我们有WCF的问题，我们花了很长时间来诊断，所以我在这里发布他们的情况下，有人有类似的问题（没有find一个参考其他地方）。
我们的进程经常会因下列未处理的exception而崩溃：
System.NullReferenceException: Object reference not set to an instance of an object. at System.ServiceModel.Channels.OverlappedContext.CompleteCallback(UInt32 error, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) System.NullReferenceException: Object reference not set to an instance of an object. at System.Threading.Overlapped.Free(NativeOverlapped* nativeOverlappedPtr) at System.ServiceModel.Channels.OverlappedContext.Free() at System.ServiceModel.Channels.OverlappedContext.FreeOrDefer() at System.ServiceModel.Channels.SocketConnection.Abort(TraceEventType traceEventType, String timeoutErrorString, TransferOperation transferOperation) at System.ServiceModel.Channels.CommunicationPool`2.EndpointConnectionPool.CloseIdleConnection(TItem connection, TimeSpan timeout) at System.ServiceModel.Channels.IdlingCommunicationPool`2.IdleTimeoutEndpointConnectionPool.IdleTimeoutIdleConnectionPool.OnIdle() at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped) at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) System.NullReferenceException: Object reference not set to an instance of an object. at System.Threading.Overlapped.Free(NativeOverlapped* nativeOverlappedPtr) at System.Net.AsyncRequestContext.Dispose(Boolean disposing) at System.Net.RequestContextBase.Finalize() 例外情况通常发生在几个小时后，有时在几分钟后。
奇怪的是，他们只会在安装2013年1月的Windows更新（并卸载它们后离开）后才会显示。
问题原来是IClientChannel 。
我们忘记了使用后的通道，并从终结器线程调用Dispose() 。
我的猜测是，IClientChannel使用非托管资源，必须从创建它们的相同线程释放。
从同一个线程调用Dispose()后，问题就消失了。