在基于.NET的COM对象的CoCreateInstance期间挂起的应用程序

时间：2016-02-08 20:28:02

标签： c# c++ .net com-interop winforms-interop

我有一个C ++ DLL，它创建了一个在.NET中实现的COM对象的实例。在许多情况下，这样可以正常工作，但在某些情况下，它会挂起应用程序，我看到它停留在下面的调用堆栈中（这只是我的DLL代码级别下面的部分）：

ntdll.dll!_NtAlpcSendWaitReceivePort@32()
rpcrt4.dll!LRPC_CASSOCIATION::AlpcSendWaitReceivePort(unsigned long,struct _PORT_MESSAGE *,struct _ALPC_MESSAGE_ATTRIBUTES *,struct _PORT_MESSAGE *,unsigned long *,struct _ALPC_MESSAGE_ATTRIBUTES *,union _LARGE_INTEGER *)
rpcrt4.dll!LRPC_BASE_CCALL::DoSendReceive(void)
rpcrt4.dll!LRPC_BASE_CCALL::SendReceive(struct _RPC_MESSAGE *)
rpcrt4.dll!_I_RpcSendReceive@4()
rpcrt4.dll!_NdrSendReceive@8()
rpcrt4.dll!@NdrpSendReceive@4()
rpcrt4.dll!_NdrClientCall2()
combase.dll!ServerAllocateOXIDAndOIDs(void * hServer, void * phProcess, unsigned __int64 * poxidServer, unsigned long cOids, unsigned __int64 * aOid, unsigned long * pcOidsAllocated, const tagOXID_INFO * poxidInfo, tagDUALSTRINGARRAY * pdsaStringBindings, tagDUALSTRINGARRAY * pdsaSecurityBindings, unsigned __int64 * pdwOrBindingsID, tagDUALSTRINGARRAY * * ppdsaOrBindings) Line 246
combase.dll!CRpcResolver::ServerRegisterOXID(const tagOXID_INFO & oxidInfo, unsigned __int64 * poxid, unsigned long * pcOidsToAllocate, unsigned __int64 * arNewOidList) Line 1020
combase.dll!OXIDEntry::RegisterOXIDAndOIDs(unsigned long * pcOids, unsigned __int64 * pOids) Line 1631
combase.dll!OXIDEntry::AllocOIDs(unsigned long * pcOidsAlloc, unsigned __int64 * pOidsAlloc, unsigned long cOidsReturn, unsigned __int64 * pOidsReturn)
combase.dll!CComApartment::CallTheResolver() Line 856
combase.dll!CComApartment::InitRemoting() Line 1166
combase.dll!CComApartment::StartServer() Line 1386
combase.dll!InitChannelIfNecessary() Line 1393
combase.dll!ClassicSTAThreadWaitForHandles(unsigned long dwFlags, unsigned long dwTimeout, unsigned long cHandles, void * * pHandles, unsigned long * pdwIndex) Line 34
combase.dll!CoWaitForMultipleHandles(unsigned long dwFlags, unsigned long dwTimeout, unsigned long cHandles, void * * pHandles, unsigned long * lpdwindex)
mscorwks.dll!NT5WaitRoutine(int,unsigned long,int,void * *,int)
mscorwks.dll!MsgWaitHelper(int,void * *,int,unsigned long,int)
mscorwks.dll!Thread::DoAppropriateAptStateWait(int,void * *,int,unsigned long,enum WaitMode)
mscorwks.dll!Thread::DoAppropriateWaitWorker(int,void * *,int,unsigned long,enum WaitMode)
mscorwks.dll!Thread::DoAppropriateWait(int,void * *,int,unsigned long,enum WaitMode,struct PendingSync *)
mscorwks.dll!CLREvent::WaitEx(unsigned long,enum WaitMode,struct PendingSync *)
mscorwks.dll!CLREvent::Wait(unsigned long,int,struct PendingSync *)
mscorwks.dll!CExecutionEngine::WaitForEvent(void *,unsigned long,int)
mscorwks.dll!ClrWaitEvent(void *,unsigned long,int)
mscorwks.dll!FusionSink::Wait(void)
mscorwks.dll!AssemblySink::Wait(void)
mscorwks.dll!FusionBind::RemoteLoad(struct IApplicationContext *,class FusionSink *,struct IAssemblyName *,struct IAssembly *,unsigned short const *,struct IAssembly * *,struct IHostAssembly * *,struct IAssembly * *,int)
mscorwks.dll!FusionBind::LoadAssembly(struct IApplicationContext *,class FusionSink *,struct IAssembly * *,struct IHostAssembly * *,struct IAssembly * *,int)
mscorwks.dll!AssemblySpec::FindAssemblyFile(class AppDomain *,int,struct IAssembly * *,struct IHostAssembly * *,struct IAssembly * *,struct IFusionBindLog * *,enum StackCrawlMark *)
mscorwks.dll!AppDomain::BindAssemblySpec(class AssemblySpec *,int,int,enum StackCrawlMark *)
mscorwks.dll!AssemblySpec::LoadDomainAssembly(enum FileLoadLevel,class Object * *,class Object * *,int,int,int,enum StackCrawlMark *)
mscorwks.dll!AssemblySpec::LoadAssembly(enum FileLoadLevel,class Object * *,class Object * *,int,int,int,enum StackCrawlMark *)
mscorwks.dll!AppDomain::LoadAssemblyHelper(unsigned short const *,unsigned short const *)
mscorwks.dll!AppDomain::LoadCOMClass(struct _GUID,int,int *)
mscorwks.dll!GetTypeForCLSID(struct _GUID const &,int *)
mscorwks.dll!EEDllGetClassObject(struct _GUID const &,struct _GUID const &,void * *)
mscorwks.dll!_InternalDllGetClassObject@12()
mscorwks.dll!_DllGetClassObjectInternal@12()
mscoreei.dll!_DllGetClassObject@12()
combase.dll!CClassCache::CDllPathEntry::GetClassObject(const _GUID & pClsid, const _GUID & pIid, void * * ppv) Line 2691
combase.dll!CClassCache::CDllPathEntry::DllGetClassObject(const _GUID & rclsid, const _GUID & riid, IUnknown * * ppUnk, int fMakeValid) Line 3892
combase.dll!CClassCache::CDllFnPtrMoniker::BindToObjectNoSwitch(const _GUID & riid, void * * ppvResult) Line 4406
combase.dll!CClassCache::GetClassObject(const ACTIVATION_PROPERTIES & ap) Line 5816
combase.dll!CServerContextActivator::CreateInstance(IUnknown * pUnkOuter, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties) Line 999
combase.dll!ActivationPropertiesIn::DelegateCreateInstance(IUnknown * pUnkOuter, IActivationPropertiesOut * * ppActPropsOut) Line 1854
combase.dll!CApartmentActivator::CreateInstance(IUnknown * pUnkOuter, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties) Line 2323
combase.dll!CProcessActivator::CCICallback(unsigned long dwContext, IUnknown * pUnkOuter, ActivationPropertiesIn * pActIn, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties)
combase.dll!CProcessActivator::AttemptActivation(ActivationPropertiesIn * pActIn, IUnknown * pUnkOuter, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties, HRESULT (unsigned long, IUnknown *, ActivationPropertiesIn *, IActivationPropertiesIn *, IActivationPropertiesOut * *) * pfnCtxActCallback, unsigned long dwContext) Line 1673
combase.dll!CProcessActivator::ActivateByContext(ActivationPropertiesIn * pActIn, IUnknown * pUnkOuter, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties, HRESULT (unsigned long, IUnknown *, ActivationPropertiesIn *, IActivationPropertiesIn *, IActivationPropertiesOut * *) * pfnCtxActCallback) Line 1539
combase.dll!CProcessActivator::CreateInstance(IUnknown * pUnkOuter, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties) Line 1417
combase.dll!ActivationPropertiesIn::DelegateCreateInstance(IUnknown * pUnkOuter, IActivationPropertiesOut * * ppActPropsOut) Line 1854
combase.dll!CClientContextActivator::CreateInstance(IUnknown * pUnkOuter, IActivationPropertiesIn * pInActProperties, IActivationPropertiesOut * * ppOutActProperties) Line 713
combase.dll!ActivationPropertiesIn::DelegateCreateInstance(IUnknown * pUnkOuter, IActivationPropertiesOut * * ppActPropsOut)
combase.dll!ICoCreateInstanceEx(const _GUID & OriginalClsid, IUnknown * punkOuter, unsigned long dwClsCtx, _COSERVERINFO * pServerInfo, unsigned long dwCount, unsigned long dwActvFlags, tagMULTI_QI * pResults, ActivationPropertiesIn * pActIn) Line 1645
combase.dll!CComActivator::DoCreateInstance(const _GUID & Clsid, IUnknown * punkOuter, unsigned long dwClsCtx, _COSERVERINFO * pServerInfo, unsigned long dwCount, tagMULTI_QI * pResults, ActivationPropertiesIn * pActIn) Line 376
combase.dll!CoCreateInstance(const _GUID & rclsid, IUnknown * pUnkOuter, unsigned long dwContext, const _GUID & riid, void * * ppv) Line 120

发生悬挂的情况是满足以下所有条件时：

  1. 应用程序在干净的Windows 2012 R2系统上运行，我刚刚运行了一个安装，尝试安装最小的组件集以供应用程序运行。
  2. 在创建无关的COM对象之前，应用程序不会创建和初始化Microsoft_InteropFormTools.InteropToolbox的实例。
  3. 应用程序以无reg方式安装，而不是使用具有更多开销的旧安装程序，并在注册表中注册COM DLL并在GAC中注册.NET DLL，并且可能包含最小安装程序忽略的文件。 / LI>

    如果我更改了第一个条件并在我的本地Windows 7开发计算机而不是干净的Windows 2012服务器上运行，那么问题就不会发生。如果我更改第二个条件以便代码在创建COM对象之前初始化InteropformTools，那么问题也不会发生。如果我更改第三个条件以便使用旧的综合安装程序安装产品，则问题不会发生。

    如何追踪此问题的根源和/或修复此问题？

1 个答案:

答案 0 :(得分：3)

在Microsoft支持和DebugDiag的帮助下，我们确定问题的原因似乎与Loader Lock有关。 Loader Lock在https://msdn.microsoft.com/en-us/library/ms173266(v=vs.120).aspx详细记录，但基本上，某些限制适用于在DllMain范围内运行的代码或静态非托管代码对象的动态初始化，其实例需要在加载DLL时进行动态初始化（因为它们在全球范围内）。解决这个问题的一种方法是告诉C ++编译器应该使用CLR支持编译代码，这样它就不会处理DllMain中的初始化，而是另一个不保留加载器锁的函数。

在我们的代码中，我们有一个全局声明：

CFSCoCultureWrapper cultureWrapper;

其中有一个构造函数在托管COM对象上调用CoCreateInstance，后者又引用了Microsoft.InteropToolbox。将/clr开关应用于该源文件允许加载DLL而不会挂起。

不清楚为什么行为在不同的部署中发生了变化，但是，由于文章链接状态，挂起不一定总是发生，所以这些可能是难以调试的问题。为了说明，在我们遇到问题之前，即使我们的简单测试用例是4级深度加载DLL - EXE加载（LoadLibrary）非托管DLL加载（CoCreateInstance）托管DLL加载Microsoft DLL。我们决定在这些类型的问题中涉及的复杂程度已经足够了解，并且没有进一步理解为什么问题只发生在某些部署中。

简单的回答，不要创建在构造函数期间从非托管代码加载托管代码的对象的全局实例。使用延迟初始化或切换代码文件以使用/clr开关或使用某些方法阻止在DllMain-time初始化期间执行托管代码。我们发现的另一种解决方法是将托管代码切换为使用.NET 4.5而不是2.0。

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