Download SOS.dll by version number

Question

I got a mini dump that requires SOS.dll 4.0.30319.1008, however the winDBG failed to download the correct dll. The symbol path has already been set to SRV*C:\symcache*http://msdl.microsoft.com/download/symbols

Does anyone know where to download the SOS.dll by providing the version number? I decided to download the dll manually and replace it to the Microsoft.net fold under windows.

Oloughlin

You can get the appropriate version of SOS.dll on the same machine that the dump was created on. You should not replace the version on your machine. Just use .load <path> to load it. If you debug dumps frequently, I recommend keeping a repository of all unique versions of SOS that you come across. – Knew

Answer 1

Update: I published a blog post on how to open snapshots collected on other machines

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Please try to do following steps if you do not have needed SOS & CLR assemblies from target machine:

• .sympath c:\symbols //[setSymPath]
• .symfix+ //[perform a try to download needed assemblies. Would take ages for the first time
• .cordll -ve -u -l // try to load needed assemblies automatically
• .reload // just-in-case

If it does not work [rare case], a set of steps to be performed:

1. SOS an CLR assemblies are included into Microsoft updates, so you need to pull the same update that is installed on the target machine ( where memery dump was captured ). Here is a link to repo : http://www.mskbfiles.com/sos.dll.php
2. Download needed update and unzip it a couple of times [ f.e. you will get 'GDRGDR.cab' and 'QFEGDR.cab' files -> unzip them too ]
3. The resulting folders would have needed assemblies named like: 'clr_dll_amd64' -> should rename to clr.dll
4. You will need to find needed ones ( CPU architecture, bitness matters )
5. You may load it into the Windbg using .load c:\mytempfolder\NDP40-KB2835393-x64\QFEGDR\sos [Only exact assembly match would work]
6. Upon files are loaded, use .reload command just-in-case

Hope this helps =)

Wilful

Answer 2

I have not investigated in full detail, but it seems that WinDbg downloads SOS.dll for a .NET dump if you type !analyze -v. Also, DebugDiag seems to load SOS.dll when you do a dump analysis.

If none of the options works, run Mscordacwkscollector on the machine where the dump was created.

I also maintain an archive of debugging DLLs.

Carrick

Thomas, looks like the archive is down. Was it relocated? I had found it helpful – Supersonic

@JeffreyLeCours: oh, I seem to accidentally have deleted it along with my business. I'll look into this. I've not maintained it for a long time, but sure, it may still be useful, even to me :-) – Carrick