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Special Command—Using .dump/.dumpcab to Get Dumps and Symbols from Production Servers

Using WinDbg you can create a dump file from an application running, for instance, in a production server. After collecting the dump file, you can load it in another machine and debug it. However, to be more effective during your debugging session you Read More...
Posted Wednesday, September 16, 2009 12:55 AM by Roberto Farah | 3 Comments

Special Command—Using !for_each_frame to Run Commands

!for_each_frame is a favorite among debuggers. It's a very flexible and powerful command that enables you to run commands for each frame of the call stack. You can use basically any command. For instance, let’s say you want to see all local variables Read More...
Posted Thursday, August 20, 2009 3:07 AM by Roberto Farah | 2 Comments

Special Command—CPU Time for Each Thread with !runaway

This is one of my favorite commands! !runaway displays information about the CPU time consumed by each thread in User Mode and Kernel Mode. It is one of those commands you run when you think the application is hung with low or high CPU or has some kind Read More...
Posted Thursday, August 20, 2009 2:55 AM by Roberto Farah | 0 Comments

[PowerShell Script] Statistics from .NET Applications

This script is more a template to show you how to use PowerDbg. I must say the idea is from my teammate Aaron Barth! This script collects information from all threads running managed code and gives the user statistics by threads like: - CLR stack. - Managed Read More...
Posted Wednesday, April 15, 2009 6:52 AM by Roberto Farah | 1 Comments

Special Command—Parsing Strings, Files, and Commands Output Using .foreach

This is by far one of the most powerful WinDbg commands. Even if you don’t create scripts, you’ll benefit from this command. It’s powerful because it’s flexible. You can use it for a huge variety of operations. The .foreach token parses the output of Read More...
Posted Thursday, March 12, 2009 1:41 AM by Roberto Farah | 1 Comments

Special Command—Parsing Commands Using .shell

Finally I’m writing about this command. I love it! It’s so powerful! .shell command launches a shell process and redirects its output to the debugger or to a specified file. Usage: .shell [ Options ] [ ShellCommand ] .shell -i InFile [ -o OutFile [ -e Read More...
Posted Thursday, February 19, 2009 8:51 PM by Roberto Farah | 1 Comments

[WinDbg Script] Displaying Queries/Stored Procedures from Threads Running Managed Code

There’s another script that gives you all queries/stored procedures from SQL Server or Oracle that are stored in the managed heap. This script is more specific because it gives you the query/stored procedure running in a specific thread. It has the option Read More...
Posted Sunday, February 01, 2009 7:18 PM by Roberto Farah | 3 Comments

Special Command: Using s to Explore The Memory

Very often I found myself scanning the stack or the entire virtual memory for the process to find information that may help me. This information may be strings, DWORDS, bytes, chars, etc… To accomplish this you should use the s command. Here I exemplify Read More...
Posted Tuesday, March 11, 2008 5:58 PM by Roberto Farah | 1 Comments

Special Command: Using ~, the Thread Identifier

When debugging, most of the time, you have to see all stacks for all threads or to set the context for a specific thread in order to analyze it. To do that you use the ~ command. According to the WinDbg documentation we have: Thread identifier Description Read More...
Posted Wednesday, March 05, 2008 8:57 AM by Roberto Farah | 1 Comments
 
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