Kernel

Linux kernel troubleshooting guides, crash dump content, CPU behavior, lockup analysis, and low-level execution concepts.

Use this section to understand kernel behavior, investigate failures, and go deeper into the low-level mechanics behind Linux systems.

Common tasks

  • Prepare a system to collect crash dumps before a kernel panic occurs
  • Understand why a machine hung, soft-locked, or hard-locked
  • Learn how privilege levels and system calls shape performance and security behavior
  • Investigate CPU statistics and kernel symptoms with better context
Soft and Hard Lockups

Detect, troubleshoot, and simulate Linux kernel soft and hard lockups with the watchdog.

Why Kernel Crash Dumps Are Critical for Root Cause Analysis

Deep-dive on using vmcore crash dumps for postmortem kernel debugging, including real-world kernel bug and OOM workflows.

Enabling Automatic Kernel Crash Collection with kdump

How to automatically enable and configure kdump crash collection on Linux systems using the kdump-enabler script.

Kernel Mode vs User Mode: Privilege Levels and System Call Execution

Deep technical explanation of CPU privilege levels, kernel mode vs user mode execution contexts, system call mechanisms, memory protection, and security implications in the Linux kernel.

Understanding CPU Statistics in Linux (/proc/stat)

Deep technical dive into CPU time accounting in Linux, covering user, nice, system, idle, iowait, irq, softirq, steal, guest, and guest_nice statistics with practical examples and kernel internals.


Last modified May 26, 2026: Improve docs discoverability and section hubs (5a84deb)