1 /*
   2  * Copyright (c) 2015, 2017, 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 8137230
  27  * @summary (fc) Infinite loop FileChannel.truncate
  28  * @library /test/lib
  29  * @build jdk.test.lib.Utils
  30  * @run main/othervm/timeout=300 LoopingTruncate
  31  */
  32 
  33 import java.nio.ByteBuffer;
  34 import java.nio.channels.FileChannel;
  35 import java.nio.channels.ClosedByInterruptException;
  36 import java.nio.file.Files;
  37 import java.nio.file.Path;
  38 import static java.nio.file.StandardOpenOption.*;
  39 import java.util.concurrent.TimeUnit;
  40 import static jdk.test.lib.Utils.adjustTimeout;
  41 
  42 public class LoopingTruncate {
  43 
  44     // (int)FATEFUL_SIZE == -3 == IOStatus.INTERRUPTED
  45     static long FATEFUL_SIZE = 0x1FFFFFFFDL;
  46 
  47     // At least 20 seconds
  48     static long TIMEOUT = adjustTimeout(20_000);
  49 
  50     public static void main(String[] args) throws Throwable {
  51         Path path = Files.createTempFile("LoopingTruncate.tmp", null);
  52         try (FileChannel fc = FileChannel.open(path, CREATE, WRITE)) {
  53             fc.position(FATEFUL_SIZE + 1L);
  54             System.out.println("  Writing large file...");
  55             long t0 = System.nanoTime();
  56             fc.write(ByteBuffer.wrap(new byte[] {0}));
  57             long t1 = System.nanoTime();
  58             System.out.printf("  Wrote large file in %d ns (%d ms) %n",
  59                 t1 - t0, TimeUnit.NANOSECONDS.toMillis(t1 - t0));
  60 
  61             Thread th = new Thread(() -> {
  62                 try {
  63                     System.out.println("  Truncating large file...");
  64                     long t2 = System.nanoTime();
  65                     fc.truncate(FATEFUL_SIZE);
  66                     long t3 = System.nanoTime();
  67                     System.out.printf("  Truncated large file in %d ns (%d ms) %n",
  68                         t3 - t2, TimeUnit.NANOSECONDS.toMillis(t3 - t2));
  69                 } catch (ClosedByInterruptException ignore) {
  70                 } catch (Exception e) {
  71                     throw new RuntimeException(e);
  72                 }});
  73             th.start();
  74             th.join(TIMEOUT);
  75 
  76             if (th.isAlive()) {
  77                 System.err.println("=== Stack trace of the guilty thread:");
  78                 for (StackTraceElement el : th.getStackTrace()) {
  79                     System.err.println("\t" + el);
  80                 }
  81                 System.err.println("===");
  82 
  83                 th.interrupt();
  84                 th.join();
  85                 throw new RuntimeException("Failed to complete on time");
  86             }
  87         } finally {
  88             Files.deleteIfExists(path);
  89         }
  90 
  91         System.out.println("Test succeeded.");
  92         System.out.flush();
  93     }
  94 }