调试dump文件，加载相匹配版本的sos/clr时，绝大多数都是可以正常使用的。
然而凡事都有例外，今天在做类似工作时，遇到了错误：
CLRDLL: Consider using ".cordll -lp
Failed to load data access DLL, 0x80004005
再次指定mscordacwks.dll所在路径，问题解决。
To debug a managed application, the debugger must load a data access component (DAC) that corresponds to the CLR that the application has loaded. However, in some cases, the application loads more than one CLR. In that case, you can use the I parameter to specify which DAC the debugger should load. Version 2 of the CLR is named Mscorwks.dll, and version 4 of the CLR is named Clr.dll. The following example shows how to specify that the debugger should load the DAC for version 2 (mscorwks).
https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/-cordll--control-clr-debugging-
************* Path validation summary ************** Response Time (ms) Location Deferred SRV*C:\Symbols*http://msdl.microsoft.com/download/symbols Symbol search path is: SRV*C:\Symbols*http://msdl.microsoft.com/download/symbols Executable search path is: Windows 7 Version 7601 (Service Pack 1) MP (8 procs) Free x64 Product: Server, suite: TerminalServer SingleUserTS Machine Name: Debug session time: Fri Dec 29 11:43:54.000 2017 (UTC + 8:00) System Uptime: 7 days 17:13:43.569 Process Uptime: 0 days 0:32:30.000 ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ................................................................ ............... ntdll!ZwWaitForSingleObject+0xa: 00000000`779abd7a c3 ret 0:000> lmvm clr
Browse full module list
start end module name
000007fe`fa120000 000007fe`faa85000 clr (deferred)
Image path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll
Image name: clr.dll
Browse all global symbols functions data
Timestamp: Wed Mar 30 16:43:27 2011 (4D92ED2F)
CheckSum: 00966902
ImageSize: 00965000
File version: 4.0.30319.233
Product version: 4.0.30319.233
File flags: 8 (Mask 3F) Private
File OS: 4 Unknown Win32
File type: 2.0 Dll
File date: 00000000.00000000
Translations: 0409.04b0
CompanyName: Microsoft Corporation
ProductName: Microsoft® .NET Framework
InternalName: clr.dll
OriginalFilename: clr.dll
ProductVersion: 4.0.30319.233
FileVersion: 4.0.30319.233 (RTMGDR.030319-2300)
PrivateBuild: DDBLD457
FileDescription: Microsoft .NET Runtime Common Language Runtime - WorkStation
LegalCopyright: © Microsoft Corporation. All rights reserved.
Comments: Flavor=Retail
0:000> .load D:\dumps\dotNet_dlls\00__233\x64\sos.dll
0:000> !tp CLRDLL: Consider using ".cordll -lp" command to specify .NET runtime directory. Failed to load data access DLL, 0x80004005 Verify that 1) you have a recent build of the debugger (6.2.14 or newer) 2) the file mscordacwks.dll that matches your version of clr.dll is in the version directory 3) or, if you are debugging a dump file, verify that the file mscordacwks_ _ _ .dll is on your symbol path. 4) you are debugging on the same architecture as the dump file. For example, an IA64 dump file must be debugged on an IA64 machine. You can also run the debugger command .cordll to control the debugger's load of mscordacwks.dll. .cordll -ve -u -l will do a verbose reload. If that succeeds, the SOS command should work on retry. If you are debugging a minidump, you need to make sure that your executable path is pointing to clr.dll as well. 0:000> .cordll -ve -u -l CLRDLL: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscordacwks.dll:4.7.2115.00 f:8 doesn't match desired version 4.0.30319.233 f:8 CLRDLL: Unable to find mscordacwks_AMD64_AMD64_4.0.30319.233.dll by mscorwks search CLRDLL: Unable to find 'mscordacwks_AMD64_AMD64_4.0.30319.233.dll' on the path CLRDLL: Unable to find clr.dll by search Cannot Automatically load SOS CLRDLL: ERROR: Unable to load DLL mscordacwks_AMD64_AMD64_4.0.30319.233.dll, Win32 error 0n2 CLRDLL: Consider using ".cordll -lp " command to specify .NET runtime directory. CLR DLL status: ERROR: Unable to load DLL mscordacwks_AMD64_AMD64_4.0.30319.233.dll, Win32 error 0n2 0:000> .cordll -lp D:\dumps\dotNet_dlls\00__233\x64\
CLRDLL: Loaded DLL D:\dumps\dotNet_dlls\00__233\x64\mscordacwks.dll
Automatically loaded SOS Extension
CLR DLL status: Loaded DLL D:\dumps\dotNet_dlls\00__233\x64\mscordacwks.dll
0:000> !tp
CPU utilization: 83%
Worker Thread: Total: 16 Running: 13 Idle: 0 MaxLimit: 800 MinLimit: 8
Work Request in Queue: 8
Unknown Function: 000007fefad52da0 Context: 000000000c2544b0
Unknown Function: 000007fefad52da0 Context: 000000000c2690e0
AsyncTimerCallbackCompletion TimerInfo@0000000007f14740
Unknown Function: 000007fefad52da0 Context: 000000000c257ea0
Unknown Function: 000007fefad52da0 Context: 000000000c257f00
Unknown Function: 000007fefad52da0 Context: 000000000c257e40
Unknown Function: 000007fefad52da0 Context: 000000000c268ea0
Unknown Function: 000007fefad52da0 Context: 000000000c257fc0
--------------------------------------
Number of Timers: 56
--------------------------------------
Completion Port Thread:Total: 3 Free: 3 MaxFree: 16 CurrentLimit: 3 MaxLimit: 800 MinLimit: 8