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
}
			} catch (Throwable e) {
				NavigatorPlugin.logError(0, NLS.bind(CommonNavigatorMessages.Exception_Invoking_Extension,
						new Object[] { foundExtension.getDescriptor().getId(), anElement }), e);
			}
		}
		return parents;
	}
	private Object findParent(NavigatorContentExtension anExtension, Object anElement, Object aSuggestedParent) {
		
		Object lastValidParent = aSuggestedParent;
		
		Object suggestedOverriddenParent = null;
		IPipelinedTreeContentProvider piplineContentProvider;
		NavigatorContentExtension[] overridingExtensions = anExtension
				.getOverridingExtensionsForPossibleChild(anElement);
		for (int i = 0; i < overridingExtensions.length; i++) {
			if (overridingExtensions[i].internalGetContentProvider().isPipelined()) {
				piplineContentProvider = (IPipelinedTreeContentProvider) overridingExtensions[i].internalGetContentProvider();
				suggestedOverriddenParent = piplineContentProvider.getPipelinedParent(anElement, lastValidParent);
				if (suggestedOverriddenParent != null)
					lastValidParent = suggestedOverriddenParent;
				
				lastValidParent = findParent(overridingExtensions[i], anElement, lastValidParent);
			}
		}
		return lastValidParent;
	}
}