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Bug ID: 6786210
Votes 0
Synopsis Deadlock occurs when handling mouseLeave on XToolkit
Category java:classes_awt
Reported Against
Release Fixed 6u12(b04)
State 10-Fix Delivered, bug
Priority: 1-Very High
Related Bugs 6730439 , 6786953 , 6796971
Submit Date 17-DEC-2008
Description 
The problem is reported here: http://forums.java.net/jive/thread.jspa?messageID=322051

The stack trace of the deadlock:

Name: AWT-XAWT
State: BLOCKED on   xxxxx@xxxxx   owned by: AWT-EventQueue-1
Total blocked: 29 Total waited: 1,837

Stack trace: 
sun.awt.X11.XWindow.setMouseAbove(XWindow.java:789)
sun.awt.X11.XWindowPeer.setMouseAbove(XWindowPeer.java:1012)
sun.awt.X11.XWindow.leaveNotify(XWindow.java:799)
sun.awt.X11.XWindow.handleXCrossingEvent(XWindow.java:812)
sun.awt.X11.XWindowPeer.handleXCrossingEvent(XWindowPeer.java:1765)
sun.awt.X11.XBaseWindow.dispatchEvent(XBaseWindow.java:1119)
sun.awt.X11.XBaseWindow.dispatchToWindow(XBaseWindow.java:1079)
sun.awt.X11.XToolkit.dispatchEvent(XToolkit.java:475)
sun.awt.X11.XToolkit.run(XToolkit.java:588)
sun.awt.X11.XToolkit.run(XToolkit.java:523)
java.lang.Thread.run(Thread.java:619)

Name: AWT-EventQueue-1
State: WAITING on java.util.concurrent.locks.ReentrantLock$  xxxxx@xxxxx   owned by: AWT-XAWT
Total blocked: 18,133 Total waited: 19,299

Stack trace: 
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:778)
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114)
java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
sun.awt.SunToolkit.awtLock(SunToolkit.java:241)
sun.awt.X11.XDropTargetRegistry.unregisterDropSite(XDropTargetRegistry.java:569)
sun.awt.X11.XWindowPeer.removeDropTarget(XWindowPeer.java:1634)
- locked   xxxxx@xxxxx  
sun.awt.X11.XComponentPeer.removeDropTarget(XComponentPeer.java:1511)
java.awt.dnd.DropTarget.removeNotify(DropTarget.java:517)
java.awt.Component.removeNotify(Component.java:6721)
- locked java.awt.Component$  xxxxx@xxxxx  
java.awt.Container.removeNotify(Container.java:2611)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
org.openide.explorer.view.ListView$NbList.removeNotify(ListView.java:834)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
org.openide.explorer.view.ListView.removeNotify(ListView.java:607)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
javax.swing.JComponent.removeNotify(JComponent.java:4699)
javax.swing.JRootPane.removeNotify(JRootPane.java:750)
java.awt.Container.removeNotify(Container.java:2604)
- locked java.awt.Component$  xxxxx@xxxxx  
java.awt.Window.removeNotify(Window.java:685)
- locked java.awt.Component$  xxxxx@xxxxx  
org.netbeans.core.windows.services.NbPresenter.removeNotify(NbPresenter.java:349)
java.awt.Window$1DisposeAction.run(Window.java:1013)
java.awt.Window.doDispose(Window.java:1025)
java.awt.Dialog.doDispose(Dialog.java:1248)
java.awt.Window.dispose(Window.java:972)
org.openide.explorer.propertysheet.PropertyDialogManager.actionPerformed(PropertyDialogManager.java:543)
org.netbeans.core.windows.services.NbPresenter$ButtonListener.actionPerformed(NbPresenter.java:1137)
javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
java.awt.Component.processMouseEvent(Component.java:6213)
javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
java.awt.Component.processEvent(Component.java:5978)
java.awt.Container.processEvent(Container.java:2036)
java.awt.Component.dispatchEventImpl(Component.java:4580)
java.awt.Container.dispatchEventImpl(Container.java:2094)
java.awt.Component.dispatchEvent(Component.java:4410)
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4551)
java.awt.LightweightDispatcher.processMouseEvent(Container.java:4215)
java.awt.LightweightDispatcher.dispatchEvent(Container.java:4145)
java.awt.Container.dispatchEventImpl(Container.java:2080)
java.awt.Window.dispatchEventImpl(Window.java:2475)
java.awt.Component.dispatchEvent(Component.java:4410)
java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178)
java.awt.Dialog$1.run(Dialog.java:1051)
java.awt.Dialog$3.run(Dialog.java:1103)
java.security.AccessController.doPrivileged(Native Method)
java.awt.Dialog.show(Dialog.java:1101)
org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:867)
org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:901)
org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:889)
org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:109)
org.openide.util.Mutex.doEventAccess(Mutex.java:1355)
org.openide.util.Mutex.readAccess(Mutex.java:268)
org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:874)
java.awt.Component.show(Component.java:1513)
java.awt.Component.setVisible(Component.java:1465)
java.awt.Window.setVisible(Window.java:841)
java.awt.Dialog.setVisible(Dialog.java:991)
org.openide.explorer.propertysheet.CustomEditorAction.actionPerformed(CustomEditorAction.java:318)
org.openide.explorer.propertysheet.SheetTable.processMouseEvent(SheetTable.java:710)
java.awt.Component.processEvent(Component.java:5978)
java.awt.Container.processEvent(Container.java:2036)
java.awt.Component.dispatchEventImpl(Component.java:4580)
java.awt.Container.dispatchEventImpl(Container.java:2094)
java.awt.Component.dispatchEvent(Component.java:4410)
java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4551)
java.awt.LightweightDispatcher.processMouseEvent(Container.java:4212)
java.awt.LightweightDispatcher.dispatchEvent(Container.java:4145)
java.awt.Container.dispatchEventImpl(Container.java:2080)
java.awt.Window.dispatchEventImpl(Window.java:2475)
java.awt.Component.dispatchEvent(Component.java:4410)
java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Posted Date : 2008-12-17 11:10:15.0
Work Around 
N/A
Evaluation 
This is a regression of 6730439 which introduced the method XWindow.setMouseAbove().

This method uses 'this' synchronization on the window peer object to synchronize access to the private boolean data field. However this is a bad practice since many other methods use 'this' synchronization in different cases. It may cause deadlocks under some circumstances, one of them is reported as this bug.

The methods (as well as the method isMouseAbove()) must be changed to use some private object for synchronization purposes.
Posted Date : 2008-12-17 11:10:15.0
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