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April 2008 - Posts

Announcement: ODbgExt (Open Debugger Extension) on CodePlex

Hello NTDebuggers, I’d like to announce something new for our community to share. We have decided to host an Open Source Debugger Extension project called ODbgExt on codeplex.com Right now it’s just the basic framework. This will be something we can work Read More...
Posted Tuesday, April 29, 2008 7:28 PM by ntdebug | 3 Comments
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NTDebugging Puzzler 0x00000004: This didn’t puzzle the Debug Ninja, how about you?

Hello NTDebuggers, we have been very impressed with the responses we’ve gotten to our previous puzzlers so far. We invited the Debug Ninja to come up with a real challenge for this week. This server blue screened with a Bug Check 0xD1: DRIVER_IRQL_NOT_LESS_OR_EQUAL. Read More...
Posted Monday, April 28, 2008 8:18 PM by ntdebug | 12 Comments

The Debug Ninja speaks: Debugging a stop 0x20

Hello, I am the Debug Ninja. Recently Jeff approached me about contributing to this debugging blog, and as the Debug Ninja I felt an obligation to share at least a small amount of Ninja knowledge with the world. Today I will start by explaining how to Read More...
Posted Wednesday, April 23, 2008 1:51 PM by ntdebug | 2 Comments

NTDebugging Puzzler 0x00000003 (Matrix Edition) Some assembly required.

Hello NTdebuggers, I'm very impressed with the depth of the answers we are seeing from our readers. As I stated in last week's response, this week's puzzler is going to be harder. With that said let's take it up a notch. One of the things that is really Read More...
Posted Monday, April 21, 2008 4:13 PM by ntdebug | 37 Comments
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More dump forensics, understanding !locks, in this case a filter driver problem

Written by Jeff Dailey: Hello NTDebuggers, one of the most important things to understand in kernel debugging hung servers is the output of !locks. There can be a lot of data and it’s not always clear what is going on. One of the things I like to do in Read More...
Posted Thursday, April 17, 2008 8:25 PM by ntdebug | 2 Comments
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Would you be interested in a live chat session on debugging techniques?

We’ve been thinking about hosting a live group chat session to talk with the debugging community. If we had such a chat, the discussion would focus on debugging techniques and any questions you may have about anything we’ve previously blogged about. If Read More...
Posted Wednesday, April 16, 2008 9:33 PM by ntdebug | 9 Comments

The Digital DNA of Bugs, Dump Analysis as Forensic Science

Written by Jeff Dailey: As a debugger, have you ever reflected on the interesting parallels between your job and work being done in other industries? When I think about solving complex computer problems, I think of it as forensics. The core diagnostics Read More...
Posted Tuesday, April 15, 2008 5:10 PM by ntdebug | 2 Comments

Debug puzzler 0x00000002 “Attack of the crazy stack”

Hi NTDebuggers, I have another puzzler for you. We started crash2.exe under windbg and it crashed. Go figure! Sometimes we have a very limited amount of data available to figure out what went wrong. That being said, this week’s puzzler only gives you Read More...
Posted Monday, April 14, 2008 9:09 PM by ntdebug | 17 Comments
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Closing the loop: CPU spike in winlogon.exe

We recently dealt with an interesting issue that I would like to share, hope you enjoy. - Jason Issue Summary Customer reports that within their Citrix server farm (running on Windows Server 2003), when a user logs into or out of a session (seems more Read More...
Posted Thursday, April 10, 2008 5:06 PM by ntdebug | 3 Comments
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Hardware bitflipping

Hello all; my name is Scott Olson and I work as an Escalation Engineer for Microsoft Global Escalation Services team in Platforms support, and I wanted to share an interesting problem that came up recently. A co-worker was running Windows Vista Ultimate Read More...
Posted Tuesday, April 08, 2008 5:44 PM by ntdebug | 7 Comments

NTDebuggers Debug Puzzler 0x00000001 "Where did my process go?"

Hello NTDebuggers, in the spirit of Click and Clack (The Tappet brothers), a favorite troubleshooting show of mine, we thought it would be fun to offer up some Debug puzzlers for our readers. That said, this week’s Debug Puzzler is in regard to Dr. Watson Read More...
Posted Monday, April 07, 2008 3:44 PM by ntdebug | 10 Comments
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Windows Performance Toolkit - Xperf

I recently came across a very interesting profiling tool that is available in Vista SP1 and Server 08 called the Windows Performance Analyzer. You can use this tool to profile and diagnose different kinds of symptoms that the machine is experiencing. Read More...
Posted Thursday, April 03, 2008 10:06 PM by ntdebug | 10 Comments
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The case of the low hanging filter driver fruit

Written By Jeff Dailey: Not all our cases are crashes, leaks, or high CPU. Sometimes the problems we are faced with are purely a question of why a given application runs slow on a particular version of Windows versus another version of windows. I n other Read More...
Posted Tuesday, April 01, 2008 1:50 PM by ntdebug | 1 Comments
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