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Created attachment 152554 [details] full thread dump #1 I was working on a multy-platform fs_server project. When I right-clicked the project, there was a long UI freeze (it was long enough for me to switch to console, call "pgrep java" and call "jstack $JAVA_PID" two times) The EDT stack is: "AWT-EventQueue-0" prio=10 tid=0x00007f7af00d7000 nid=0x6f2d waiting for monitor entry [0x00007f7b1974e000] java.lang.Thread.State: BLOCKED (on object monitor) at org.netbeans.modules.cnd.toolchain.compilerset.CompilerSetManagerAccessorImpl.getDefaultImpl(CompilerSetManagerAccessorImpl.java:122) - waiting to lock <0x00000007842fffb8> (a java.lang.Object) at org.netbeans.modules.cnd.toolchain.compilerset.CompilerSetManagerAccessorImpl.getDefault(CompilerSetManagerAccessorImpl.java:81) at org.netbeans.modules.cnd.api.toolchain.CompilerSetManager.get(CompilerSetManager.java:69) at org.netbeans.modules.cnd.makeproject.api.configurations.CompilerSet2Configuration.getCompilerSetManager(CompilerSet2Configuration.java:110) at org.netbeans.modules.cnd.makeproject.api.configurations.CompilerSet2Configuration.getCompilerSet(CompilerSet2Configuration.java:169) at org.netbeans.modules.cnd.debugger.common2.DbgActionHandlerFactory.canHandle(DbgActionHandlerFactory.java:69) at org.netbeans.modules.cnd.makeproject.api.ProjectActionSupport.canHandle(ProjectActionSupport.java:240) at org.netbeans.modules.cnd.makeproject.api.configurations.MakeConfiguration.hasDebugger(MakeConfiguration.java:1141) at org.netbeans.modules.cnd.makeproject.MakeActionProvider.isActionEnabled(MakeActionProvider.java:1404) at org.netbeans.modules.project.ui.actions.ActionsUtil.commandSupported(ActionsUtil.java:185) at org.netbeans.modules.project.ui.actions.ActionsUtil.getProjectsFromLookup(ActionsUtil.java:102) at org.netbeans.modules.project.ui.actions.ProjectAction$3.run(ProjectAction.java:213) at org.netbeans.modules.project.ui.actions.ProjectAction.refresh(ProjectAction.java:241) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.doRefresh(LookupSensitiveAction.java:197) at org.netbeans.modules.project.ui.actions.LookupSensitiveAction.getValue(LookupSensitiveAction.java:129) at org.netbeans.modules.project.ui.actions.ProjectAction.getValue(ProjectAction.java:75) at javax.swing.AbstractButton.setMnemonicFromAction(AbstractButton.java:1256) at javax.swing.AbstractButton.configurePropertiesFromAction(AbstractButton.java:1160) at javax.swing.JMenuItem.configurePropertiesFromAction(JMenuItem.java:376) at javax.swing.AbstractButton.setAction(AbstractButton.java:1107) at javax.swing.JMenu.add(JMenu.java:630) at org.netbeans.modules.cnd.makeproject.launchers.actions.LauncherAction.createSubMenu(LauncherAction.java:131) at org.netbeans.modules.cnd.makeproject.launchers.actions.LauncherAction.createMenuItem(LauncherAction.java:86) at org.netbeans.modules.cnd.makeproject.launchers.actions.LauncherAction.getPopupPresenter(LauncherAction.java:76) at org.openide.util.Utilities.actionsToPopup(Utilities.java:1729) at org.openide.util.Utilities.actionsToPopup(Utilities.java:1815) at org.openide.explorer.view.TreeView.createPopup(TreeView.java:1058) at org.openide.explorer.view.TreeView$PopupAdapter.showPopup(TreeView.java:1555) at org.openide.awt.MouseUtils$PopupMouseAdapter.maybePopup(MouseUtils.java:189) Full stacks are in attachments
Created attachment 152555 [details] full thread dump #2
Steps to reproduce (I'm not sure if the steps 3 and 4 are needed, i used this workflow for easier debugging process): 1) Create a remote project with existing sources Use a host with very slow FS, or mimic it by inserting a breakpoint to CompilerSetManagerAccessorImpl.java:101 (setManagers(), CompilerSetPreferences.saveToDisk(impl)) 2) Add some launchers to this project 2) Services | Remove Host (for the created project) 3) Services | Add New Host ------------------ AddHostAction thread freezes with MASTER_LOCK ------------------ 4) Right click on the project ------------------ AWT thread freezes with stack from Comment #1 (Waiting for MASTER_LOCK) ------------------ UI is frozen until changes are saved (CompilerSetPreferences.saveToDisk)
Note: Expanding the "Debug" menu on the top of the IDE will cause all this work (checking if isActionEnabled is true) is also done, but in the separate thread "LookupSensitiveAction". Thus, UI isn't frozen in this case.