Debug Failures (Identify Root Cause from Symptoms)

Debug Failures (Root Cause Analysis) You are given a failing behavior (e.g., failing tests, production alerts, crashes on certain inputs, inconsistent outputs) along with some evidence (logs, stack traces, configs, sample inputs, metrics). Task Explain how you would narrow down the issue (reproduce, bisect, controlled experiments). Form hypotheses and describe how to validate/eliminate them. Propose a fix and regression tests. Note: Original details are missing; this is the interview-pattern summary.