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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

**(True or False)** In a multi-threaded application, there can’t be exceptions in multiple threads simultaneously.

(True or False) In a multi-threaded application, there can’t be exceptions in multiple threads simultaneously.

Which command is most helpful to identify the cause of an arithmetic exception?

Which command is most helpful to identify the cause of an arithmetic exception?

It’ll print the currently executing instruction.

Our program threw an arithmetic exception and dumped the core. We’ve loaded the dump in GDB and are examining the problematic thread. What will the `disass $rip` command do?

Our program threw an arithmetic exception and dumped the core. We’ve loaded the dump in GDB and are examining the problematic thread. What will the <code>disass $rip</code> command do?

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: Active Threads