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Deadlock starting launch group multiple times #2846

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Deadlock starting launch group multiple times#2846
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@iloveeclipse
iloveeclipse
opened on Jul 31, 2026

I've started a launch group multiple times quickly and UI froze.
Jstack shows classic deadlock.

Found one Java-level deadlock:
=============================
"main":
  waiting to lock monitor 0x00007f3bec096b90 (object 0x00000000873f54a0, a java.util.HashMap),
  which is held by "Worker-25: Launching Many_Ants"

"Worker-25: Launching Many_Ants":
  waiting to lock monitor 0x00007f3bc800af30 (object 0x00000007ff4e4a48, a java.util.HashMap),
  which is held by "Worker-10: Launching Many_Ants"

"Worker-10: Launching Many_Ants":
  waiting to lock monitor 0x00007f3bec096b90 (object 0x00000000873f54a0, a java.util.HashMap),
  which is held by "Worker-25: Launching Many_Ants"

Java stack information for the threads listed above:
===================================================
"main":
        at org.eclipse.debug.internal.core.groups.GroupLaunch.isTerminated(GroupLaunch.java:98)
        - waiting to lock <0x00000000873f54a0> (a java.util.HashMap)
        at org.eclipse.debug.internal.ui.actions.RemoveAllTerminatedAction.isEnabled(RemoveAllTerminatedAction.java:37)
        at org.eclipse.debug.internal.ui.actions.AbstractRemoveAllActionDelegate.update(AbstractRemoveAllActionDelegate.java:93)
        at org.eclipse.debug.internal.ui.actions.AbstractRemoveAllActionDelegate.init(AbstractRemoveAllActionDelegate.java:73)
        at org.eclipse.ui.internal.ViewPluginAction.initDelegate(ViewPluginAction.java:52)
        at org.eclipse.ui.internal.PluginAction.createDelegate(PluginAction.java:128)
        at org.eclipse.ui.internal.PluginAction.selectionChanged(PluginAction.java:262)
        at org.eclipse.ui.internal.PartPluginAction.registerSelectionListener(PartPluginAction.java:41)
        at org.eclipse.ui.internal.ViewPluginAction.<init>(ViewPluginAction.java:38)
        at org.eclipse.ui.internal.ActionDescriptor.createAction(ActionDescriptor.java:262)
        at org.eclipse.ui.internal.ActionDescriptor.<init>(ActionDescriptor.java:177)
        at org.eclipse.ui.internal.ViewerActionBuilder.createActionDescriptor(ViewerActionBuilder.java:49)
        at org.eclipse.ui.internal.PluginActionBuilder.readElement(PluginActionBuilder.java:160)
        at org.eclipse.ui.internal.ViewerActionBuilder.readElement(ViewerActionBuilder.java:81)
        at org.eclipse.ui.internal.registry.RegistryReader.readElements(RegistryReader.java:123)
        at org.eclipse.ui.internal.registry.RegistryReader.readElementChildren(RegistryReader.java:112)
        at org.eclipse.ui.internal.PluginActionBuilder.readElement(PluginActionBuilder.java:143)
        at org.eclipse.ui.internal.ViewerActionBuilder.readElement(ViewerActionBuilder.java:81)
        at org.eclipse.ui.internal.registry.RegistryReader.readElements(RegistryReader.java:123)
        at org.eclipse.ui.internal.registry.RegistryReader.readExtension(RegistryReader.java:133)
        at org.eclipse.ui.internal.registry.RegistryReader.readRegistry(RegistryReader.java:152)
        at org.eclipse.ui.internal.PluginActionBuilder.readContributions(PluginActionBuilder.java:114)
        at org.eclipse.ui.internal.ViewerActionBuilder.readViewerContributions(ViewerActionBuilder.java:98)
        at org.eclipse.ui.internal.PopupMenuExtender.readStaticActionsFor(PopupMenuExtender.java:491)
        at org.eclipse.ui.internal.PopupMenuExtender.addMenuId(PopupMenuExtender.java:229)
        at org.eclipse.ui.internal.PopupMenuExtender.<init>(PopupMenuExtender.java:149)
        at org.eclipse.ui.internal.PartSite.registerContextMenu(PartSite.java:125)
        at org.eclipse.ui.part.PageSite.registerContextMenu(PageSite.java:221)
        at org.eclipse.ui.console.TextConsolePage.createControl(TextConsolePage.java:166)
        at org.eclipse.ui.internal.console.IOConsolePage.createControl(IOConsolePage.java:59)
        at org.eclipse.ui.internal.console.ConsoleView.doCreatePage(ConsoleView.java:388)
        at org.eclipse.ui.part.PageBookView.createPage(PageBookView.java:369)
        at org.eclipse.ui.part.PageBookView.partActivated(PageBookView.java:693)
        at org.eclipse.ui.internal.console.ConsoleView.lambda$0(ConsoleView.java:479)
        at org.eclipse.ui.internal.console.ConsoleView$$Lambda/0x0000000035a32e38.run(Unknown Source)
        at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:40)
        at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:131)
        - locked <0x00000000c4efb378> (a org.eclipse.swt.widgets.RunnableLock)
        at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:5078)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:4534)
        at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1160)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
        at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1051)
        at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
        at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
        at org.eclipse.ui.internal.Workbench$$Lambda/0x0000000035197620.run(Unknown Source)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
        at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:583)
        at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:193)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:219)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:149)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:115)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:467)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:298)
        at java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(java.base@25/DirectMethodHandle$Holder)
        at java.lang.invoke.LambdaForm$MH/0x000000003504f800.invoke(java.base@25/LambdaForm$MH)
        at java.lang.invoke.LambdaForm$MH/0x000000003504fc00.invokeExact_MT(java.base@25/LambdaForm$MH)
        at jdk.internal.reflect.DirectMethodHandleAccessor.invokeImpl(java.base@25/DirectMethodHandleAccessor.java:156)
        at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(java.base@25/DirectMethodHandleAccessor.java:104)
        at java.lang.reflect.Method.invoke(java.base@25/Method.java:565)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:615)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:563)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1415)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1387)
"Worker-25: Launching Many_Ants":
        at org.eclipse.debug.internal.core.groups.GroupLaunch.launchChanged(GroupLaunch.java:203)
        - waiting to lock <0x00000007ff4e4a48> (a java.util.HashMap)
        at org.eclipse.debug.internal.core.LaunchManager$LaunchNotifier.run(LaunchManager.java:426)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
        at org.eclipse.debug.internal.core.LaunchManager$LaunchNotifier.notify(LaunchManager.java:409)
        at org.eclipse.debug.internal.core.LaunchManager.fireUpdate(LaunchManager.java:919)
        at org.eclipse.debug.core.Launch.fireChanged(Launch.java:471)
        at org.eclipse.debug.core.Launch.addProcess(Launch.java:425)
        at org.eclipse.debug.internal.core.groups.GroupLaunch.launchChanged(GroupLaunch.java:218)
        - locked <0x00000000873f54a0> (a java.util.HashMap)
        at org.eclipse.debug.internal.core.groups.GroupLaunchConfigurationDelegate.launchChild(GroupLaunchConfigurationDelegate.java:175)
        at org.eclipse.debug.internal.core.groups.GroupLaunchConfigurationDelegate.launch(GroupLaunchConfigurationDelegate.java:127)
        at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:790)
        at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:701)
        at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1051)
        at org.eclipse.debug.internal.ui.DebugUIPlugin$1.run(DebugUIPlugin.java:1253)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)
"Worker-10: Launching Many_Ants":
        at org.eclipse.debug.internal.core.groups.GroupLaunch.launchChanged(GroupLaunch.java:203)
        - waiting to lock <0x00000000873f54a0> (a java.util.HashMap)
        at org.eclipse.debug.internal.core.LaunchManager$LaunchNotifier.run(LaunchManager.java:426)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
        at org.eclipse.debug.internal.core.LaunchManager$LaunchNotifier.notify(LaunchManager.java:409)
        at org.eclipse.debug.internal.core.LaunchManager.fireUpdate(LaunchManager.java:919)
        at org.eclipse.debug.core.Launch.fireChanged(Launch.java:471)
        at org.eclipse.debug.core.Launch.addProcess(Launch.java:425)
        at org.eclipse.debug.internal.core.groups.GroupLaunch.launchChanged(GroupLaunch.java:218)
        - locked <0x00000007ff4e4a48> (a java.util.HashMap)
        at org.eclipse.debug.internal.core.groups.GroupLaunchConfigurationDelegate.launchChild(GroupLaunchConfigurationDelegate.java:175)
        at org.eclipse.debug.internal.core.groups.GroupLaunchConfigurationDelegate.launch(GroupLaunchConfigurationDelegate.java:127)
        at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:790)
        at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:701)
        at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:1051)
        at org.eclipse.debug.internal.ui.DebugUIPlugin$1.run(DebugUIPlugin.java:1253)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

Found 1 deadlock.

Activity

  1. iloveeclipse
    added
    bugSomething isn't working
    on Jul 31, 2026

  2. iloveeclipse commented on Jul 31, 2026

    @iloveeclipse
    iloveeclipse
    on Jul 31, 2026
    MemberAuthor

    This is the launch config group which just runs "usual" Java launch config that calls trivial Java class printing something to console.
    Starting this group few times produces deadlock.

    <?xml version="1.0" encoding="UTF-8" standalone="no"?>
<launchConfiguration type="org.eclipse.debug.core.groups.GroupLaunchConfigurationType">
    <stringAttribute key="org.eclipse.debug.core.launchGroup.0.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.0.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.0.enabled" value="true"/>
    <stringAttribute key="org.eclipse.debug.core.launchGroup.0.mode" value="debug"/>
    <stringAttribute key="org.eclipse.debug.core.launchGroup.0.name" value="PrintSomething"/>
    
    <stringAttribute key="org.eclipse.debug.core.launchGroup.1.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.1.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.1.enabled" value="true"/>
    <stringAttribute key="org.eclipse.debug.core.launchGroup.1.mode" value="run"/>
    <stringAttribute key="org.eclipse.debug.core.launchGroup.1.name" value="A build2.xml"/>
    
    <stringAttribute key="org.eclipse.debug.core.launchGroup.2.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.2.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.2.enabled" value="true"/>
    <stringAttribute key="org.eclipse.debug.core.launchGroup.2.mode" value="run"/>
    <stringAttribute key="org.eclipse.debug.core.launchGroup.2.name" value="A build2.xml"/>
    
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.3.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.3.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.3.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.3.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.3.name" value="PrintSomething"/>
    
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.4.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.4.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.4.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.4.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.4.name" value="PrintSomething"/>
    
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.5.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.5.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.5.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.5.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.5.name" value="PrintSomething"/>
    
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.6.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.6.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.6.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.6.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.6.name" value="PrintSomething"/>
    
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.7.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.7.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.7.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.7.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.7.name" value="PrintSomething"/>
    
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.8.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.8.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.8.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.8.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.8.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.9.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.9.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.9.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.9.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.9.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.10.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.10.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.10.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.10.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.10.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.11.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.11.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.11.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.11.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.11.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.12.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.12.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.12.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.12.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.12.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.13.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.13.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.13.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.13.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.13.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.14.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.14.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.14.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.14.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.14.name" value="PrintSomething"/>

    <stringAttribute  key="org.eclipse.debug.core.launchGroup.15.action" value="NONE"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.15.adoptIfRunning" value="false"/>
    <booleanAttribute key="org.eclipse.debug.core.launchGroup.15.enabled" value="true"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.15.mode" value="inherit"/>
    <stringAttribute  key="org.eclipse.debug.core.launchGroup.15.name" value="PrintSomething"/>    
</launchConfiguration>
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