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For details about this issue see issue #151498. java.lang.IllegalStateException: Should not acquire Children.MUTEX while holding ProjectManager.mutex() at org.openide.nodes.Children$ProjectManagerDeadlockDetector.execute(Children.java:1809) at org.openide.util.Mutex.postRequest(Mutex.java:1245) at org.openide.util.Mutex.postRequest(Mutex.java:1209) at org.openide.util.Mutex.postWriteRequest(Mutex.java:582) at org.openide.nodes.Children$Keys.applyKeys(Children.java:1514) at org.openide.nodes.Children$Keys.setKeys(Children.java:1458) at org.netbeans.modules.cnd.makeproject.ui.MakeLogicalViewProvider$BaseMakeViewChildren.stateChanged(MakeLogicalViewProvider.java:1489) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.fireChangeEvent(Folder.java:910) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.fireChangeEvent(Folder.java:899) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.addElement(Folder.java:410) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.addFolder(Folder.java:473) at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfigurationDescriptor.addSourceFilesFromFolder(MakeConfigurationDescriptor.java:1112) at org.netbeans.modules.cnd.makeproject.api.configurations.Folder.fileFolderCreated(Folder.java:965) at org.openide.filesystems.FileUtil$Holder.fileFolderCreated(FileUtil.java:475) at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:139) at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:125) at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:102) at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1071) at org.openide.filesystems.FileSystem$EventDispatcher.run(FileSystem.java:912) at org.openide.filesystems.EventControl.dispatchEvent(EventControl.java:79) at org.openide.filesystems.FileSystem.dispatchEvent(FileSystem.java:574) at org.openide.filesystems.FileObject.dispatchEvent(FileObject.java:526) ...
Fixed in http://hg.netbeans.org/cnd-main/rev/0b6c9c2cec5f (followed the java.project fix from issue 175997) Could not reproduce the original issue, so could not verify the fix either.