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我们遇到了WCF的问题，这让我们花了很长时间来诊断，所以我在这里发布它们以防有人遇到类似问题（没有在其他地方找到引用）。WCF终结器中的NullReferenceException
我们的流程往往会与下面的未处理的异常崩溃：
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()
异常通常发生几个小时盯着过程后，有时几分钟后。
奇怪的是，他们只会在安装2013年1月Windows更新（并卸载它们后离开）后才会显示。