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
return true;
			}
		}
		return false;
	}
	public synchronized Object getParent(Object anElement) {
		Set extensions = contentService.findContentExtensionsWithPossibleChild(anElement);
		Object parent;
		NavigatorContentExtension foundExtension;
		NavigatorContentExtension[] overridingExtensions;
		for (Iterator itr = extensions.iterator(); itr.hasNext();) {
			foundExtension = (NavigatorContentExtension) itr.next();
			try {
				if (!isOverridingExtensionInSet(foundExtension.getDescriptor(), extensions)) {
					parent = foundExtension.internalGetContentProvider().getParent(anElement);
					overridingExtensions = foundExtension.getOverridingExtensionsForPossibleChild(anElement);
					if (overridingExtensions.length > 0) {
						parent = pipelineParent(anElement, overridingExtensions, parent);
					}
					if (parent != null) {
						return parent;
					}
				}
			} catch (Throwable e) {
				NavigatorPlugin.logError(0, NLS.bind(CommonNavigatorMessages.Exception_Invoking_Extension,
						new Object[] { foundExtension.getDescriptor().getId(), anElement }), e);
			}
		}
		return null;
	}