1 /*
   2  * Copyright (c) 2019, Google Inc. All rights reserved.
   3  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  */
  24 import java.lang.ProcessBuilder;
  25 import java.io.BufferedReader;
  26 import java.io.IOException;
  27 import java.io.InputStream;
  28 import java.io.InputStreamReader;
  29 
  30 public class T {
  31     public static boolean run() {
  32         boolean res = false;
  33         String echoInput = "foo";
  34         ProcessBuilder pb = new ProcessBuilder("echo", echoInput);
  35 
  36         try {
  37             // Starting a ProcessBuilder causes the process reaper thread to be
  38             // created. The process reaper thread has small stack size. In JDK
  39             // 13, the REAPER_DEFAULT_STACKSIZE is 128K. With JDK 8, it is 32K.
  40             // Using the process reaper thread can demonstrate the TLS problem.
  41             // The reaper thread can fail with StackOverflow in one of the
  42             // failure mode with certain TLS sizes. In another observed
  43             // failure mode the VM fails to create a thread with error message
  44             // 'Failed to start thread - pthread_create failed'.
  45             System.out.println("Starting a new process ...");
  46             Process process = pb.start();
  47             process.waitFor();
  48             String echoOutput = output(process.getInputStream());
  49             System.out.println("Echo Output: " + echoOutput);
  50             if (echoOutput.equals(echoInput)) {
  51                 res = true;
  52             } else {
  53                 // 'res' is false, fail 
  54                 System.out.println("Unexpected Echo output: " + echoOutput +
  55                                    ", expects: " + echoInput);
  56             }
  57         } catch (Exception e) {
  58             System.out.println(e.toString());
  59             e.printStackTrace();
  60         }
  61         return res;
  62     }
  63 
  64     private static String output(InputStream inputStream) throws IOException {
  65         String s = "";
  66         try (BufferedReader br =
  67                  new BufferedReader(new InputStreamReader(inputStream))) {
  68             s = br.readLine(); 
  69         }
  70         return s;
  71     }
  72 }
  73