Also seeing this with 15.10 message.log attached, jstack output below (cannot attach multiple files) -------jstack-------------- 2015-12-08 13:23:20 Full thread dump OpenJDK 64-Bit Server VM (24.91-b01 mixed mode): "Attach Listener" daemon prio=10 tid=0x00007f3ed4001000 nid=0x34ec waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Deadlock Detector" prio=10 tid=0x00007f3eb597d000 nid=0x32f7 waiting on condition [0x00007f3e7f9e2000] java.lang.Thread.State: TIMED_WAITING (sleeping) at java.lang.Thread.sleep(Native Method) at org.netbeans.modules.deadlock.detector.Detector.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Thread-4" daemon prio=10 tid=0x00007f3eb5958800 nid=0x32f6 in Object.wait() [0x00007f3e7fdec000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000f1fe55c0> (a java.util.LinkedList) at java.lang.Object.wait(Object.java:503) at java.util.prefs.AbstractPreferences$EventDispatchThread.run(AbstractPreferences.java:1476) - locked <0x00000000f1fe55c0> (a java.util.LinkedList) Locked ownable synchronizers: - None "File Watcher" daemon prio=10 tid=0x0000000000954000 nid=0x32f4 runnable [0x00007f3ea90f8000] java.lang.Thread.State: RUNNABLE at com.sun.jna.Native.invokeInt(Native Method) at com.sun.jna.Function.invoke(Function.java:390) at com.sun.jna.Function.invoke(Function.java:323) at com.sun.jna.Library$Handler.invoke(Library.java:236) at org.netbeans.modules.masterfs.watcher.linux.$Proxy2.read(Unknown Source) at org.netbeans.modules.masterfs.watcher.linux.LinuxNotifier.nextEventPath(Unknown Source) at org.netbeans.modules.masterfs.watcher.linux.LinuxNotifier.nextEvent(Unknown Source) at org.netbeans.modules.masterfs.providers.Notifier$1.nextEvent(Unknown Source) at org.netbeans.modules.masterfs.watcher.Watcher$Ext.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Bundle File Closer" daemon prio=10 tid=0x00007f3eb57b1000 nid=0x32ed in Object.wait() [0x00007f3ea9f12000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d4648508> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at java.lang.Object.wait(Object.java:503) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x00000000d4648508> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Framework Event Dispatcher" daemon prio=10 tid=0x00007f3eb51f1800 nid=0x32ec in Object.wait() [0x00007f3eaa113000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d4648690> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at java.lang.Object.wait(Object.java:503) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.getNextEvent(EventManager.java:400) - locked <0x00000000d4648690> (a org.eclipse.osgi.framework.eventmgr.EventManager$EventThread) at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:336) Locked ownable synchronizers: - None "Framework Active Thread" prio=10 tid=0x00007f3eb4da0000 nid=0x32ea in Object.wait() [0x00007f3eaa515000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d4f3aab0> (a org.eclipse.osgi.framework.internal.core.Framework) at org.eclipse.osgi.framework.internal.core.Framework.run(Framework.java:1862) - locked <0x00000000d4f3aab0> (a org.eclipse.osgi.framework.internal.core.Framework) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Thread-1" prio=10 tid=0x00007f3e9c002800 nid=0x32e7 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "AWT-EventQueue-1" prio=10 tid=0x00007f3eb415c000 nid=0x32e8 runnable [0x00007f3eaa96b000] java.lang.Thread.State: RUNNABLE at sun.awt.UNIXToolkit.load_gtk(Native Method) at sun.awt.UNIXToolkit.loadGTK(UNIXToolkit.java:108) - locked <0x00000000d4062700> (a java.lang.Object) at com.sun.java.swing.plaf.gtk.GTKLookAndFeel.initialize(GTKLookAndFeel.java:1452) at javax.swing.UIManager.setLookAndFeel(UIManager.java:535) at org.netbeans.swing.plaf.Startup.initialize(Unknown Source) at org.netbeans.swing.plaf.Startup.(Unknown Source) at org.netbeans.swing.plaf.Startup.run(Unknown Source) at org.netbeans.core.CoreBridgeImpl$1$1.run(Unknown Source) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745) at java.awt.EventQueue.access$300(EventQueue.java:103) at java.awt.EventQueue$3.run(EventQueue.java:706) at java.awt.EventQueue$3.run(EventQueue.java:704) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:77) at java.awt.EventQueue.dispatchEvent(EventQueue.java:715) at org.GNOME.Accessibility.AtkWrapper$5.dispatchEvent(AtkWrapper.java:697) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.run(EventDispatchThread.java:91) Locked ownable synchronizers: - None "AWT-EventQueue-0" prio=10 tid=0x00007f3eb4101800 nid=0x32e6 waiting on condition [0x00007f3eab36e000] java.lang.Thread.State: WAITING (parking) at sun.misc.Unsafe.park(Native Method) - parking to wait for <0x00000000d43010c8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject) at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043) at java.awt.EventQueue.getNextEvent(EventQueue.java:555) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138) at java.awt.EventDispatchThread.run(EventDispatchThread.java:91) Locked ownable synchronizers: - None "AWT-Shutdown" prio=10 tid=0x00007f3eb40f7000 nid=0x32e5 in Object.wait() [0x00007f3eab56f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d45ed088> (a java.lang.Object) at java.lang.Object.wait(Object.java:503) at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:296) - locked <0x00000000d45ed088> (a java.lang.Object) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "AWT-XAWT" daemon prio=10 tid=0x00007f3eb40ce000 nid=0x32e2 runnable [0x00007f3ef2667000] java.lang.Thread.State: RUNNABLE at sun.awt.X11.XToolkit.waitForEvents(Native Method) at sun.awt.X11.XToolkit.run(XToolkit.java:541) at sun.awt.X11.XToolkit.run(XToolkit.java:505) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "Java2D Disposer" daemon prio=10 tid=0x00007f3eb40ab800 nid=0x32e1 in Object.wait() [0x00007f3ef2c78000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d4612c00> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135) - locked <0x00000000d4612c00> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151) at sun.java2d.Disposer.run(Disposer.java:145) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "RequestProcessor queue manager" daemon prio=10 tid=0x00007f3eb406e000 nid=0x32e0 in Object.wait() [0x00007f3ef34e5000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d42944d8> (a java.lang.Class for org.openide.util.RequestProcessor$TickTac) at org.openide.util.RequestProcessor$TickTac.obtainFirst(Unknown Source) - locked <0x00000000d42944d8> (a java.lang.Class for org.openide.util.RequestProcessor$TickTac) at org.openide.util.RequestProcessor$TickTac.run(Unknown Source) Locked ownable synchronizers: - None "main" prio=10 tid=0x00007f3f0822b000 nid=0x32df in Object.wait() [0x00007f3ef36e6000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000f5a8b068> (a java.awt.EventQueue$1AWTInvocationLock) at java.lang.Object.wait(Object.java:503) at java.awt.EventQueue.invokeAndWait(EventQueue.java:1282) - locked <0x00000000f5a8b068> (a java.awt.EventQueue$1AWTInvocationLock) at java.awt.EventQueue.invokeAndWait(EventQueue.java:1263) at org.openide.util.Mutex.doEventAccess(Unknown Source) at org.openide.util.Mutex.writeAccess(Unknown Source) at org.netbeans.core.TimableEventQueue.initialize(Unknown Source) at org.netbeans.core.TimableEventQueue.initialize(Unknown Source) at org.netbeans.core.GuiRunLevel.initializeMainWindow(Unknown Source) at org.netbeans.core.GuiRunLevel.run(Unknown Source) at org.netbeans.core.startup.Main.start(Unknown Source) at org.netbeans.core.startup.TopThreadGroup.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Locked ownable synchronizers: - None "CLI Requests Server" daemon prio=10 tid=0x00007f3f081ed800 nid=0x32dd runnable [0x00007f3f00751000] java.lang.Thread.State: RUNNABLE at java.net.PlainSocketImpl.socketAccept(Native Method) at java.net.AbstractPlainSocketImpl.accept(AbstractPlainSocketImpl.java:398) at java.net.ServerSocket.implAccept(ServerSocket.java:530) at java.net.ServerSocket.accept(ServerSocket.java:498) at org.netbeans.CLIHandler$Server.run(Unknown Source) Locked ownable synchronizers: - None "Active Reference Queue Daemon" daemon prio=10 tid=0x00007f3f081ce000 nid=0x32dc in Object.wait() [0x00007f3f00952000] java.lang.Thread.State: TIMED_WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d45b4f88> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135) - locked <0x00000000d45b4f88> (a java.lang.ref.ReferenceQueue$Lock) at org.openide.util.lookup.implspi.ActiveQueue$Daemon.run(Unknown Source) - locked <0x00000000d45b4f88> (a java.lang.ref.ReferenceQueue$Lock) Locked ownable synchronizers: - None "Service Thread" daemon prio=10 tid=0x00007f3f080b0800 nid=0x32da runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C2 CompilerThread1" daemon prio=10 tid=0x00007f3f080ae800 nid=0x32d9 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "C2 CompilerThread0" daemon prio=10 tid=0x00007f3f080ab800 nid=0x32d8 waiting on condition [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Signal Dispatcher" daemon prio=10 tid=0x00007f3f080a9000 nid=0x32d7 runnable [0x0000000000000000] java.lang.Thread.State: RUNNABLE Locked ownable synchronizers: - None "Finalizer" daemon prio=10 tid=0x00007f3f0807e000 nid=0x32d6 in Object.wait() [0x00007f3f0c6c7000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d4347168> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:135) - locked <0x00000000d4347168> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:151) at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209) Locked ownable synchronizers: - None "Reference Handler" daemon prio=10 tid=0x00007f3f0807b800 nid=0x32d5 in Object.wait() [0x00007f3f0c8c8000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d4346bd0> (a java.lang.ref.Reference$Lock) at java.lang.Object.wait(Object.java:503) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133) - locked <0x00000000d4346bd0> (a java.lang.ref.Reference$Lock) Locked ownable synchronizers: - None "main" prio=10 tid=0x00007f3f0800b800 nid=0x32cf in Object.wait() [0x00007f3f0f7db000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x00000000d46484a0> (a org.netbeans.core.startup.TopThreadGroup) at java.lang.Object.wait(Object.java:503) at org.netbeans.core.startup.TopThreadGroup.start(Unknown Source) - locked <0x00000000d46484a0> (a org.netbeans.core.startup.TopThreadGroup) at org.netbeans.core.startup.Main.main(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.netbeans.MainImpl.main(Unknown Source) at org.netbeans.Main.main(Unknown Source) Locked ownable synchronizers: - None "VM Thread" prio=10 tid=0x00007f3f08077800 nid=0x32d4 runnable "GC task thread#0 (ParallelGC)" prio=10 tid=0x00007f3f08021800 nid=0x32d0 runnable "GC task thread#1 (ParallelGC)" prio=10 tid=0x00007f3f08023800 nid=0x32d1 runnable "GC task thread#2 (ParallelGC)" prio=10 tid=0x00007f3f08025000 nid=0x32d2 runnable "GC task thread#3 (ParallelGC)" prio=10 tid=0x00007f3f08027000 nid=0x32d3 runnable "VM Periodic Task Thread" prio=10 tid=0x00007f3f080bb800 nid=0x32db waiting on condition JNI global references: 508