New debugger extension for .NET (PSSCOR2)

Tom just blogged about a new debugger extension called PSSCor2, which is a superset to the SOS.dll extension that ships with the .net framework.

PSSCor2.dll has been around for quite some time at Microsoft, and pretty much everyone debugging .net code with windbg within Microsoft is using this since it contains all the goodness of sos.dll plus a lot of special methods for and other technologies running on top of the .net framework.  The news now is that after a lot of hard work by Tom and Jon Langdon in the CLR team, it is finally released publicly, YAY!!!

You can download it here and Tom promised to write some posts about the new commands so you might want to follow that… I will likely do the same later on as well…

Just to name two of the commands in there that I use a lot:

!dae  (Dumps out all the exceptions on the .net heaps with callstacks)

!aspxpages  (Dumps out all the pages that are currently executing or have been executing recently, along with the thread they are running on, what the timeout is and how long they have been running… excellent stuff)

Have a good one,


Comments (19)

  1. paper1337 says:

    This is awesome. This would have been really useful about three days ago when I was trying to figure out some issues we were having with usercontrols and pages regenerating their class files unexpectedly.

    This has scored a permanent spot in my debugging toolbox.

  2. nativecpp says:

    I am having problem running the downloaded exe (psscor2.exe). It complains that it is not valid win32 app. Any ideas ?

  3. Gregory Suvalian says:

    This appears to be x64 version

  4. jackem says:

    It’s almost sad how excited I am about this.

  5. Tess says:

    The installer seems to be 64bit, but it contains a 32bit, an IA64 and an amd65 (64bit) version of psscor…

    I’ll check in with Tom to let him know about this, to see if they can make a 32-bit version of the installer available…

  6. feuvan says:

    why not just provide a .zip….

  7. Tess says:

    I’m wondering about that too:)  will ask Tom,

    I really appreciate the feedback, please feel free to also comment on Toms blog about issues with the download package as he is more in the loop there, as far as being able to change something with it.

  8. Daniek says:

    Thanks for making that extension public!

  9. Daniel says:

    Thanks for making that extension public!

  10. Francisco says:

    on x86 machines it’s possible to extract the content with winrar, you’ve had to do it twice to get the x86 versión of the dll, I did it and use psscor2 without any problem, and I must say that it’s a great extension.

  11. athman says:

    "I will likely do the same later on as wellโ€ฆ"

    waiting for your posts

  12. TSW says:

    This is great! It’s unfortunate how badly the installer was botched.

    It’s a 64-bit "installer" that when you run it, simply extracts a basic .zip file, which itself contains 3 versions of the DLL, for x86, 64bit, amd, etc. Whoa… how about just putting the .zip file up ๐Ÿ˜‰

    Within 5 seconds of using this, we’ve narrowed down some problems!!!

  13. varun_agg100 says:

    Amazing stuff…..have already started using new commands….really helpful…..Thanks a lot Tom and Jon…..

    And help file posted by Jim above is another piece of nice work….bravo guys…. ๐Ÿ™‚

    Just one thing, if Microsoft can throw some documentation, help for writing extensions…..I know many ppl have been waiting for this… would be really boost for debugging community…..


  14. Tess says:

    There should be a 32-bit installer now, thanks to all the feedback about this ๐Ÿ™‚

  15. Alexandre Grenier says:

    Ahhhh for ASPX too! Are you an angel? I must be in debugging heaven!!! lol

  16. Kevin Goff says:

    any chance we'll see psscor2 for .net 4.0 anytime soon?

  17. Bug says:

    Psscor4 Managed-Code Debugging Extension for WinDbg…/details.aspx

  18. Heil79 says:

    Does this work for analyzing dumps from Compact Framework applications?

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