jdk/test/java/nio/channels/FileChannel/LoopingTruncate.java

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/**
 * @test
 * @bug 8137121 8137230
 * @summary (fc) Infinite loop FileChannel.truncate
 * @library /lib/testlibrary
 * @build jdk.testlibrary.Utils
 * @run main/othervm LoopingTruncate
 */

import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.ClosedByInterruptException;
import java.nio.file.Files;
import java.nio.file.Path;
import static java.nio.file.StandardOpenOption.*;
import static jdk.testlibrary.Utils.adjustTimeout;

public class LoopingTruncate {

    // (int)FATEFUL_SIZE == -3 == IOStatus.INTERRUPTED
    static long FATEFUL_SIZE = 0x1FFFFFFFDL;

    // At least 20 seconds
    static long TIMEOUT = adjustTimeout(20_000);

    public static void main(String[] args) throws Throwable {
        Path path = Files.createTempFile("LoopingTruncate.tmp", null);
        try (FileChannel fc = FileChannel.open(path, CREATE, WRITE)) {
            fc.position(FATEFUL_SIZE + 1L);
            fc.write(ByteBuffer.wrap(new byte[] {0}));

            Thread th = new Thread(() -> {
                try {
                    fc.truncate(FATEFUL_SIZE);
                } catch (ClosedByInterruptException ignore) {
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }});
            th.start();
            th.join(TIMEOUT);

            if (th.isAlive()) {
                System.err.println("=== Stack trace of the guilty thread:");
                for (StackTraceElement el : th.getStackTrace()) {
                    System.err.println("\t" + el);
                }
                System.err.println("===");

                th.interrupt();
                th.join();
                throw new RuntimeException("Failed to complete on time");
            }
        } finally {
            Files.deleteIfExists(path);
        }
    }
}