java/util/concurrent/tck/JSR166TestCase.java fails nanoTime test

JavaTest Message: JUnit Failure: testNanoTime(SystemTest): null
junit.framework.AssertionFailedError
at junit.framework.Assert.fail(Assert.java:55)
at junit.framework.Assert.assertTrue(Assert.java:22)
at junit.framework.Assert.assertTrue(Assert.java:31)
at junit.framework.TestCase.assertTrue(TestCase.java:200)
at SystemTest.testNanoTime(SystemTest.java:73)


public void testNanoTime() throws InterruptedException {
        long m0 = System.currentTimeMillis();
        long n0 = System.nanoTime();
        Thread.sleep(1);
        long m1 = System.currentTimeMillis();
        long n1 = System.nanoTime();
        Thread.sleep(50); // avoid possibly scaled SHORT_DELAY_MS
        long m2 = System.currentTimeMillis();
        long n2 = System.nanoTime();
        Thread.sleep(1);
        long m3 = System.currentTimeMillis();
        long n3 = System.nanoTime();
        assertTrue((n2 - n1) / 1_000_000 <= m3 - m0 + MILLIS_ROUND);
        assertTrue(m2 - m1 <= (n3 - n0) / 1_000_000 + MILLIS_ROUND);
    }

It is the final assertion that is failing.

Platform: macOS x64

The test really should print all the values so they can be examined in case of failures like this.