我正在尝试从转储中追踪NullReferenceException. NullReferenceException不是崩溃异常,而是崩溃异常是TargetInvocationException,其InnerException是NullReferenceException.

我正在使用Windbg和SOS,我使用命令analyze -v,这给了我NullReferenceException的调用堆栈：

EXCEPTION_OBJECT: !pe f6cb150
Exception object: 000000000f6cb150
Exception type:   System.NullReferenceException
Message:          Object reference not set to an instance of an object.
InnerException:   <none>
StackTrace (generated):
SP               IP               Function
000000002CD9D8C0 000007FF01E7C639 MyDll!DoSomething2()+0xe99
000000002CD9DBE0 000007FF01E7B11D MyDll!DoSomething1()+0x43d
000000002CD9DD20 000007FF01E7AB11 MyDll!WorkerDoWork(System.Object,System.ComponentModel.DoWorkEventArgs)+0x51
000000002CD9DD80 000007FEEA68A0F2 System_ni!System.ComponentModel.BackgroundWorker.WorkerThreadStart(System.Object)+0x62

请注意,我得到了具有字节偏移的方法名称,但没有行号. DoSomething2是一个很大的函数,因此NullReferenceException发生的位置并不明显.

我试图按照Tess Ferrandez博客中的说明操作：

.Net exceptions – Tracking down where in the code the exceptions occurred

但是我很早就陷入困境,我尝试使用DoSomething2：7FF01E7C639的IP来确定方法DoSomething2的方法描述符！ip2md：

> !ip2md 7FF01E7C639
Failed to request MethodData,not in JIT code range

请注意,！ip2md命令在发生TargetInvocationException的方法的IP上成功.

题：

我在哪里可以从这里开始缩小DoSomething2中的哪一行崩溃？
请注意,我无法重现崩溃,所以我只有这个(和几个重复的)转储.

补充说明：

> .NET 4.0
> Windbg版本：6.12.0002.633 AMD64
>我是Windbg的新手：所以信息越多越好

编辑1

如果我没有正确设置符号,我会得到以下信息：

STACK_TEXT:  
00000000`2cd9d8c0 00000000`ffffffff MyDll!Unknown_0xe99+0xe99
00000000`2cd9dbe0 00000000`ffffffff MyDll!Unknown_0x43d+0x43d
00000000`2cd9dd20 00000000`ffffffff MyDll!Unknown_0x51+0x51
00000000`2cd9dd80 00000000`ffffffff system_ni!    System.ComponentModel.BackgroundWorker.WorkerThreadStart+0x62

当我将其设置为指向我的符号服务器并打开！sym noisy时,它似乎正确加载符号：

0:000> ld MyDll
DBGHELP: C:\Program Files\Debugging Tools for Windows (x64)\MyDll.dll - file not found
SYMSRV:  c:\symbols\MyDll.dll\4F3D6F4B154000\MyDll.dll not found
SYMSRV:  http://msdl.microsoft.com/download/symbols/MyDll.dll/4F3D6F4B154000/MyDll.dll not found
SYMSRV:  \\mysymbolserver\store\Mydll.dll\4F3D6F4B154000\file.ptr
SYMSRV:  MyDll.dl_ from \\mysymbolserver\store: uncompressed
DBGHELP: c:\symbols\MyDll.dll\4F3D6F4B154000\MyDll.dll - OK
DBGENG:  c:\symbols\MyDll.dll\4F3D6F4B154000\MyDll.dll - Mapped image memory
SYMSRV:  c:\symbols\MyDll.pdb\8AFC2BE7529A41289FA9FBCEDB6836161\Mydll.pdb not found
SYMSRV:  http://msdl.microsoft.com/download/symbols/Mydll.pdb/8AFC2BE7529A41289FA9FBCEDB6836161/MyDll.pdb not found
SYMSRV:  \\mysymbolserver\store\MyDll.pdb\8AFC2BE7529A41289FA9FBCEDB6836161\file.ptr
SYMSRV:  MyDll.pd_ from \\mysymbolserver\store: uncompressed
DBGHELP: MyDll - private symbols & lines 
     c:\symbols\MyDll.pdb\8AFC2BE7529A41289FA9FBCEDB6836161\MyDll.pdb
Symbols loaded for MyDll

编辑2

我尝试使用！name2ee如下：

0:000> !name2ee MyDll!MyType.DoSomething2
Module:      000007ff004995b8
Assembly:    Autodesk.DataManagement.Client.Framework.Vault.dll
<invalid module token>

所以,那里没有运气.但后来我几乎似乎得到了这个：

0:000> !name2ee MyDll.dll!MyNamespace.MyType
Module:      000007ff004995b8
Assembly:    MyDll.dll
Token:       000000000200008c
MethodTable: 000007ff01b2e258
EEClass:     000007ff01b415e0
Name:        MyNamespace.MyType

0:000> !dumpmt -md 7ff01b2e258
EEClass:      000007ff01b415e0
Module:       000007ff004995b8
Name:         MyNamspace.MyType
mdToken:      000000000200008c
File:         C:\Program Files\MyCompany\MyProduct\Bin\MyDll.dll
BaseSize:        0x30
ComponentSize:   0x0
Slots in VTable: 31
Number of IFaces in IFaceMap: 2
--------------------------------------
MethodDesc Table
           Entry       MethodDesc      JIT Name
000007feeb31a2c0 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007feeb3689f0 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007feeb3688c0 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007feeb353440 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01b01300 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01e89140 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01b9c080 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01f45f40 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01a9b358 000007ff01b2e128     NONE MyType.DoSomething3()
000007ff01a9b360 000007ff01b2e130     NONE MyType.DoSomething4()
000007ff01a9b368 000007ff01b2e138     NONE MyType.DoSomething5()
000007ff01e79800 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff020fea80 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01a9b3b0 000007ff01b2e1b0     NONE MyType.DoSomething6()
000007ff01a9b3b8 000007ff01b2e1b8     NONE MyType.DoSomething7()
000007ff01a9b328 000007ff01b2e0f0     NONE MyType..ctor()
000007ff01b01280 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01e7a810 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01e7aac0 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01e83240 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01f19520 000007ff01b2e178      JIT MyType.RunWorkerCompleted(System.Object,System.ComponentModel.RunWorkerCompletedEventArgs)
000007ff01e7ace0 0000000000000000      JIT 0000000000000000 is not a MethodDesc
000007ff01e7b7a0 0000000000000000      JIT 0000000000000000 is not a MethodDesc
000007ff01e7b710 0000000000000000      JIT 0000000000000000 is not a MethodDesc
000007ff01e7d2b0 0000000000000000      JIT 0000000000000000 is not a MethodDesc
000007ff01b015f0 0000000000000000      JIT 0000000000000000 is not a MethodDesc
000007ff01b88ce0 0000000000000000      JIT 0000000000000000 is not a MethodDesc
000007ff01a9b3e0 000007ff01b2e200     NONE MyType.DoSomething8()
000007ff01b921e0 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01b933b0 0000000000000000     NONE 0000000000000000 is not a MethodDesc
000007ff01b93870 0000000000000000     NONE 0000000000000000 is not a MethodDesc

我猜测所有缺失的条目(那些列出的“不是MethodDesc”)是由于这不是一个完整的迷你转储.是对的吗？