582038&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13582038>
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// for more details.
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Logger.getLogger("main").info("starting...");
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try {
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TestCase.valueOf(args[0]).run();
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System.out.println("Test "+args[0]+" Passed");
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} catch(Throwable t) {
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System.err.println("Test " + args[0] +" failed: " + t);
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t.printStackTrace();
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}
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}
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// Called by the deadlock detector when a deadlock is found.
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static void fail(Exception x) {
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x.printStackTrace();
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if (thrown == null) {
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thrown = x;
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}
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goOn = false;
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}
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// A thread that detect deadlocks.
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static final class DeadlockDetector extends Thread {
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public DeadlockDetector() {
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this.setDaemon(true);
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}
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@Override
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public void run() {
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sem3.release();
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Configure.doPrivileged(this::loop);
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}
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public void loop() {
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while(goOn) {
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try {
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long[] ids = ManagementFactory.getThreadMXBean().findDeadlockedThreads();
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ids = ids == null ? new long[0] : ids;
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if (ids.length == 1) {
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throw new RuntimeException("Found 1 deadlocked thread: "+ids[0]);
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} else if (ids.length > 0) {
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ThreadInfo[] infos = ManagementFactory.getThreadMXBean().getThreadInfo(ids, Integer.MAX_VALUE);
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System.err.println("Found "+ids.length+" deadlocked threads: ");
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for (ThreadInfo inf : infos) {
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System.err.println(inf);
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}
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throw new DeadlockException("Found "+ids.length+" deadlocked threads");
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}
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Thread.sleep(100);
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} catch(InterruptedException | RuntimeException x) {
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fail(x);
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}
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}
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}
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}
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// A helper class to configure the security manager for the test,
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// and bypass it when needed.
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static class Configure {
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static Policy policy = null;
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static final ThreadLocal<AtomicBoolean> allowAll = new ThreadLocal<AtomicBoolean>() {
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@Override
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protected AtomicBoolean initialValue() {
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return new AtomicBoolean(false);
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}
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};
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static void setUp(TestCase test) {
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switch (test) {
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case SECURE:
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if (policy == null && System.getSecurityManager() != null) {
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throw new IllegalStateException("SecurityManager already set");
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} else if (policy == null) {
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policy = new SimplePolicy(TestCase.SECURE, allowAll);
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Policy.setPolicy(policy);
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System.setSecurityManager(new SecurityManager());
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}
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if (System.getSecurityManager() == null) {
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throw new IllegalStateException("No SecurityManager.");
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}
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if (policy == null) {
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throw new IllegalStateException("policy not configured");
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}
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break;
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case UNSECURE:
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if (System.getSecurityManager() != null) {
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throw new IllegalStateException("SecurityManager already set");
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}
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break;
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default:
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new InternalError("No such testcase: " + test);
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}
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}
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static void doPrivileged(Runnable run) {
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allowAll.get().set(true);
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try {
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run.run();
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} finally {
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allowAll.get().set(false);
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}
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}
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}
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// A Helper class to build a set of permissions.
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static final class PermissionsBuilder {
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final Permissions perms;
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public PermissionsBuilder() {
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this(new Permissions());
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}
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public PermissionsBuilder(Permissions perms) {
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this.perms = perms;
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}
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public PermissionsBuilder add(Permission p) {
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perms.add(p);
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return this;
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}
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public PermissionsBuilder addAll(PermissionCollection col) {
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if (col != null) {
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for (Enumeration<Permission> e = col.elements(); e.hasMoreElements(); ) {
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perms.add(e.nextElement());
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}
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}
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return this;
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}
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public Permissions toPermissions() {
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final PermissionsBuilder builder = new PermissionsBuilder();
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builder.addAll(perms);
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return builder.perms;
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}
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}
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// Policy for the test...
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public static class SimplePolicy extends Policy {
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static final Policy DEFAULT_POLICY = Policy.getPolicy();
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final Permissions permissions;
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final Permissions allPermissions;
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final ThreadLocal<AtomicBoolean> allowAll; // actually: this should be in a thread locale
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public SimplePolicy(TestCase test, ThreadLocal<AtomicBoolean> allowAll) {
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this.allowAll = allowAll;
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// we don't actually need any permission to create our
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// FileHandlers because we're passing invalid parameters
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// which will make the creation fail...
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permissions = new Permissions();
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permissions.add(new RuntimePermission("accessClassInPackage.jdk.internal.access"));
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// these are used for configuring the test itself...
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allPermissions = new Permissions();
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allPermissions.add(new java.security.AllPermission());
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}
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@Override
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public boolean implies(ProtectionDomain domain, Permission permission) {
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if (allowAll.get().get()) return allPermissions.implies(permission);
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return permissions.implies(permission) || DEFAULT_POLICY.implies(domain, permission);
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}
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@Override
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public PermissionCollection getPermissions(CodeSource codesource) {
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return new PermissionsBuilder().addAll(allowAll.get().get()
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? allPermissions : permissions).toPermissions();
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}
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@Override
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public PermissionCollection getPermissions(ProtectionDomain domain) {
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return new PermissionsBuilder().addAll(allowAll.get().get()
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? allPermissions : permissions).toPermissions();
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}
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}
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}
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