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ASP.NET Memory Leak: Byte arrays rooted in System.Security.Policy.Evidence

Posted Wednesday, June 25, 2008 4:04 PM by Tess
Today I got a question from a reader (Chris) about a memory leak they are seeing in their application When we do a '!dumpheap -min 85000 -type Byte[]' we can see 100s of byte array objects using up ~545MB of memory. A majority of the objects are the same Read More...
1 Comments

100% CPU in vbc.exe when compiling large vb.net web applications in Microsoft Visual Studio 2008

Posted Monday, June 23, 2008 12:52 PM by Tess
We just released a hotfix for an issue where you get 100% CPU in vbc.exe when compiling large applications in Microsoft Visual Studio 2008. Apart from the 100% CPU situation you may also notice symptoms like visual studio taking a very long time to return Read More...
12 Comments

Presenting at TechEd Developers Europe 2008, Barcelona

Posted Friday, June 13, 2008 10:14 AM by Tess
Save the date!  TechEd Developers North America 2008 just finished but there is plenty more to come... I know it's a bit early still, but November 10th through 14th TechEd Developer 2008 is coming to Barcelona, Spain and the session list is already Read More...
0 Comments
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ASP.NET Case Study: Deadlock waiting in GetToSTA

Posted Thursday, June 12, 2008 11:44 AM by Tess
This is an issue I come across once in a while and since I am not a COM expert by any means I actually had to check in with our COM guys to see what was going on in this case, and as it turned out (this is embarrassing:)) I had already written about the Read More...
5 Comments

CLR Inside Out: Large Object Heap Uncovered

Posted Monday, June 09, 2008 10:22 AM by Tess
In many of my posts I have discussed performance issues and memory issues caused by excessive use of the Large Object Heap, here are a few examples... ASP.NET Case Study: High CPU in GC - Large objects and high allocation rates ASP.NET Case Study: Bad Read More...
1 Comments

Setting .NET breakpoints in Windbg for applications that crash on startup

Posted Thursday, June 05, 2008 3:51 PM by Tess
I recently received a question from a reader who wanted to know how to set breakpoints in code for applications that crash on startup. The email went like this: I have a .NET app which is crashing upon startup (it even causes DW20.exe to make an appearance). Read More...
4 Comments

ASP.NET Memory: Thou shalt not store UI objects in cache or session scope

Posted Wednesday, May 28, 2008 2:23 PM by Tess
ASP.NET Memory: Thou shalt not store UI objects in cache or session scope Surprisingly the issue I wrote about in " the eventhandlers that made the memory baloon " (Jan 2006) is something that still happens very frequently, I reference it in Read More...
11 Comments

My presentation on Troubleshooting ASP.NET applications at Oredev

Posted Monday, May 26, 2008 12:01 PM by Tess
The guys at Oredev are in the midst of preparing for the next Oredev conference in November. Sadly I won't be presenting there this year because of other comittments. I say sadly because it was an awesome event last year. If you want to check out my presentation Read More...
1 Comments

The 21 most popular blog posts

Posted Wednesday, May 21, 2008 3:45 PM by Tess
I started this blog 2.5 years ago today, mostly because I felt that the same types of issues came up over and over and over in our support cases. I figured that if I started writing about them, a lot of people would be able to resolve them on their own, Read More...
7 Comments

DebugDiag 1.1 or Windbg, which one should I use? and how do I gather memory dumps

Posted Wednesday, May 21, 2008 1:40 PM by Tess
If you have read any of my posts you have probably noticed that I am very partial to windbg and the debugging tools for windows. I often get friendly nudges from the developers of debugdiag when I suggest using adplus and windbg on internal discussion Read More...
7 Comments

ASP.NET Performance issue: Large number of application restarts due to virus scanning

Posted Wednesday, May 14, 2008 9:44 AM by Tess
Issues caused by frequent application restarts are pretty common. If you are interested in what causes application restarts in general, and how you can monitor application restarts and what causes them you should read this post: ASP.NET Case Study: Lost Read More...
9 Comments

"Failed to start stack walk: 80004005", "Following frames may be wrong" and other errors you may see in windbg

Posted Tuesday, May 13, 2008 4:33 PM by Tess
When you debug .net applications you will sometimes get error messages in windbg. Here are a few of the ones I most commonly get questions around... Failed to start stack walk If you run the sos command !clrstack to display the .net stack on a thread, Read More...
13 Comments

ASP.NET Hang: Authenticode signed assemblies

Posted Tuesday, May 13, 2008 11:26 AM by Tess
When you use authenticode signed assemblies in an application, the application needs to go out and check the certificate revocation lists (CRLs) to verify that the signature is still valid the first time it loads up the authenticode signed assembly. If Read More...
0 Comments

ntdll!kifastSystemcallret, SharedUserData!SystemCallStub and search engines...

Posted Wednesday, May 07, 2008 11:31 AM by Tess
If I were to pick out ten keywords for my blog I would pick, in no particular order, ASP.net, windbg, sos, debugging, .net exceptions, memory leaks, performance issues, OutOfMemory exceptions, garbage collection, troubleshooting. Those are the things Read More...
0 Comments

ASP.NET Crash: StackOverflowException with Server.Transfer

Posted Tuesday, May 06, 2008 10:54 AM by Tess
I have written a few posts about stackoverflow exceptions, here, here , here and here . The one I am going to talk about today is one of those unfortunate cases where you are trying to do the right thing and still shoot yourself in the foot. Problem description: Read More...
13 Comments
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