Bug Root Cause Tracing

Overview

Bugs often manifest deep in the call stack — wrong directory, bad parameter, corrupted data — far from where the invalid value originated. Fixing where the error appears treats the symptom. Tracing backward to find the original trigger fixes the cause.

Core principle: Never fix where the error surfaces. Trace back until you find what actually caused it.

systematic-debugging
  -> bug-root-cause-tracing  (you are here, when root cause is unclear/deep)
       -> trace backward to original trigger
       -> fix at source
       -> test-driven-development / manual-testing  (prove original symptom)
       -> bug-protection-multi-layered              (if class can recur)
       -> verification-before-completion

When to Use