libcore.io.Posix.preadBytes bug reproducible sample

PreadBug.java

// To reproduce the bug:
//
//   j2objc PreadBug.java
//   j2objcc PreadBug.m
//   ./a.out PreadBug
//
// You'll see the following exception:
//
//   java.io.IOException: pread failed: EBADF (Bad file descriptor)

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

public class PreadBug {
    public static void main(String[] args) {
        try {
            byte[] bytesToWrite = "hello, world!".getBytes("UTF-8");

            File tmpFile = File.createTempFile("preadbug-", ".tmp");
            FileOutputStream fos = new FileOutputStream(tmpFile);
            fos.write(bytesToWrite);
            fos.close();

            ByteBuffer buf = ByteBuffer.allocate(bytesToWrite.length);
            RandomAccessFile raf = new RandomAccessFile(tmpFile, "r");
            FileChannel channel = raf.getChannel();
            int bytesRead = channel.read(buf, 0);
            channel.close();

            String dstString = new String(buf.array(), "UTF-8");
            System.out.println(dstString);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Hi