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WinDbg调试.NET程序入门

时间:2021-07-01 10:21:17 帮助过:3人阅读

be found. Defaulted to export symbols for ntdll.dll -

如果不配置,使用命令的时候会提示错误,比如:

0:000> .loadby sos clrjit
0:000> !tp
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for clr.dll - 

************* Symbol Loading Error Summary **************
Module name            Error
clr                    PDB not found : e:\appserver\symbols\dll\clr.pdb

e:\appserver 是我的dmp文件所在的目录,它默认是到symbols 子目录去找符号文件去了。

然后,配置下使用此文件的调试环境。
在菜单命令 File->Symbol path... 打开对话框,选择浏览,找到dmp文件所在目录相关的程序文件目录 E:\AppServer ,该目录下面有程序相关的 exe,pdb 文件。

输入下面的命令:

0:000> .sympath+ c:\symbols
Symbol search path is: E:\AppServer;c:\symbols
Expanded Symbol search path is: e:\appserver;c:\symbols
Error: Attempts to access c:\symbols failed: 0x2 - 系统找不到指定的文件。

************* Symbol Path validation summary **************
Response                         Time (ms)     Location
OK                                             E:\问题\AppServer
Error 

这里不用管,这个文件夹后面可以生成。

0:000> .symfix
0:000> .symfix+ c:\symbols
0:000> .sympath
Symbol search path is: srv*
Expanded Symbol search path is: SRV*c:\symbols*http://msdl.microsoft.com/download/symbols

************* Symbol Path validation summary **************
Response                         Time (ms)     Location
Deferred  

这下对了。
执行下 reload命令:

0:000> .reload
................................................................
................................................................
............

接着执行下面:

0:000> .loadby sos clr
0:000> !tp
The version of SOS does not match the version of CLR you are debugging.  Please
load the matching version of SOS for the version of CLR you are debugging.
CLR Version: 4.0.30319.296
SOS Version: 4.6.96.0
Failed to load data access DLL, 0x80004005

这里提示说SOS的版本更CLR不匹配,这里需要找到当时生成Dump文件所在的服务器上的 sos.dll,注意,因为服务器程序是64位的,所以必须在 .Net Framework64 目录去找,同时把 mscordacwks.dll 文件一起拷贝过来(先暂时不用,下面马上会讲到)。

刚才这个命令执行后,我们惊喜的发现,c:\symbols 目录自己创建了,并且下载了 clr.pdb等几个目录,这是再将刚才服务器上拷贝的 sos.dll, mscordacwks.dll ,放到本地机器的 c:\symbols 目录下面。

再次执行这几个命令:

0:000> .reload
................................................................
................................................................
............
0:000> .loadby sos clr
0:000> !tp
The version of SOS does not match the version of CLR you are debugging.  Please
load the matching version of SOS for the version of CLR you are debugging.
CLR Version: 4.0.30319.296
SOS Version: 4.6.96.0
Failed to load data access DLL, 0x80004005

还是报错,看来 sos.dll 没有加载正确,用下面的命令:

0:000> .load c:\symbols\sos.dll
0:000> .loadby sos clr
0:000> !tp

这里load命令必须带SOS.dll的路径。加载了它,然后执行 .loadby sos clr ,表示调试.NET托管程序。

开始漫长的等待,程序窗口提示:

*BUSY*
Downloading symbols for [clr.pdb] /

等到相关的符号文件全部下载完毕,终于出现了久违的成功界面:

CPU utilization: 11%
Worker Thread: Total: 8 Running: 0 Idle: 8 MaxLimit: 32767 MinLimit: 8
Work Request in Queue: 0
--------------------------------------
Number of Timers: 14
--------------------------------------
Completion Port Thread:Total: 1 Free: 1 MaxFree: 16 CurrentLimit: 0 MaxLimit: 1000 MinLimit: 8

4,获取帮助信息

有关WinDbg详细的调试命名,可以参考下面文章:
windbg调试命令
http://www.cnblogs.com/kekec/archive/2012/12/02/2798020.html

或者,你也可以随时用帮助,查看如何使用:

0:000> !help
-------------------------------------------------------------------------------
SOS is a debugger extension DLL designed to aid in the debugging of managed
programs. Functions are listed by category, then roughly in order of
importance. Shortcut names for popular functions are listed in parenthesis.
Type "!help <functionname>" for detailed info on that function. 

Object Inspection                  Examining code and stacks
-----------------------------      -----------------------------
DumpObj (do)                       Threads
DumpArray (da)                     ThreadState
DumpStackObjects (dso)             IP2MD
DumpHeap                           U
DumpVC                             DumpStack
GCRoot                             EEStack
ObjSize                            CLRStack
FinalizeQueue                      GCInfo
PrintException (pe)                EHInfo
TraverseHeap                       BPMD 
                                   COMState

Examining CLR data structures      Diagnostic Utilities
-----------------------------      -----------------------------
DumpDomain                         VerifyHeap
EEHeap                             VerifyObj
Name2EE                            FindRoots
SyncBlk                            HeapStat
DumpMT                             GCWhere
DumpClass                          ListNearObj (lno)
DumpMD                             GCHandles
Token2EE                           GCHandleLeaks
EEVersion                          FinalizeQueue (fq)
DumpModule                         FindAppDomain
ThreadPool                         SaveModule
DumpAssembly                       ProcInfo 
DumpSigElem                        StopOnException (soe)
DumpRuntimeTypes                   DumpLog
DumpSig                            VMMap
RCWCleanupList                     VMStat
DumpIL                             MinidumpMode 
                                   AnalyzeOOM (ao)

Examining the GC history           Other
-----------------------------      -----------------------------
HistInit                           FAQ
HistRoot
HistObj
HistObjFind
HistClear

也可以使用 .help命令,这个不一样,这里列出部分命令:

0:000> .help
. commands:
   .allow_exec_cmds [0|1] - control execution commands
   .allow_image_mapping [0|1] - control on-demand image file mapping
   .apply_dbp [<options>] - add current data breakpoint state to a
                            register context
   .asm [<options>] - set disassembly options
   .asm- [<options>] - clear disassembly options
   .attach <proc> - attach to <proc> at next execution
   .block { <commands> } - brackets a set of commands for nested execution
   .break - break out of the enclosing loop

也可使用.hh命令:
 Use ".hh <command>" or open debugger.chm in the debuggers directory to get
detailed documentation on a command.

OK,有了dump文件生成,调试环境配置,还有帮助命令,现在总算是入门了。

  

 

WinDbg调试.NET程序入门

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