Found one Java-level deadlock:
=============================
"Default RequestProcessor":
  waiting to lock monitor 0x002d3248 (object 0x740b0b40, a org.netbeans.modules.server.ui.node.RootNode$ChildFactory),
  which is held by "Lookup Dispatch Thread"
"Lookup Dispatch Thread":
  waiting to lock monitor 0x00f599c8 (object 0x758abac8, a org.netbeans.modules.j2ee.deployment.impl.bridge.ServerInstanceProviderLookup),
  which is held by "Default RequestProcessor"

Java stack information for the threads listed above:
===================================================
"Default RequestProcessor":
        at org.netbeans.modules.server.ui.node.RootNode$ChildFactory.stateChanged(RootNode.java:186)
        - waiting to lock <0x740b0b40> (a org.netbeans.modules.server.ui.node.RootNode$ChildFactory)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:450)
        at $Proxy21.stateChanged(Unknown Source)
        at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:123)
        at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:109)
        at org.netbeans.modules.server.ServerRegistry$ProviderLookupListener.resultChanged(ServerRegistry.java:111)
        at org.openide.util.lookup.AbstractLookup$NotifyListeners.run(AbstractLookup.java:525)
        at org.openide.util.lookup.AbstractLookup.notifyIn(AbstractLookup.java:305)
        at org.openide.util.lookup.AbstractLookup.addPairImpl(AbstractLookup.java:247)
        at org.openide.util.lookup.AbstractLookup.addPair(AbstractLookup.java:214)
        at org.openide.util.lookup.AbstractLookup$Content.addPair(AbstractLookup.java:1201)
        at org.openide.util.lookup.InstanceContent.add(InstanceContent.java:87)
        at org.netbeans.modules.j2ee.deployment.impl.bridge.AbstractServerLookup.stateChanged(AbstractServerLookup.java:159)
        - locked <0x758abac8> (a org.netbeans.modules.j2ee.deployment.impl.bridge.ServerInstanceProviderLookup)
        at org.netbeans.modules.j2ee.deployment.impl.bridge.AbstractServerLookup.serverAdded(AbstractServerLookup.java:78)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:450)
        at $Proxy20.serverAdded(Unknown Source)
        at org.netbeans.modules.j2ee.deployment.impl.ServerRegistry.firePluginListeners(ServerRegistry.java:521)
        at org.netbeans.modules.j2ee.deployment.impl.ServerRegistry.addPlugin(ServerRegistry.java:183)
        at org.netbeans.modules.j2ee.deployment.impl.ServerRegistry.access$200(ServerRegistry.java:74)
        at org.netbeans.modules.j2ee.deployment.impl.ServerRegistry$PluginInstallListener.fileFolderCreated(ServerRegistry.java:236)
        at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:133)
        at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:122)
        at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:99)
        at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1014)
        at org.openide.filesystems.EventControl.invokeDispatchers(EventControl.java:203)
        at org.openide.filesystems.EventControl.exitAtomicAction(EventControl.java:177)
        at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:122)
        at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:509)
        at org.netbeans.core.startup.layers.ModuleLayeredFileSystem.setURLs(ModuleLayeredFileSystem.java:335)
        at org.netbeans.core.startup.layers.ModuleLayeredFileSystem.addURLs(ModuleLayeredFileSystem.java:351)
        at org.netbeans.core.startup.NbInstaller.loadLayers(NbInstaller.java:631)
        at org.netbeans.core.startup.NbInstaller.load(NbInstaller.java:326)
        at org.netbeans.ModuleManager.enable(ModuleManager.java:917)
        at org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForEnable.enable(OperationSupportImpl.java:179)
        at org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForEnable.access$1100(OperationSupportImpl.java:122)
        at org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForEnable$1.run(OperationSupportImpl.java:153)
        at org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForEnable$1.run(OperationSupportImpl.java:151)
        at org.openide.util.Mutex.writeAccess(Mutex.java:433)
        at org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForEnable.doOperation(OperationSupportImpl.java:151)
        - locked <0x73460570> (a org.netbeans.modules.autoupdate.services.OperationSupportImpl$ForEnable)
        at org.netbeans.api.autoupdate.OperationSupport.doOperation(OperationSupport.java:67)
        at org.netbeans.modules.ide.ergonomics.fod.ModulesActivator.doEnableModules(ModulesActivator.java:148)
        at org.netbeans.modules.ide.ergonomics.fod.ModulesActivator.enableModules(ModulesActivator.java:113)
        at org.netbeans.modules.ide.ergonomics.fod.ModulesActivator.access$000(ModulesActivator.java:61)
        at org.netbeans.modules.ide.ergonomics.fod.ModulesActivator$1.run(ModulesActivator.java:106)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:576)
        at org.openide.util.RequestProcessor$Processor.doEvaluate(RequestProcessor.java:1058)
        at org.openide.util.RequestProcessor$Task.waitFinished(RequestProcessor.java:741)
        at org.netbeans.modules.ide.ergonomics.fod.ModulesInstaller.installModules(ModulesInstaller.java:120)
        at org.netbeans.modules.ide.ergonomics.fod.ConfigurationPanel$2.run(ConfigurationPanel.java:186)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:576)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1013)
"Lookup Dispatch Thread":
        at org.netbeans.modules.j2ee.deployment.impl.bridge.AbstractServerLookup.init(AbstractServerLookup.java:121)
        - waiting to lock <0x758abac8> (a org.netbeans.modules.j2ee.deployment.impl.bridge.ServerInstanceProviderLookup)
        at org.netbeans.modules.j2ee.deployment.impl.bridge.AbstractServerLookup.beforeLookup(AbstractServerLookup.java:114)
        at org.openide.util.lookup.AbstractLookup$R.allInstances(AbstractLookup.java:988)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:489)
        at org.openide.util.lookup.ProxyLookup$R.computeResult(ProxyLookup.java:548)
        at org.openide.util.lookup.ProxyLookup$R.allInstances(ProxyLookup.java:489)
        at org.netbeans.modules.server.ServerRegistry.getProviders(ServerRegistry.java:88)
        at org.netbeans.modules.server.ui.node.RootNode$ChildFactory.stateChanged(RootNode.java:192)
        - locked <0x740b0b40> (a org.netbeans.modules.server.ui.node.RootNode$ChildFactory)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:450)
        at $Proxy21.stateChanged(Unknown Source)
        at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:123)
        at org.openide.util.ChangeSupport.fireChange(ChangeSupport.java:109)
        at org.netbeans.modules.server.ServerRegistry$ProviderLookupListener.resultChanged(ServerRegistry.java:111)
        at org.openide.util.lookup.AbstractLookup$NotifyListeners.run(AbstractLookup.java:525)
        at org.openide.loaders.FolderLookup$Dispatch.run(FolderLookup.java:304)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:576)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1013)

Found 1 deadlock.