1 /*
   2  * Copyright (c) 2015, 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 8137121
  27  * @summary Infinite loop in sun.nio.ch.FileChannelImpl.truncate
  28  * @run main/othervm InfTrunc
  29  */
  30 
  31 import java.io.IOException;
  32 import java.nio.ByteBuffer;
  33 import java.nio.channels.FileChannel;
  34 import java.nio.channels.SeekableByteChannel;
  35 import java.nio.file.Files;
  36 import java.nio.file.Path;
  37 import static java.nio.file.StandardOpenOption.*;
  38 import java.util.EnumSet;
  39 
  40 public class InfTrunc {
  41 
  42     // (int)FATEFUL_SIZE == -3 == IOStatus.INTERRUPTED
  43     static long FATEFUL_SIZE = 0x1FFFFFFFDL;
  44 
  45     static long TIMEOUT = 10_000; // 10 seconds
  46 
  47     public static void main(String[] args) throws Throwable {
  48         Path path = Files.createTempFile("inftrunc", null);
  49         try {
  50             Thread th = new Thread(() -> {
  51                 try (SeekableByteChannel ch = Files.newByteChannel(path,
  52                         EnumSet.of(CREATE, WRITE))) {
  53                     ch.position(FATEFUL_SIZE + 1L);
  54                     ch.write(ByteBuffer.wrap(new byte[] {0}));
  55                     ch.truncate(FATEFUL_SIZE);
  56                 } catch (IOException ioe) {
  57                     throw new RuntimeException(ioe);
  58                 }});
  59             th.start();
  60             th.join(TIMEOUT);
  61 
  62             if (th.isAlive()) {
  63                 th.interrupt();
  64                 throw new RuntimeException("Failed to complete on time");
  65             }
  66         } finally {
  67             Files.deleteIfExists(path);
  68         }
  69     }
  70 }