[Verse 1] When your system starts to freeze and crash Applications hang, performance turns to trash It's time to dive below the user space Where kernel mysteries hide without a trace Boot parameters help you take control Console equals tty S zero makes the goal Serial debugging when the screen goes black Kernel messages will guide you right back [Chorus] K D B for kernel debug mode G D B remote when the system's slowed Trace and profile, find the bottleneck P E R F and F trace help you double-check Memory leaks and deadlocks in the night Kernel debugging brings them to light [Verse 2] Kernel address space layout randomization Can make your debugging a frustration But with the right tools you'll find your way Through virtual memory where the problems lay Oops messages tell a story clear Stack traces show what happened here Segmentation faults and page fault storms System call analysis keeps you warm [Chorus] K D B for kernel debug mode G D B remote when the system's slowed Trace and profile, find the bottleneck P E R F and F trace help you double-check Memory leaks and deadlocks in the night Kernel debugging brings them to light [Bridge] S Y S R Q magic key combination Emergency sync for system salvation Enable debug info in your kernel build Symbols and line numbers help skills Lock dependency checking finds the race R C U stall warnings show the pace [Verse 3] Performance counters tell the deeper tale Cache misses, branch prediction fail Hardware events and software events too P M U data gives you the breakthrough Context switches eating up your time Interrupt handling out of paradigm System load average doesn't tell it all Kernel profiling prevents the fall [Chorus] K D B for kernel debug mode G D B remote when the system's slowed Trace and profile, find the bottleneck P E R F and F trace help you double-check Memory leaks and deadlocks in the night Kernel debugging brings them to light [Outro] From user space down to hardware low Kernel debugging helps your knowledge grow Performance analysis shows the way To fix the bugs that ruin your day
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