1 /*
2 * Copyright (c) 1998, 2012, 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 *
27 * @summary synopsis: Distributed Garbage Collection Deadlock
28 * @author Laird Dornin
29 *
30 * @library ../../testlibrary
31 * @build TestLibrary Test TestImpl TestImpl_Stub
32 * @run main/othervm/policy=security.policy/timeout=360 DGCDeadLock
33 */
34
35 /* This test attempts to cause a deadlock between the rmi leaseChecker
36 * thread and a thread that is servicing a dgc clean call. Before the
37 * fix for this bug was implemented, deadlock could occur when the
38 * leaseChecker held the lock on the lease table and the clean thread
39 * held the lock on a target x. The clean thread would attempt to get
40 * the lock on the leaseTable to do DGCImpl.unregisterTarget and the
41 * leaseChecker would attempt to get the lock on x to do
42 * Target.vmidDead. Each thread held a resource that the other thread
43 * was attempting to lock.
44 *
45 * This test causes the above conditions to occur and waits to see if
46 * a given set of remote calls finishes "quickly enough."
47 */
48
49 import java.rmi.*;
50 import java.io.*;
51
52 public class DGCDeadLock implements Runnable {
53 private static final int REGISTRY_PORT = TestLibrary.getUnusedRandomPort();
54 final static public int HOLD_TARGET_TIME = 25000;
55 public static int TEST_FAIL_TIME = HOLD_TARGET_TIME + 30000;
56 public static boolean finished = false;
57 static DGCDeadLock test = new DGCDeadLock();
58
59 static {
60 System.setProperty("sun.rmi.transport.cleanInterval", "50");
61 }
62
63 static public void main(String[] args) {
64
65 JavaVM testImplVM = null;
66
67 System.err.println("\nregression test for 4118056\n");
68 TestLibrary.suggestSecurityManager("java.rmi.RMISecurityManager");
69
70 try {
71 String options = " -Djava.security.policy=" +
72 TestParams.defaultPolicy +
73 " -Djava.rmi.dgc.leaseValue=500000" +
74 " -Dsun.rmi.dgc.checkInterval=" +
75 (HOLD_TARGET_TIME - 5000) +
76 " -Drmi.registry.port=" + REGISTRY_PORT +
77 "" ;
78
79 testImplVM = new JavaVM("TestImpl", options, "");
80 testImplVM.start();
81
82 synchronized (test) {
83 Thread t = new Thread(test);
84 t.setDaemon(true);
85 t.start();
86
87 // wait for the remote calls to take place
88 test.wait(TEST_FAIL_TIME);
89 }
90
91 if (!finished) {
92 TestLibrary.bomb("Test failed, had exception or exercise" +
93 " routines took too long to " +
94 "execute");
95 }
96 System.err.println("Test passed, exercises " +
97 "finished in time.");
98
99 } catch (Exception e) {
100 testImplVM = null;
101 TestLibrary.bomb("test failed", e);
102 }
103 }
104
105 public void run() {
106 try {
107 String echo = null;
108
109 // give the test remote object time to initialize.
110 Thread.currentThread().sleep(8000);
111
112 // create a test client
113 Test foo = (Test) Naming.lookup("rmi://:" +
114 REGISTRY_PORT +
115 "/Foo");
116 echo = foo.echo("Hello world");
117 System.err.println("Test object created.");
118
119 /* give TestImpl time to lock the target in the
120 * object table and any dirtys finish.
121 */
122 Thread.currentThread().sleep(5000);
123
124 //unreference "Foo"
125 foo = null;
126
127 //garbage collect and finalize foo
128 Runtime.getRuntime().gc();
129 Runtime.getRuntime().runFinalization();
130
131 //import "Bar"
132 Test bar = (Test) Naming.lookup("rmi://:" +
133 REGISTRY_PORT +
134 "/Bar");
135
136 /* infinite loop to show the liveness of Client,
137 * if we have deadlock remote call will not return
138 */
139 try {
140 for (int i = 0; i < 500; i++) {
141 echo = bar.echo("Remote call" + i);
142 Thread.sleep(10);
143 }
144
145 // flag exercises finished
146 finished = true;
147
148 } catch (RemoteException e) {
149 }
150
151 } catch (Exception e) {
152 TestLibrary.bomb("test failed", e);
153 } finally {
154 }
155 }
156 }