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Ok, last question: &nbsp;Windbg runs only in user mode, or kernel mode, correct? &nbsp;It cannot run an application from user mode and then step into kernel mode code, right?<br />
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I thought this was possible, but from what I've read, and including your response, kernel mode debugging requires the debugger be put into kernel mode debugging state.<br />

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In addition to my last post - if you try second variant,<br />
keep in mind that if WinDbg is started and connected to target kernel,<br />
that breakpoint in user mode process completely stops all target processor,<br />
like when you debugger kernel driver.<br />
This is difference against WinDbg connected only to user-mode process.<br />
(ar against debugger in Visual Studio) <br />

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I am debugging an application that calls a kernel mode driver...I have full source code for all modules, including the kernel mode driver (.sys file). &nbsp;I am able to get all the symbols loaded (.pdb) files for all modules but the kernel mode driver. &nbsp;I am able to put breakpoints in all the user mode code. <br />
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I am unable to get the kernel mode driver symbol (.pdb) file loaded, nor is it able to find the source code (when I attempt a breakpoint in the driver code). &nbsp;What can I do to force the loading of the kernel mode driver symbol file and source code, so that I can debug from application level to kernel mode level from windbg?
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I am debugging an application that calls a kernel mode driver...I have full source code for all modules, including the kernel mode driver (.sys file).  I am able to get all the symbols loaded (.pdb) files for all modules but the kernel mode driver.  I am able to put breakpoints in all the user mode code. 

I am unable to get the kernel mode driver symbol (.pdb) file loaded, nor is it able to find the source code (when I attempt a breakpoint in the driver code).  What can I do to force the loading of the kernel mode driver symbol file and source code, so that I can debug from application level to kernel mode level from windbg?

Windbg debugger symbol problem

Software is any set of instructions that directs a computer to perform specific tasks or operations. Computer software consists of programs, libraries and related non-executable data (such as documentation). Computer software is non-tangible, contrasted with computer hardware, which is the physical component of computers. Software written in a machine language is known as "machine code". However, in practice, software is usually written in high-level programming languages than machine language. High-level languages are translated into machine language using a compiler or interpreter or a combination of the two.

Software

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.

System Programming

Most development for the Microsoft platform is done utilizing the technologies supported by the.NET framework. Other development is done using Visual Basic for Applications (VBA) for programs like Access, Excel, Word and Outlook, with PowerShell for scripting, or with SQL for large databases.