1/*
2 * Copyright (c) 1998, 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/* @test
25 * @bug 4118056
26 * @key intermittent
27 *
28 * @summary synopsis: Distributed Garbage Collection Deadlock
29 * @author Laird Dornin
30 *
31 * @library ../../testlibrary
32 * @modules java.rmi/sun.rmi.registry
33 *          java.rmi/sun.rmi.server
34 *          java.rmi/sun.rmi.transport
35 *          java.rmi/sun.rmi.transport.tcp
36 * @build TestLibrary Test TestImpl RegistryVM RegistryRunner
37 * @run main/othervm/policy=security.policy/timeout=360 DGCDeadLock
38 */
39
40/* This test attempts to cause a deadlock between the rmi leaseChecker
41 * thread and a thread that is servicing a dgc clean call. Before the
42 * fix for this bug was implemented, deadlock could occur when the
43 * leaseChecker held the lock on the lease table and the clean thread
44 * held the lock on a target x. The clean thread would attempt to get
45 * the lock on the leaseTable to do DGCImpl.unregisterTarget and the
46 * leaseChecker would attempt to get the lock on x to do
47 * Target.vmidDead.  Each thread held a resource that the other thread
48 * was attempting to lock.
49 *
50 * This test causes the above conditions to occur and waits to see if
51 * a given set of remote calls finishes "quickly enough."
52 */
53
54import java.rmi.*;
55import java.io.*;
56
57public class DGCDeadLock implements Runnable {
58    final static public int HOLD_TARGET_TIME = 25000;
59    public static final double TEST_FAIL_TIME =
60            (HOLD_TARGET_TIME + 30000) * TestLibrary.getTimeoutFactor();
61    public static volatile boolean finished = false;
62    static final DGCDeadLock test = new DGCDeadLock();
63    static volatile int registryPort = -1;
64
65    static {
66        System.setProperty("sun.rmi.transport.cleanInterval", "50");
67    }
68
69    static public void main(String[] args) {
70
71        RegistryVM testImplVM = null;
72
73        System.err.println("\nregression test for 4118056\n");
74        TestLibrary.suggestSecurityManager("java.rmi.RMISecurityManager");
75
76        try {
77            String options = " --add-opens java.rmi/sun.rmi.transport=ALL-UNNAMED" +
78                " -Djava.rmi.dgc.leaseValue=500000" +
79                " -Dsun.rmi.dgc.checkInterval=" +
80                (HOLD_TARGET_TIME - 5000);
81
82            testImplVM = RegistryVM.createRegistryVMWithRunner("TestImpl", options);
83            testImplVM.start();
84            registryPort = testImplVM.getPort();
85
86            synchronized (test) {
87                Thread t = new Thread(test);
88                t.setDaemon(true);
89                t.start();
90
91                // wait for the remote calls to take place
92                test.wait((long)TEST_FAIL_TIME);
93            }
94
95            if (!finished) {
96                TestLibrary.bomb("Test failed, had exception or exercise" +
97                                           " routines took too long to " +
98                                           "execute");
99            }
100            System.err.println("Test passed, exercises " +
101                               "finished in time.");
102
103        } catch (Exception e) {
104            TestLibrary.bomb("test failed in main()", e);
105        } finally {
106            if (testImplVM != null) {
107                testImplVM.cleanup();
108                testImplVM = null;
109            }
110        }
111    }
112
113    public void run() {
114        try {
115            String echo = null;
116
117            // create a test client
118            Test foo = (Test) Naming.lookup("rmi://:" +
119                                            registryPort +
120                                            "/Foo");
121            echo = foo.echo("Hello world");
122            System.err.println("Test object created.");
123
124            /* give TestImpl time to lock the target in the
125             * object table and any dirtys finish.
126             */
127            Thread.currentThread().sleep(5000);
128
129            //unreference "Foo"
130            foo = null;
131
132            //garbage collect and finalize foo
133            Runtime.getRuntime().gc();
134            Runtime.getRuntime().runFinalization();
135
136            //import "Bar"
137            Test bar = (Test) Naming.lookup("rmi://:" +
138                                            registryPort +
139                                            "/Bar");
140
141            /* infinite loop to show the liveness of Client,
142             * if we have deadlock remote call will not return
143             */
144            try {
145                for (int i = 0; i < 500; i++) {
146                    echo = bar.echo("Remote call" + i);
147                    Thread.sleep(10);
148                }
149
150                // flag exercises finished
151                finished = true;
152
153            } catch (RemoteException e) {
154                System.err.println("catch RemoteException");
155                e.printStackTrace();
156            }
157
158        } catch (Exception e) {
159            TestLibrary.bomb("test failed in run()", e);
160        } finally {
161            synchronized(this) {
162                notify();
163            }
164        }
165    }
166}
167