1181 2015-07-26 04:45:03 +0200 JOGL WebStart Applications using GLCanvas/AWT may Deadlock by two AWT-EDT on Java >= 1.8.0_45 2015-09-27 01:11:11 +0200 1 1 3 JogAmp Jogl awt 2.3.2 pc_all linux RESOLVED FIXED P2 major --- 1184 1 sgothel sgothel DEFECT b0af5159bc6100a6262afe6b52f9092a207ac2b3 --- oldest_to_newest 4819 0 sgothel 2015-07-26 04:45:03 +0200 Platform GNU/Linux X11 Java: 1.8.0_45 and 1.8.0_51 Deadlock appears to happen at launch via WebStart on X11 due to _two_ AWT-EDT holding the AWT tree lock. The final deadlocked call comes from JOGL's JAWTWindow issuing GLCanvas/AWT's Component.getGraphicsConfiguration(..). +++ "AWT-EventQueue-2": at java.awt.Component.getGraphicsConfiguration(Component.java:1145) - waiting to lock <0x00000006c6204248> (a java.awt.Component$AWTTreeLock) at com.jogamp.opengl.awt.GLCanvas.getGraphicsConfiguration(GLCanvas.java:351) at com.jogamp.nativewindow.awt.JAWTWindow.updatePixelScale(JAWTWindow.java:347) at com.jogamp.nativewindow.awt.JAWTWindow.updateLockedData(JAWTWindow.java:333) at jogamp.nativewindow.jawt.x11.X11JAWTWindow.lockSurfaceImpl(X11JAWTWindow.java:97) at com.jogamp.nativewindow.awt.JAWTWindow.lockSurface(JAWTWindow.java:624) at jogamp.opengl.GLDrawableImpl.lockSurface(GLDrawableImpl.java:315) at jogamp.opengl.GLContextImpl.makeCurrent(GLContextImpl.java:596) at jogamp.opengl.GLContextImpl.makeCurrent(GLContextImpl.java:580) at jogamp.opengl.GLDrawableHelper.invokeGLImpl(GLDrawableHelper.java:1263) at jogamp.opengl.GLDrawableHelper.invokeGL(GLDrawableHelper.java:1131) at com.jogamp.opengl.awt.GLCanvas$12.run(GLCanvas.java:1435) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:301) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) "AWT-EventQueue-1": at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000006c64ba3f8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:870) at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1199) at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:209) at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) at sun.awt.SunToolkit.awtLock(SunToolkit.java:253) at sun.font.XRTextRenderer.drawGlyphList(XRTextRenderer.java:63) at sun.java2d.pipe.GlyphListPipe.drawChars(GlyphListPipe.java:104) at sun.java2d.SunGraphics2D.drawChars(SunGraphics2D.java:3036) at sun.swing.SwingUtilities2.drawChars(SwingUtilities2.java:857) at javax.swing.text.Utilities.drawTabbedText(Utilities.java:176) at javax.swing.text.Utilities.drawTabbedText(Utilities.java:106) at javax.swing.text.PlainView.drawUnselectedText(PlainView.java:154) at javax.swing.text.PlainView.drawElement(PlainView.java:113) at javax.swing.text.PlainView.drawLine(PlainView.java:82) at javax.swing.text.PlainView.paint(PlainView.java:311) at javax.swing.plaf.basic.BasicTextUI$RootView.paint(BasicTextUI.java:1434) at javax.swing.plaf.basic.BasicTextUI.paintSafely(BasicTextUI.java:737) at javax.swing.plaf.basic.BasicTextUI.paint(BasicTextUI.java:881) at javax.swing.plaf.basic.BasicTextUI.update(BasicTextUI.java:860) at javax.swing.JComponent.paintComponent(JComponent.java:780) at javax.swing.JComponent.paint(JComponent.java:1056) at javax.swing.JComponent.paintChildren(JComponent.java:889) - locked <0x00000006c6204248> (a java.awt.Component$AWTTreeLock) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JViewport.paint(JViewport.java:728) at javax.swing.JComponent.paintChildren(JComponent.java:889) - locked <0x00000006c6204248> (a java.awt.Component$AWTTreeLock) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5219) at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:290) at javax.swing.RepaintManager.paint(RepaintManager.java:1265) at javax.swing.JComponent._paintImmediately(JComponent.java:5167) at javax.swing.JComponent.paintImmediately(JComponent.java:4978) at javax.swing.RepaintManager$4.run(RepaintManager.java:824) at javax.swing.RepaintManager$4.run(RepaintManager.java:807) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:807) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:782) at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:731) 4820 1 sgothel 2015-07-26 05:18:39 +0200 Found one Java-level deadlock: ============================= "AWT-EventQueue-2": waiting to lock monitor 0x00007fca300048a8 (object 0x00000006c6204248, a java.awt.Component$AWTTreeLock), which is held by "AWT-EventQueue-1" ^^ JAWTWindow trying to get monitor AWT-TreeLock, but holds lock SunToolkit.awtLock (0x00000006c64ba3f8), see below. ++ "AWT-EventQueue-1": waiting for ownable synchronizer 0x00000006c64ba3f8, (a java.util.concurrent.locks.ReentrantLock$NonfairSync), which is held by "AWT-EventQueue-2" Trying to acquire lock SunToolkit.awtLock (0x00000006c64ba3f8), but holds monitor AWT-TreeLock (0x00007fca300048a8). 4825 2 sgothel 2015-07-27 20:01:55 +0200 Root cause: - AWT Toolkit global Lock Our locking scheme (AWT-EDT-1): - Surface Lock - sun.awt.SunToolkit.awtLock() - Component.getGraphicsConfiguration() -> synchronized(Component.getTreeLock()) Other AWT-EDT-2 by Webstart: - synchronized(Component.getTreeLock()) - sun.awt.SunToolkit.awtLock() Results in a deadlock. Solution: - Issue Component.getGraphicsConfiguration() before awtLock() +++ Further code analysis 4826 3 sgothel 2015-07-27 20:05:38 +0200 commit b0af5159bc6100a6262afe6b52f9092a207ac2b3 - Issue Component.getGraphicsConfiguration() before awtLock(), where Component.getGraphicsConfiguration() is being used to detect possible reconfiguration. - Also use updated AWTGraphicsConfiguration's GraphicsConfiguration if no 'new' detection is required.