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Key benefits

Fully understand how to use a variety of kernel and module debugging tools and techniques using examples

Learn to expertly interpret a kernel Oops and identify underlying defect(s)

Use easy-to-look up tables and clear explanations of kernel-level defects to make this complex topic easy

Description

The Linux kernel is at the very core of arguably the world’s best production-quality OS. Debugging it, though, can be a complex endeavor. Linux Kernel Debugging is a comprehensive guide to learning all about advanced kernel debugging. This book covers many areas in-depth, such as instrumentation-based debugging techniques (printk and the dynamic debug framework), and shows you how to use Kprobes. Memory-related bugs tend to be a nightmare – two chapters are packed with tools and techniques devoted to debugging them. When the kernel gifts you an Oops, how exactly do you interpret it to be able to debug the underlying issue? We’ve got you covered. Concurrency tends to be an inherently complex topic, so a chapter on lock debugging will help you to learn precisely what data races are, including using KCSAN to detect them. Some thorny issues, both debug- and performance-wise, require detailed kernel-level tracing; you’ll learn to wield the impressive power of Ftrace and its frontends. You’ll also discover how to handle kernel lockups, hangs, and the dreaded kernel panic, as well as leverage the venerable GDB tool within the kernel (KGDB), along with much more. By the end of this book, you will have at your disposal a wide range of powerful kernel debugging tools and techniques, along with a keen sense of when to use which.

Who is this book for?

This book is for Linux kernel developers, module/driver authors, and testers interested in debugging and enhancing their Linux systems at the level of the kernel. System administrators who want to understand and debug the internal infrastructure of their Linux kernels will also find this book useful. A good grasp on C programming and the Linux command line is necessary. Some experience with kernel (module) development will help you follow along.

What you will learn

Explore instrumentation-based printk along with the powerful dynamic debug framework

Use static and dynamic Kprobes to trap into kernel/module functions

Catch kernel memory defects with KASAN, UBSAN, SLUB debug, and kmemleak

Interpret an Oops in depth and precisely identify it s source location

Understand data races and use KCSAN to catch evasive concurrency defects

Leverage Ftrace and trace-cmd to trace the kernel flow in great detail

Write a custom kernel panic handler and detect kernel lockups and hangs

Use KGDB to single-step and debug kernel/module source code

What do you get with eBook?

Instant access to your Digital eBook purchase

Download this book in EPUB and PDF formats

Access this title in our online reader with advanced features

DRM FREE - Read whenever, wherever and however you want

AI Assistant (beta) to help accelerate your learning

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Arnaud Sautaux Aug 12, 2024

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Bill Gatliff Nov 30, 2022

This book is clearly written, and is easily recommended for anyone starting to tinker with and tailor a Linux kernel. For most people Linux "just works", but when you want to adapt Linux for your own special projects--and you should, especially for RPi or Beaglebone---you'll soon need to leverage the kernel's debugging tools. This book will get you started in the right direction.

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Ashwin Murali Dec 03, 2022

Just like his first book on the Linux Kernel, Kaiwan covers a lot of topics in very good detail. A wonderful read!

CTH Aug 14, 2022

If you are a serious Linux kernel developers, this book is for you.Basically the book will go through all the existing debugging, tracing, diagnostics framework for kernel developers.Also each chapters come with sample codes (available free on Github at github.com/PacktPublishing/Linux-Kernel-Debugging), so all the material are accompanied by real code you can try.All the sample code work on x86 in a VM or real machine, also work on ARM (Raspberry Pi).If you still debug with simple printk, you should upgrade your debugging game, your peers will look at you like a god next time when you able to pinpoint an elusive kernel issue.As software engineer, especially the one debugging at the kernel level, we all know how difficult and challenging it is, it is not easy as doing user space stuff.There are many frameworks, just pick one to start, the one I like most is KASAN and FTRACE, of course I debug using remote gdb, the book tells you step by step how to do as well.I highly recommend this book, of course it is not for everybody, but for the one who needs it the most will certainly appreciate the effort Kaiwan made to put in a single location all the kernel debugging facilities.(disclosure: I am the Technical Reviewer for the book).

Ming-Yi Liao Dec 26, 2023

understand how to debug Linux kernel.

Linux Kernel Debugging: Leverage proven tools and advanced techniques to effectively debug Linux kernels and kernel modules

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