The following unit test fails consistently on Linux:

com.sun.javafx.css.Node_cssStyleMap_Test > testStyleMapTracksChanges FAILED
    java.lang.AssertionError: expected:<3> but was:<0>
        at org.junit.Assert.fail(Assert.java:91)
        at org.junit.Assert.failNotEquals(Assert.java:645)
        at org.junit.Assert.assertEquals(Assert.java:126)
        at org.junit.Assert.assertEquals(Assert.java:470)
        at org.junit.Assert.assertEquals(Assert.java:454)
        at com.sun.javafx.css.Node_cssStyleMap_Test.testStyleMapTracksChanges(Node_cssStyleMap_Test.java:199)