Looks like a new SWT error in our Eclipse.ui and JDT tests. I opened
https://bugs.eclipse.org/bugs/show_bug.cgi?id=459863 for this.
org.eclipse.swt.internal.gtk.OS._gtk_tree_view_get_grid_lines(J)I
java.lang.UnsatisfiedLinkError: org.eclipse.swt.internal.gtk.OS._gtk_tree_view_get_grid_lines(J)I
at org.eclipse.swt.internal.gtk.OS._gtk_tree_view_get_grid_lines(Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_tree_view_get_grid_lines(OS.java:13847)
at org.eclipse.swt.widgets.Tree.calculateWidth(Tree.java:455)
at org.eclipse.swt.widgets.Tree.setScrollWidth(Tree.java:3238)
at org.eclipse.swt.widgets.Tree.cellDataProc(Tree.java:298)
at org.eclipse.swt.widgets.Display.cellDataProc(Display.java:761)
at org.eclipse.swt.internal.gtk.OS._gtk_widget_size_request(Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_widget_size_request(OS.java:14775)
at org.eclipse.swt.widgets.Widget.gtk_widget_get_preferred_size(Widget.java:2207)
at org.eclipse.swt.widgets.Control.gtk_widget_size_request(Control.java:3508)
at org.eclipse.swt.widgets.Tree.gtk_widget_size_request(Tree.java:2179)
at org.eclipse.swt.widgets.Control.setBounds(Control.java:988)
at org.eclipse.swt.widgets.Composite.setBounds(Composite.java:1438)
at org.eclipse.swt.widgets.Tree.setBounds(Tree.java:3068)
at org.eclipse.swt.widgets.Control.setBounds(Control.java:879)
at org.eclipse.swt.layout.FillLayout.layout(FillLayout.java:204)
at org.eclipse.swt.widgets.Composite.updateLayout(Composite.java:1655)
at org.eclipse.swt.widgets.Shell.resizeBounds(Shell.java:1777)
at org.eclipse.swt.widgets.Shell.gtk_size_allocate(Shell.java:1518)
at org.eclipse.swt.widgets.Widget.windowProc(Widget.java:2129)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:5563)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4712)
at org.eclipse.swt.internal.gtk.OS._gtk_widget_show(Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_widget_show(OS.java:14748)
at org.eclipse.swt.widgets.Shell.setVisible(Shell.java:2242)
at org.eclipse.swt.widgets.Shell.open(Shell.java:1594)
at org.eclipse.jface.tests.viewers.ViewerTestCase.openBrowser(ViewerTestCase.java:80)
at org.eclipse.jface.tests.viewers.ViewerTestCase.setUp(ViewerTestCase.java:124)
at org.eclipse.jface.tests.viewers.SimpleVirtualLazyTreeViewerTest.setUp(SimpleVirtualLazyTreeViewerTest.java:114)
at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:657)
at org.eclipse.test.EclipseTestRunner.run(EclipseTestRunner.java:310)
at org.eclipse.test.CoreTestApplication.runTests(CoreTestApplication.java:36)
at org.eclipse.test.CoreTestApplication.run(CoreTestApplication.java:32)
at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException(EclipseAppContainer.java:587)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:198)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:648)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:603)
at org.eclipse.equinox.launcher.Main.run(Main.java:1465)
at org.eclipse.equinox.launcher.Main.main(Main.java:1438)
at org.eclipse.core.launcher.Main.main(Main.java:34)