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