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  • Blog Post: Understanding Pool Corruption Part 3 – Special Pool for Double Frees

    In Part 1 and Part 2 of this series we discussed pool corruption and how special pool can be used to identify the cause of such corruption.  In today’s article we will use special pool to catch a double free of pool memory.   A double free of ...read more
  • Blog Post: How To Deadlock Yourself (Don’t Do This)

    Some APIs should come with a warning in big red letters saying “ DANGER! ”, or perhaps more subtly “ PROCEED WITH CAUTION ”.  One such API is ExSetResourceOwnerPointer . Although the documentation contains an explanation of what limited activity ...read more
  • Blog Post: What Did Storport Do With My I/O?

    In a previous article I showed how to track an I/O request from the filesystem, through the class driver, and to the storage driver.  In that article I concluded with " From this data we can usually assume that the request has been sent to the ...read more
  • Blog Post: Configuring a Hyper-V VM For Kernel Debugging

    Yesterday's blog prompted some questions about how to set up a debugger for a Windows OS running in a Hyper-V VM.   I was surprised that I wasn't able to find good, publicly available, Microsoft issued documentation for this configuration.   ...read more
  • Blog Post: My Kernel Debugger Won't Connect

    Hello ntdebugging readers, the Debug Ninja is back again with a quick blog this holiday season.   I recently encountered a situation where the kernel debugger could not connect to a Windows Server 2008 R2 system running in a Hyper-V virtual machine ...read more
  • Blog Post: Understanding Pool Corruption Part 1 – Buffer Overflows

    Before we can discuss pool corruption we must understand what pool is.  Pool is kernel mode memory used as a storage space for drivers.  Pool is organized in a similar way to how you might use a notepad when taking notes from a lecture or a ...read more
  • Blog Post: Use Caution When Implementing IPC for Performance Counters

      Recently I was working with a developer who had created performance counters that work in Performance Monitor but are never collected in a user defined data collector set.  The customer explained that their counters update named shared memory ...read more
  • Blog Post: Troubleshooting Pool Leaks Part 7 – Windows Performance Toolkit

    In Part 1 of this series we identified a pool leak in non paged pool.  In Part 2 and Part 3 of this series we identified what pool tag was leaking.  In Part 5 and Part 6 we got call stacks showing the memory being allocated.  In this article ...read more
  • Blog Post: Understanding Pool Corruption Part 2 – Special Pool for Buffer Overruns

    In our previous article we discussed pool corruption that occurs when a driver writes too much data in a buffer.  In this article we will discuss how special pool can help identify the driver that writes too much data.   Pool is typically organized ...read more
  • Blog Post: Updated Archive of the NtDebugging Twitter Debug Tips

    Every Wednesday (usually) we post a debug tip to our twitter page at https://twitter.com/#!/ntdebugging . This blog is an archive of these tips to allow our readers to find this information easily. Periodically we post an updated blog with the current ...read more
  • Blog Post: Troubleshooting Pool Leaks Part 5 – PoolHitTag

    In Part 4 we narrowed the source of the leaked pool memory to the specific driver which is allocating it, and we identified where in the driver this allocation was taking place.  However, we did not capture contextual information such as the call ...read more
  • Blog Post: Troubleshooting Pool Leaks Part 4 – Debugging Multiple Users for a Tag

    In our previous articles we discussed various techniques for identifying a pool memory leak and narrowing the scope of the leak to an individual pool tag.  Knowing the leaking pool tag is often sufficient to identify the cause of the problem and ...read more
  • Blog Post: Identifying Global Atom Table Leaks

    Hi, it's the Debug Ninja back again with another debugging adventure.   Recently I have encountered several instances where processes fail to initialize, and a review of available resources showed that there was no obvious resource exhaustion.   ...read more
  • Blog Post: Where Did My Disk I/O Go?

    Hello, Mr. Ninja back again.   I recently discovered that although my team often tracks I/O from the file system through to the disk controller, we have never publicly documented the steps required to do this.   This seems like a great opportunity ...read more
  • Blog Post: Troubleshooting Pool Leaks Part 3 – Debugging

    In our previous articles we discussed identifying a pool leak with perfmon , and narrowing the source of the leak with poolmon .  These tools are often preferred because they are easy to use, provide verbose information, and can be run on a system ...read more
  • Blog Post: Call Stacks for Pool Allocations

    Hello, it's the Debug Ninja back again for another NtDebugging Blog article.   For as long as I can remember user mode debuggers have had an easy way to get call stacks for heap allocations.   On more recent versions of Windows this has been ...read more
  • Blog Post: The Compiler Did What?

    I was recently investigating a crash in an application.  As I researched the issue I found a very old defect in the code that was only recently being exposed by the compiler.   The crash occurred at the below instruction because the ebx register ...read more
  • Blog Post: Troubleshooting Pool Leaks Part 1 – Perfmon

    Over the years the NTDebugging Blog has published several articles about pool memory and pool leaks.  However, we haven’t taken a comprehensive approach to understanding and troubleshooting pool memory usage.  This upcoming series of articles ...read more
  • Blog Post: Debugging a Debugger to Debug a Dump

    Recently I came across an instance where my debugger did not do what I wanted.  Rarely do computers disobey me, but this one was unusually stubborn.  There was no other option; I had to bend the debugger to my will.   There are many ways ...read more
  • Blog Post: Troubleshooting Pool Leaks Part 2 – Poolmon

    In our previous article we discussed how to identify a pool leak using perfmon.  Although it may be interesting to know that you have a pool leak, most customers are interested in identifying the cause of the leak so that it can be corrected.  ...read more