Debugging Legacy C++ Crashes: Core Dumps, Symbols, addr2line, and GDB Explained

You're on call. A production C++ service just crashed — no logs, no stack trace, just a dead process and maybe a core file. This guide gives you a clear, repeatable workflow to diagnose any crash, even when you're missing debug symbols or working with a stripped legacy binary. Whether you have a core file, a symbol file, an unstripped build, or nothing at all, you will always know the next step. Why This Matters Debugging crashes in legacy C++ systems is notoriously difficult because: Deployment