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Challenge

Exercise

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It’s essential to examine core dumps to diagnose any non-trivial hangs or crashes due to a user process or the kernel faults. Most people have no training in dealing with core dumps, so the causes of most crashes remain undiagnosed.

This course starts with debugging core dumps. You will learn how to debug the Linux process and kernel failures (using the GDB debugger and the crash utility), browse core memory dumps, identify corruption, memory leaks, CPU spikes, halted threads, deadlocks and wait chains, among other things.

Instead of taking a theoretical route, you will focus on hands-on lessons on a variety of memory analysis patterns found in 64-bit core memory dumps from the x64 architecture. You will follow the novel pattern-oriented diagnostic analysis approach that considerably helps with the analysis. Moreover, the course will provide you with problematic applications and the associated core dumps, along with brief descriptions of relevant patterns and some frequently asked questions.

Accelerated Linux Core Dump Analysis

To print the kernel stack trace in the `crash` utility, which command should we use?

To print the kernel stack trace in the <code>crash</code> utility, which command should we use?

**(Select all that apply.)** To examine the kernel logs, which command should we use? 



(Select all that apply.) To examine the kernel logs, which command should we use?

To check information related to the memory, computer, and network, which command should we use?

To check information related to the memory, computer, and network, which command should we use?

Converts a virtual address to the corresponding symbol

**(Select all that apply.)** What does the `sym` command do? 



(Select all that apply.) What does the <code>sym</code> command do?

**(Select all that apply.)** Let's suppose that a memory address `<addr>` is identified with the symbol `addr1`. Which commands will disassemble the instructions starting with this address?

(Select all that apply.) Let’s suppose that a memory address <code>&lt;addr&gt;</code> is identified with the symbol <code>addr1</code>. Which commands will disassemble the instructions starting with this address?

Test your knowledge of kernel dump analysis with crash.

Getting Started

Fundamentals of Core Dump Analysis

Using GDB With Multi-Threaded Applications

Null Pointer Patterns and External Debugging Information

Spiking Threads

Heap Corruption

Stack Corruption and Overflow

Active Threads

Runtime Exceptions and Execution Residues

Heap Errors

Deadlocks

Post-processing

Kernel Dump Analysis with Crash

Wrapping Up

Appendix

Quiz: Kernel Dump Analysis with Crash