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8277361: java/nio/channels/Channels/ReadXBytes.java fails with OOM error

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Reviewed-by: alanb, lancea
This commit is contained in:
Brian Burkhalter 2021-12-08 17:11:14 +00:00
parent 8af3b27ce9
commit 2478158815
1 changed files with 38 additions and 16 deletions
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54
test/jdk/java/nio/channels/Channels/ReadXBytes.java
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@ -25,12 +25,12 @@
* @test
* @bug 8268435 8274780
* @summary Verify ChannelInputStream methods readAllBytes and readNBytes
* @requires vm.bits == 64
* @requires (sun.arch.data.model == "64" & os.maxMemory >= 16g)
* @library ..
* @library /test/lib
* @build jdk.test.lib.RandomFactory
* @modules java.base/jdk.internal.util
* @run testng/othervm/timeout=900 -Xmx8G ReadXBytes
* @run testng/othervm/timeout=900 -Xmx12G ReadXBytes
* @key randomness
*/
import java.io.File;
@ -38,7 +38,7 @@ import java.io.FileInputStream;
import java.io.FilterInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.Channel;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
@ -46,11 +46,12 @@ import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import static java.nio.file.StandardOpenOption.READ;
import java.util.List;
import java.util.Random;
import jdk.internal.util.ArraysSupport;
import static java.nio.file.StandardOpenOption.*;
import jdk.test.lib.RandomFactory;
import org.testng.Assert;
@ -72,30 +73,51 @@ public class ReadXBytes {
// A length greater than a 32-bit integer can accommodate
private static final long HUGE_LENGTH = Integer.MAX_VALUE + 27L;
// Current directory
private static final Path DIR = Path.of(System.getProperty("test.dir", "."));
// --- Framework ---
// Create a temporary file path
static Path createFilePath() {
String name = String.format("ReadXBytes%d.tmp", System.nanoTime());
return DIR.resolve(name);
}
// Creates a temporary file of a specified length with undefined content
static Path createFile(long length) throws IOException {
File file = File.createTempFile("foo", ".bar");
file.deleteOnExit();
try (RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
raf.setLength(length);
Path path = createFilePath();
path.toFile().deleteOnExit();
try (FileChannel fc = FileChannel.open(path, CREATE_NEW, SPARSE, WRITE)) {
if (length > 0) {
fc.position(length - 1);
fc.write(ByteBuffer.wrap(new byte[] {27}));
}
}
return file.toPath();
return path;
}
// Creates a temporary file of a specified length with random content
static Path createFileWithRandomContent(long length) throws IOException {
Path file = createFile(length);
try (RandomAccessFile raf = new RandomAccessFile(file.toFile(), "rw")) {
long written = 0L;
int bufLength = Math.min(32768, (int)Math.min(length, BIG_LENGTH));
try (FileChannel fc = FileChannel.open(file, WRITE);) {
long pos = 0L;
// if the length exceeds 2 GB, skip the first 2 GB - 1 MB bytes
if (length >= 2L*1024*1024*1024) {
// write the last (length - 2GB - 1MB) bytes
pos = 2047L*1024*1024;
} else if (length > 0) {
// write either the first or last bytes only
long p = Math.min(Math.abs(RAND.nextLong()), length - 1);
pos = RAND.nextBoolean() ? p : length - 1 - p;
}
fc.position(pos);
int bufLength = Math.min(32768, (int)Math.min(length - pos, BIG_LENGTH));
byte[] buf = new byte[bufLength];
while (written < length) {
while (pos < length) {
RAND.nextBytes(buf);
int len = (int)Math.min(bufLength, length - written);
raf.write(buf, 0, len);
written += len;
int len = (int)Math.min(bufLength, length - pos);
pos += fc.write(ByteBuffer.wrap(buf, 0, len));
}
}
return file;