c# – 使用WinDBG进行Postmortem调试

我有一个在服务器上运行的WCF服务,偶尔(每月1-2次)它会抛出一个带有信息性消息“Unknown error(0x8005008)”的COMException.当我搜索这个特定的错误时,我只在IIS中创建虚拟目录时遇到问题.并且源代码与在IIS中创建虚拟目录没有任何关系.

DirectoryServiceLib.LdapProvider.Directory - CreatePost - Could not create employee for 195001010000,000000000000: System.Runtime.InteropServices.COMException (0x80005008): Unknown error (0x80005008) at System.DirectoryServices.PropertyValueCollection.PopulateList

当我在WinDBG中捕获Exception以进一步分析时,我已经使用了memorydump.切换到正确的线程后,我执行了！CLRStack命令：

000000001b8ab6d8 000000007708671a [NDirectMethodFrameStandalone: 000000001b8ab6d8] Common.MemoryDump.MiniDumpWriteDump(IntPtr,Int32,IntPtr,MINIDUMP_TYPE,IntPtr)
000000001b8ab680 000007ff002808d8 DomainBoundILStubClass.IL_STUB_PInvoke(IntPtr,IntPtr)
000000001b8ab780 000007ff00280812 Common.MemoryDump.CreateMiniDump(System.String)
000000001b8ab7e0 000007ff0027b218 DirectoryServiceLib.LdapProvider.Directory.CreatePost(System.String,DirectoryServiceLib.Model.Post,DirectoryServiceLib.Model.Presumptions,Services.Common.SourceEnum,System.String)
000000001b8ad6d8 000007fef8816869 [HelperMethodFrame: 000000001b8ad6d8] 
000000001b8ad820 000007feec2b6c6f System.DirectoryServices.PropertyValueCollection.PopulateList()
000000001b8ad860 000007feec225f0f System.DirectoryServices.PropertyValueCollection..ctor(System.DirectoryServices.DirectoryEntry,System.String)
000000001b8ad8a0 000007feec22d023 System.DirectoryServices.PropertyCollection.get_Item(System.String)
000000001b8ad8f0 000007ff00274d34 Common.DirectoryEntryExtension.GetStringAttribute(System.String)
000000001b8ad940 000007ff0027f507 DirectoryServiceLib.LdapProvider.DirectoryPost.Copy(DirectoryServiceLib.LdapProvider.DirectoryPost)
000000001b8ad980 000007ff0027a7cf DirectoryServiceLib.LdapProvider.Directory.CreatePost(System.String,System.String)
000000001b8adbe0 000007ff00279532 DirectoryServiceLib.WCFDirectory.CreatePost(System.String,System.String)
000000001b8adc60 000007ff001f47bd DynamicClass.SyncInvokeCreatePost(System.Object,System.Object[],System.Object[])

我的结论是它在代码调用时失败了
System.DirectoryServices.PropertyCollection.get_Item(System.String).

所以在发出！CLRStack -a之后我得到了这个结果：

000000001b8ad8a0 000007feec22d023 System.DirectoryServices.PropertyCollection.get_Item(System.String)
   PARAMETERS:
      this = <no data>
      propertyName = <no data>
   LOCALS:
      <CLR reg> = 0x0000000001dcef78
      <no data>

我的第一个问题是为什么它没有显示属性名称的数据？我在Windbg上有点新鲜.但是我在= 0x0000000001dcef78上执行了一个dumpobject：

0:013> !do 0x0000000001dcef78
Name:        System.String
MethodTable: 000007fef66d6960
EEClass:     000007fef625eec8
Size:        74(0x4a) bytes
File:        C:WindowsMicrosoft.NetassemblyGAC_64mscorlibv4.0_4.0.0.0__b77a5c561934e089mscorlib.dll
String:      personalprescriptioncode
Fields:
                  MT    Field   Offset                 Type VT     Attr            Value Name
000007fef66dc848  40000ed        8         System.Int32  1 instance               24 m_stringLength
000007fef66db388  40000ee        c          System.Char  1 instance               70 m_firstChar
000007fef66d6960  40000ef       10        System.String  0   shared           static Empty
                                 >> Domain:Value  0000000000174e10:00000000019d1420 000000001a886f50:00000000019d1420 <<

因此,当源代码想要从Active Directory(用于持久层的内容)中获取个人订阅代码时,它就会失败.回顾堆栈时发出Copy方法.
DirectoryServiceLib.LdapProvider.DirectoryPost.Copy(DirectoryServiceLib.LdapProvider.DirectoryPost)

所以查看源代码：

DirectoryPost postInLimbo = DirectoryPostFactory.Instance().GetDirectoryPost(LdapConfigReader.Instance().GetConfigValue("LimboDN"),idGenPerson.ID.UserId);
if (postInLimbo != null)
   newPost.Copy(postInLimbo);

此代码在OU = limbo中查找具有相同UserId的另一个帖子,如果找到一个,则将属性复制到新帖子.在这种情况下确实如此,并且它与个人订阅代码失败.我在OU = Limbo下查看了Active Directory,帖子中存在属性personalprescriptioncode = 31243.

问题1：为什么它没有显示某些PARAMETERS和LOCALS的数据？是否在创建memorydump之前清理了GC.

问题2：我能做些什么才能解决这个问题？

//
// MessageId: E_ADS_BAD_PARAMETER
//
// MessageText:
//
//  One or more input parameters are invalid
//
#define E_ADS_BAD_PARAMETER              _HRESULT_TYPEDEF_(0x80005008L)