Mercurial > hg > truffle
diff test/serviceability/attach/AttachWithStalePidFile.java @ 11139:2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
Summary: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
Reviewed-by: dcubed, dholmes, sspitsyn, mgerdin, ctornqvi, dsamersoff
author | allwin |
---|---|
date | Fri, 12 Jul 2013 18:43:27 +0200 |
parents | |
children | 09f19d3de485 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/serviceability/attach/AttachWithStalePidFile.java Fri Jul 12 18:43:27 2013 +0200 @@ -0,0 +1,139 @@ +/* + * Copyright (c) 2013, 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 7162400 + * @key regression + * @summary Regression test for attach issue where stale pid files in /tmp lead to connection issues + * @library /testlibrary + * @compile AttachWithStalePidFileTarget.java + * @run main AttachWithStalePidFile + */ + +import com.oracle.java.testlibrary.*; +import com.sun.tools.attach.VirtualMachine; +import sun.tools.attach.HotSpotVirtualMachine; +import java.lang.reflect.Field; +import java.nio.file.*; +import java.nio.file.attribute.*; +import java.io.*; + +public class AttachWithStalePidFile { + public static void main(String... args) throws Exception { + + // this test is only valid on non-Windows platforms + if(Platform.isWindows()) { + System.out.println("This test is only valid on non-Windows platforms."); + return; + } + + // Since there might be stale pid-files owned by different + // users on the system we may need to retry the test in case we + // are unable to remove the existing file. + int retries = 5; + while(!runTest() && --retries > 0); + + if(retries == 0) { + throw new RuntimeException("Test failed after 5 retries. " + + "Remove any /tmp/.java_pid* files and retry."); + } + } + + public static boolean runTest() throws Exception { + ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( + "-XX:+UnlockDiagnosticVMOptions", "-XX:+PauseAtStartup", "AttachWithStalePidFileTarget"); + Process target = pb.start(); + Path pidFile = null; + + try { + int pid = getUnixProcessId(target); + + // create the stale .java_pid file. use hard-coded /tmp path as in th VM + pidFile = createJavaPidFile(pid); + if(pidFile == null) { + return false; + } + + // wait for vm.paused file to be created and delete it once we find it. + waitForAndResumeVM(pid); + + // unfortunately there's no reliable way to know the VM is ready to receive the + // attach request so we have to do an arbitrary sleep. + Thread.sleep(5000); + + HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString()); + BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader(vm.remoteDataDump())); + String line = null; + while((line = remoteDataReader.readLine()) != null); + + vm.detach(); + return true; + } + finally { + target.destroy(); + target.waitFor(); + + if(pidFile != null && Files.exists(pidFile)) { + Files.delete(pidFile); + } + } + } + + private static Path createJavaPidFile(int pid) throws Exception { + Path pidFile = Paths.get("/tmp/.java_pid" + pid); + if(Files.exists(pidFile)) { + try { + Files.delete(pidFile); + } + catch(FileSystemException e) { + if(e.getReason().equals("Operation not permitted")) { + System.out.println("Unable to remove exisiting stale PID file" + pidFile); + return null; + } + throw e; + } + } + return Files.createFile(pidFile, + PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("rw-------"))); + } + + private static void waitForAndResumeVM(int pid) throws Exception { + Path pauseFile = Paths.get("vm.paused." + pid); + int retries = 60; + while(!Files.exists(pauseFile) && --retries > 0) { + Thread.sleep(1000); + } + if(retries == 0) { + throw new RuntimeException("Timeout waiting for VM to start. " + + "vm.paused file not created within 60 seconds."); + } + Files.delete(pauseFile); + } + + private static int getUnixProcessId(Process unixProcess) throws Exception { + Field pidField = unixProcess.getClass().getDeclaredField("pid"); + pidField.setAccessible(true); + return (Integer)pidField.get(unixProcess); + } +}