Mercurial > hg > graal-compiler
view agent/test/jdi/serialvm.java @ 364:919e7959392a
6742641: G1: NullPointerException during GCOld
Summary: An update buffer is not processed correctly, which causes roots into the collection set not to be scanned and, hence, for the heap to be corrupted. The cause is that an object is accessed after it has been explicitly deleted, which causes a race.
Reviewed-by: jcoomes, ysr
author | tonyp |
---|---|
date | Mon, 22 Sep 2008 09:56:49 -0400 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ import com.sun.jdi.*; import com.sun.jdi.connect.*; import java.util.Map; import java.util.List; import java.util.Iterator; import java.io.IOException; /* This class is used to test multi VM connectivity feature of * SA/JDI. Accepts two PIDs as arguments. Connects to first VM *, disposes it, connects to second VM, disposes second VM. */ public class serialvm { static AttachingConnector myPIDConn; static VirtualMachine vm1; static VirtualMachine vm2; static VirtualMachineManager vmmgr; public static void println(String msg) { System.out.println(msg); } private static void usage() { System.err.println("Usage: java serialvm <pid1> <pid2>"); System.exit(1); } public static void main(String args[]) { vmmgr = Bootstrap.virtualMachineManager(); List attachingConnectors = vmmgr.attachingConnectors(); if (attachingConnectors.isEmpty()) { System.err.println( "ERROR: No attaching connectors"); return; } Iterator myIt = attachingConnectors.iterator(); while (myIt.hasNext()) { AttachingConnector tmpCon = (AttachingConnector)myIt.next(); if (tmpCon.name().equals( "sun.jvm.hotspot.jdi.SAPIDAttachingConnector")) { myPIDConn = tmpCon; break; } } int pid1 = 0, pid2 = 0; String pidText = null; switch (args.length) { case (2): try { pidText = args[0]; pid1 = Integer.parseInt(pidText); System.out.println( "pid1: " + pid1); pidText = args[1]; pid2 = Integer.parseInt(pidText); System.out.println( "pid2: " + pid2); } catch (NumberFormatException e) { println(e.getMessage()); usage(); } break; default: usage(); } // attach, dispose, attach2, dispose2 pattern // as opposed to attach1, attach2, dispose1, dispose2 vm1 = attachPID(pid1); if (vm1 != null) { System.out.println("vm1: attached ok!"); System.out.println(vm1.version()); sagdoit mine = new sagdoit(vm1); mine.doAll(); } if (vm1 != null) { vm1.dispose(); } vm2 = attachPID(pid2); if (vm2 != null) { System.out.println("vm2: attached ok!"); System.out.println(vm2.version()); sagdoit mine = new sagdoit(vm2); mine.doAll(); } if (vm2 != null) { vm2.dispose(); } } private static VirtualMachine attachPID(int pid) { Map connArgs = myPIDConn.defaultArguments(); System.out.println("connArgs = " + connArgs); VirtualMachine vm; Connector.StringArgument connArg = (Connector.StringArgument)connArgs.get("pid"); connArg.setValue(Integer.toString(pid)); try { vm = myPIDConn.attach(connArgs); } catch (IOException ee) { System.err.println("ERROR: myPIDConn.attach got IO Exception:" + ee); vm = null; } catch (IllegalConnectorArgumentsException ee) { System.err.println("ERROR: myPIDConn.attach got illegal args exception:" + ee); vm = null; } return vm; } }