Mercurial > hg > truffle
comparison 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 |
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date | Fri, 12 Jul 2013 18:43:27 +0200 |
parents | |
children | 09f19d3de485 |
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11136:dbc0b5dc08f5 | 11139:2e8f19c2feef |
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1 /* | |
2 * Copyright (c) 2013, 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 /* | |
25 * @test | |
26 * @bug 7162400 | |
27 * @key regression | |
28 * @summary Regression test for attach issue where stale pid files in /tmp lead to connection issues | |
29 * @library /testlibrary | |
30 * @compile AttachWithStalePidFileTarget.java | |
31 * @run main AttachWithStalePidFile | |
32 */ | |
33 | |
34 import com.oracle.java.testlibrary.*; | |
35 import com.sun.tools.attach.VirtualMachine; | |
36 import sun.tools.attach.HotSpotVirtualMachine; | |
37 import java.lang.reflect.Field; | |
38 import java.nio.file.*; | |
39 import java.nio.file.attribute.*; | |
40 import java.io.*; | |
41 | |
42 public class AttachWithStalePidFile { | |
43 public static void main(String... args) throws Exception { | |
44 | |
45 // this test is only valid on non-Windows platforms | |
46 if(Platform.isWindows()) { | |
47 System.out.println("This test is only valid on non-Windows platforms."); | |
48 return; | |
49 } | |
50 | |
51 // Since there might be stale pid-files owned by different | |
52 // users on the system we may need to retry the test in case we | |
53 // are unable to remove the existing file. | |
54 int retries = 5; | |
55 while(!runTest() && --retries > 0); | |
56 | |
57 if(retries == 0) { | |
58 throw new RuntimeException("Test failed after 5 retries. " + | |
59 "Remove any /tmp/.java_pid* files and retry."); | |
60 } | |
61 } | |
62 | |
63 public static boolean runTest() throws Exception { | |
64 ProcessBuilder pb = ProcessTools.createJavaProcessBuilder( | |
65 "-XX:+UnlockDiagnosticVMOptions", "-XX:+PauseAtStartup", "AttachWithStalePidFileTarget"); | |
66 Process target = pb.start(); | |
67 Path pidFile = null; | |
68 | |
69 try { | |
70 int pid = getUnixProcessId(target); | |
71 | |
72 // create the stale .java_pid file. use hard-coded /tmp path as in th VM | |
73 pidFile = createJavaPidFile(pid); | |
74 if(pidFile == null) { | |
75 return false; | |
76 } | |
77 | |
78 // wait for vm.paused file to be created and delete it once we find it. | |
79 waitForAndResumeVM(pid); | |
80 | |
81 // unfortunately there's no reliable way to know the VM is ready to receive the | |
82 // attach request so we have to do an arbitrary sleep. | |
83 Thread.sleep(5000); | |
84 | |
85 HotSpotVirtualMachine vm = (HotSpotVirtualMachine)VirtualMachine.attach(((Integer)pid).toString()); | |
86 BufferedReader remoteDataReader = new BufferedReader(new InputStreamReader(vm.remoteDataDump())); | |
87 String line = null; | |
88 while((line = remoteDataReader.readLine()) != null); | |
89 | |
90 vm.detach(); | |
91 return true; | |
92 } | |
93 finally { | |
94 target.destroy(); | |
95 target.waitFor(); | |
96 | |
97 if(pidFile != null && Files.exists(pidFile)) { | |
98 Files.delete(pidFile); | |
99 } | |
100 } | |
101 } | |
102 | |
103 private static Path createJavaPidFile(int pid) throws Exception { | |
104 Path pidFile = Paths.get("/tmp/.java_pid" + pid); | |
105 if(Files.exists(pidFile)) { | |
106 try { | |
107 Files.delete(pidFile); | |
108 } | |
109 catch(FileSystemException e) { | |
110 if(e.getReason().equals("Operation not permitted")) { | |
111 System.out.println("Unable to remove exisiting stale PID file" + pidFile); | |
112 return null; | |
113 } | |
114 throw e; | |
115 } | |
116 } | |
117 return Files.createFile(pidFile, | |
118 PosixFilePermissions.asFileAttribute(PosixFilePermissions.fromString("rw-------"))); | |
119 } | |
120 | |
121 private static void waitForAndResumeVM(int pid) throws Exception { | |
122 Path pauseFile = Paths.get("vm.paused." + pid); | |
123 int retries = 60; | |
124 while(!Files.exists(pauseFile) && --retries > 0) { | |
125 Thread.sleep(1000); | |
126 } | |
127 if(retries == 0) { | |
128 throw new RuntimeException("Timeout waiting for VM to start. " + | |
129 "vm.paused file not created within 60 seconds."); | |
130 } | |
131 Files.delete(pauseFile); | |
132 } | |
133 | |
134 private static int getUnixProcessId(Process unixProcess) throws Exception { | |
135 Field pidField = unixProcess.getClass().getDeclaredField("pid"); | |
136 pidField.setAccessible(true); | |
137 return (Integer)pidField.get(unixProcess); | |
138 } | |
139 } |