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/*
* Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* 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
* @bug 4118056
* @key intermittent
*
* @summary synopsis: Distributed Garbage Collection Deadlock
* @author Laird Dornin
*
* @library ../../testlibrary
* @modules java.rmi/sun.rmi.registry
* java.rmi/sun.rmi.server
* java.rmi/sun.rmi.transport
* java.rmi/sun.rmi.transport.tcp
* @build TestLibrary Test TestImpl RegistryVM RegistryRunner
* @run main/othervm/policy=security.policy/timeout=360 DGCDeadLock
*/
/* This test attempts to cause a deadlock between the rmi leaseChecker
* thread and a thread that is servicing a dgc clean call. Before the
* fix for this bug was implemented, deadlock could occur when the
* leaseChecker held the lock on the lease table and the clean thread
* held the lock on a target x. The clean thread would attempt to get
* the lock on the leaseTable to do DGCImpl.unregisterTarget and the
* leaseChecker would attempt to get the lock on x to do
* Target.vmidDead. Each thread held a resource that the other thread
* was attempting to lock.
*
* This test causes the above conditions to occur and waits to see if
* a given set of remote calls finishes "quickly enough."
*/
import java.rmi.*;
import java.io.*;
public class DGCDeadLock implements Runnable {
final static public int HOLD_TARGET_TIME = 25000;
public static final double TEST_FAIL_TIME =
(HOLD_TARGET_TIME + 30000) * TestLibrary.getTimeoutFactor();
public static volatile boolean finished = false;
static final DGCDeadLock test = new DGCDeadLock();
static volatile int registryPort = -1;
static {
System.setProperty("sun.rmi.transport.cleanInterval", "50");
}
static public void main(String[] args) {
RegistryVM testImplVM = null;
System.err.println("\nregression test for 4118056\n");
TestLibrary.suggestSecurityManager("java.rmi.RMISecurityManager");
try {
String options = " --add-opens java.rmi/sun.rmi.transport=ALL-UNNAMED" +
" -Djava.rmi.dgc.leaseValue=500000" +
" -Dsun.rmi.dgc.checkInterval=" +
(HOLD_TARGET_TIME - 5000);
testImplVM = RegistryVM.createRegistryVMWithRunner("TestImpl", options);
testImplVM.start();
registryPort = testImplVM.getPort();
synchronized (test) {
Thread t = new Thread(test);
t.setDaemon(true);
t.start();
// wait for the remote calls to take place
test.wait((long)TEST_FAIL_TIME);
}
if (!finished) {
TestLibrary.bomb("Test failed, had exception or exercise" +
" routines took too long to " +
"execute");
}
System.err.println("Test passed, exercises " +
"finished in time.");
} catch (Exception e) {
TestLibrary.bomb("test failed in main()", e);
} finally {
if (testImplVM != null) {
testImplVM.cleanup();
testImplVM = null;
}
}
}
public void run() {
try {
String echo = null;
// create a test client
Test foo = (Test) Naming.lookup("rmi://:" +
registryPort +
"/Foo");
echo = foo.echo("Hello world");
System.err.println("Test object created.");
/* give TestImpl time to lock the target in the
* object table and any dirtys finish.
*/
Thread.currentThread().sleep(5000);
//unreference "Foo"
foo = null;
//garbage collect and finalize foo
Runtime.getRuntime().gc();
Runtime.getRuntime().runFinalization();
//import "Bar"
Test bar = (Test) Naming.lookup("rmi://:" +
registryPort +
"/Bar");
/* infinite loop to show the liveness of Client,
* if we have deadlock remote call will not return
*/
try {
for (int i = 0; i < 500; i++) {
echo = bar.echo("Remote call" + i);
Thread.sleep(10);
}
// flag exercises finished
finished = true;
} catch (RemoteException e) {
System.err.println("catch RemoteException");
e.printStackTrace();
}
} catch (Exception e) {
TestLibrary.bomb("test failed in run()", e);
} finally {
synchronized(this) {
notify();
}
}
}
}
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