Bug 307405 [CommonNavigator] Deadlock in NavigatorContentServiceContentProvider
We are using an adopting product and one of our users encountered this deadlock when starting up their workspace: 1LKDEADLOCK Deadlock detected !!! NULL --------------------- NULL 2LKDEADLOCKTHR Thread "main" (0x41591300) 3LKDEADLOCKWTR is waiting for: 4LKDEADLOCKMON sys_mon_t:0x43134548 infl_mon_t: 0x43134580: 4LKDEADLOCKOBJ org/eclipse/ui/internal/navigator/NavigatorSaveablesService@0x05DB48A8/0x05DB48B4: 3LKDEADLOCKOWN which is owned by: 2LKDEADLOCKTHR Thread "Framework Event Dispatcher" (0x42467700) 3LKDEADLOCKWTR which is waiting for: 4LKDEADLOCKMON sys_mon_t:0x43BA6AB8 infl_mon_t: 0x43BA6AF0: 4LKDEADLOCKOBJ org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider@0x0306F6E8/0x0306F6F4: 3LKDEADLOCKOWN which is owned by: 2LKDEADLOCKTHR Thread "main" (0x41591300) I will attach the stack trace.
bundles/org.eclipse.ui.navigator/src/org/eclipse/ui/internal/navigator/NavigatorContentServiceContentProvider.java
if (!ext.isLoaded() && !enforceHasChildren)
				return true;
			NavigatorContentExtension[] overridingExtensions;
			if (!isOverridingExtensionInSet(ext.getDescriptor(), enabledExtensions)) {
				try {
					SafeDelegateTreeContentProvider cp = ext.internalGetContentProvider();
					suggestedHasChildren |= callNormalHasChildren(anElementOrPath, anElement, cp);
					overridingExtensions = ext.getOverridingExtensionsForTriggerPoint(anElement);
					if (overridingExtensions.length > 0) {
						suggestedHasChildren = pipelineHasChildren(anElementOrPath, anElement, overridingExtensions,
								suggestedHasChildren);
					}
					if (suggestedHasChildren)
						return true;
				} catch (Throwable e) {
					NavigatorPlugin.logError(0, NLS.bind(
							CommonNavigatorMessages.Exception_Invoking_Extension, new Object[] {
									ext.getDescriptor().getId(), anElementOrPath }), e);
				}
			}
		}
		return suggestedHasChildren;
	}
	public synchronized boolean hasChildren(TreePath path) {
		return hasChildren((Object)path);
	}
	private boolean callNormalHasChildren(Object anElementOrPath, Object anElement, SafeDelegateTreeContentProvider cp) {
		if (cp.isTreePath() && anElementOrPath instanceof TreePath) {
			ITreePathContentProvider tpcp = (ITreePathContentProvider) cp;
			return tpcp.hasChildren((TreePath) anElementOrPath);