FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+140)
Java HotSpot(TM) Server VM (build 9-ea+140, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 10.0.14393]

A DESCRIPTION OF THE PROBLEM :
Positioning of diacritical marks for rendering of e.g. Arabic text is incorrect (shifted vertically with respect to correct position).
This seems to be a regression introduced with the change in http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/a0c8eb083f39, flipping the sign of y glyph offset when processing data returned by Harfbuzz.

REGRESSION. Last worked in version 9

ADDITIONAL REGRESSION INFORMATION:
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+136)
Java HotSpot(TM) Server VM (build 9-ea+136, mixed mode)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run a sample program with the source given below.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Diacritics in the rendered text are located at correct positions (as can be seen when running using 9-ea+136 or latest Java 8 build).
ACTUAL -
Some diacritics are rendered lower than expected.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;

public class JLabelTest {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            JFrame frame = new JFrame();
            JLabel label = new JLabel("العَرَبِيَّة");
            label.setFont(new Font("Courier New", Font.PLAIN, 36));
            frame.add(label);
            frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });

    }
}

---------- END SOURCE ----------