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Special Command—Unassembling code with u, ub and uf

When debugging sooner or later you will need to disassemble code to get a better understanding of that code. By disassembling the code, you get the mnemonics translated from the 0s and 1s that constitute the binary code. It is a low level view of the Read More...
Posted Thursday, November 05, 2009 9:27 PM by Roberto Farah | 2 Comments

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—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] PowerDbg v5.2—Using PowerShell to Control WinDbg

This version has two improvements and some scripts were changed to be compatible with this new version: - Starting on version 5.2 the log used to save the command output, enabling the communication between PowerShell and WinDbg is not used anymore. Now Read More...
Posted Wednesday, April 15, 2009 6:43 AM by Roberto Farah | 3 Comments

[PowerShell Script] PowerDbg v5.1—Using PowerShell to Control WinDbg

So, here we go again. This is a minor version with a few new cmdlets. These new cmdlets are those that we use most of the time. DOWNLOAD POWERDBG Download PowerDbg POWERDBG FILES WinDbg.PSM1 ß Contains cmdlets used to communicate with WinDbg . Microsoft.PowerShell_Profile. Read More...
Posted Thursday, March 19, 2009 7:28 PM by Roberto Farah | 3 Comments

Special Command—Peeking Memory Addresses Using !address

Let’s say that you get a memory address and you want to know if it’s from the heap, the stack, or someplace else. Or yet, let’s say you have a .NET application consuming lots of memory, and you want to get a better understanding of this memory consumption. Read More...
Posted Tuesday, March 17, 2009 11:10 PM by Roberto Farah | 2 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

[PowerShell Script] PowerDbg v5.0—Using PowerShell to Control WinDbg

I’m very excited to present the new PowerDbg v5.0! There’s just one change, but it’s a HUGE change that makes PowerDbg extremely fast and easier to use. Let me explain: Send-PowerDbgCommand is the heart of PowerDbg . This is the cmdlet that sends information Read More...
Posted Wednesday, February 04, 2009 3:38 AM 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

[PowerShell Script] Finding Out the Managed Objects that "Leaked"

Here in PFE most of my teammates use the same approach to identify managed objects that “leak”. The idea is to run !DumpHeap –stat once, wait several minutes to allow the “leak” to make itself evident, then run the command a second time. After that you Read More...
Posted Friday, November 14, 2008 12:02 AM by Roberto Farah | 10 Comments

[PowerShell Script] PowerDbg v4.0 - Using PowerShell to Control WinDbg

Good news! Here’s the newest PowerDbg library. This version is more stable and has more features. Let me tell you about them and how to install it. New Features - Send-PowerDbgCTRL-BREAK / Send-PowerDbgResumeExecution If you’re wondering why do you need Read More...
Posted Friday, August 15, 2008 12:14 AM by Roberto Farah | 3 Comments

Troubleshooting Software Problems: A Scientific Approach

Years ago, when working for an Escalation Team, we decided to create a documentation to formalize the approach we use to isolate software problems, something I've been doing for years since the time I read a great book about the subject. Actually, it’s Read More...
Posted Thursday, July 03, 2008 8:18 AM by Roberto Farah | 5 Comments

Comparing RegEx.Replace, String.Replace and StringBuilder.Replace – Which has better performance?

A few days ago I was with Frank Taglianetti (no links here, he doesn’t have a blog yet), a PFE from my team that I met for the first time at that day while doing a Lab for one of our customers. By Lab I mean stress testing and troubleshooting a customer’s Read More...
Posted Wednesday, April 02, 2008 7:07 AM by Roberto Farah | 19 Comments
 
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