All these tests fail on Linux (Ubuntu 16.04) with similar or identical errors :
java/awt/Modal/FileDialog/FileDialogTKModal1Test.java
java/awt/Modal/FileDialog/FileDialogTKModal2Test.java
java/awt/Modal/FileDialog/FileDialogTKModal3Test.java
java/awt/Modal/FileDialog/FileDialogTKModal4Test.java
java/awt/Modal/FileDialog/FileDialogTKModal5Test.java
java/awt/Modal/FileDialog/FileDialogTKModal6Test.java
----------System.out:(0/0)----------
----------System.err:(19/1480)----------
java.lang.RuntimeException: DummyButton on blocked Dialog triggered action when clicked. FileDialog should block this Dialog.: expected false, was true
at jdk.testlibrary.Asserts.fail(Asserts.java:540)
at jdk.testlibrary.Asserts.assertFalse(Asserts.java:465)
at TestDialog.checkBlockedDialog(TestDialog.java:329)
at FileDialogFWDTest.checkBlockedWindows(FileDialogFWDTest.java:133)
at FileDialogFWDTest.modalTest(FileDialogFWDTest.java:148)
at FileDialogFWDTest.doTest(FileDialogFWDTest.java:234)
at FileDialogTKModal1Test.main(FileDialogTKModal1Test.java:48)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:115)
at java.base/java.lang.Thread.run(Thread.java:844)

JavaTest Message: Test threw exception: java.lang.RuntimeException: DummyButton on blocked Dialog triggered action when clicked. FileDialog should block this Dialog.: expected false, was true
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: DummyButton on blocked Dialog triggered action when clicked. FileDialog should block this Dialog.: expected false, was true