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Input validation and another StackOverflow

Here’s another interesting crash problem I worked on a few days ago: the application pool was randomly crashing and the following errors were logged: Event Type:      Error Event Source:   .NET Runtime 2.0 Error Reporting Read More...
Posted Tuesday, October 06, 2009 4:55 PM by Carlo Cardella | 1 Comments
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Logparser automated within Windbg

The .shell command in Windbg allows to pipe the output of a debugger command to an external process and automatically print its output back inside the debugger window; a useful example is the command FIND, for example if we want to parse the stack for Read More...
Posted Friday, May 08, 2009 6:50 PM by Carlo Cardella | 1 Comments

StackOverflowException and DataBind()

The application pool for this site was getting disabled quite frequently and we found quite a few entries like the following in the event log: Event Type: Error Event Source: W3SVC Event Category: None Event ID: 1002 Date: 19/11/2008 Time: 15:20:23 User: Read More...
Posted Monday, April 27, 2009 7:05 PM by Carlo Cardella | 3 Comments

Where’s my dump gone?!?

Have you ever found yourself patiently waiting for a problem to reproduce with your debugger ready, and when it happens you just find there are no signs of your dump anywhere? If you are using adplus you likely had the text logs, but nothing more… In Read More...
Posted Tuesday, April 14, 2009 10:45 PM by Carlo Cardella | 2 Comments
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ViewState validation troubles?

If you work with web sites in a complex/multi server environment you might be familiar with this error and as the error message itself suggest, the first thing to check if the machineKey value which must be the same across all of the involved server. Read More...
Posted Tuesday, December 23, 2008 11:06 PM by Carlo Cardella | 2 Comments

How much garbage to you still have on the managed heap?

When you’re focused on a specific problem, you’re sunk into it and you’re at a dead end, you have to take a step back to see the whole picture and breath again before being able to continue; often discussing with a colleague whom still has a “fresh mind” Read More...
Posted Tuesday, December 02, 2008 3:18 PM by Carlo Cardella | 0 Comments
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Troubles downloading public symbols?

Imagine you are debugging your dump, are already looking forward for the output of the command you just typed (say a kpn to get the stack of a thread) and you get this message instead: *** ERROR: Symbol file could not be found.  Defaulted to export Read More...
Posted Friday, November 14, 2008 8:30 AM by Carlo Cardella | 1 Comments

Invalid length for a Base-64 char array

There are various causes for this error, this is one we had some time ago when paginating through a DataGrid (for this case we’re talking about ASP.NET 1.1); the error appeared systematically under a specific user pattern: Invalid length for a Base-64 Read More...
Posted Wednesday, November 05, 2008 5:13 PM by Carlo Cardella | 3 Comments

Visual Studio 2008 crashes in “split view”

“Split view” is one of the new features in Visual Studio 2008 web designer: this is the possibility to have Design View and Source View of your page at the same time (see What's New in ASP.NET and Web Development , “Visual Web Developer Enhancements” Read More...
Posted Thursday, July 10, 2008 9:07 AM by Carlo Cardella | 11 Comments

An interesting fusion cache lock: that’s what the GAC is meant for

This has been an interesting case where we had an ASP.NET 2.0 application which under load was completely blocked after a few minutes. Since we were talking about a hang/deadlock (as reported from the customer), the !critlist command (you can find the Read More...
Posted Monday, June 23, 2008 5:09 PM by Carlo Cardella | 5 Comments

autoConfig=”false” effects

My post on autoConfig triggered and interesting discussion with my colleague Cenk about which is the real effect of this setting; one of his customers asked what to do if they needed to adjust only one or two values and not all the ones discussed in Contention, Read More...
Posted Wednesday, June 18, 2008 5:40 PM by Carlo Cardella | 3 Comments

Switch thread using the ThreadID

Quick hint for today: how do you switch the thread you’re examining in Windbg ? If you know the thread number you can type the command ~<thread number>s (e.g. ~21s to switch to thread 21). But what about if you only know the ThreadID (which is an Read More...
Posted Wednesday, May 28, 2008 5:47 PM by Carlo Cardella | 0 Comments
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And when you think there's nothing left to do... you can still debug live

There are circumstances where taking a dump is not possible or simply not convenient; imagine a situation where you're hunting a nasty exception you don't know where it comes from and you need to follow some complex steps to get there, or when you have Read More...
Posted Saturday, March 08, 2008 7:45 PM by Carlo Cardella | 1 Comments
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aspnet_wp.exe can not be started. Code: 80070003

This was a Windows 2000 server with ASP.NET 1.1 installed, and for some reason the customer was unable to start his web applications, he was getting "Server Application Unavailable" messages on the client. We found the Application event log Read More...
Posted Tuesday, February 19, 2008 3:45 PM by Carlo Cardella | 1 Comments

Need to print from a x64 machine? Can you wait 60 seconds?

I guess some of you might have developed a web application which, among other functionalities, prints some kind of report; and sooner or later you might consider to move the application to a 64 bit machine. At this is what this customer did. They had Read More...
Posted Thursday, January 31, 2008 8:33 PM by Carlo Cardella | 1 Comments
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