Case Overview
This case was not about shipping a one-off fix. It was about building failure-path test infrastructure first, so that future incidents would be easier to surface and trace.
Symptom
- ordinary tests did not expose failure-path problems early enough
- low-resource and handle-related failures were hard to reproduce safely
- investigation steps were at risk of becoming too manual and person-dependent
Constraints
- exhausting real machine resources directly is costly and risky
- native / Win32 boundary failures had to be surfaced earlier than production incidents
- the result needed to remain useful for future investigations, not just the current one
What We Observed
- Verifier settings such as
Handles,Heaps, andLow Resource Simulation - traces from
!htrace, page heap, and Verifier stop points - the relationship between custom lifecycle logs and verifier-side evidence
How We Narrowed It Down
The work separated what could be understood from normal structured logs and what required Verifier-driven failure-path exposure. That allowed the investigation to move from passive waiting to active fault surfacing on a controlled harness path.
How We Improved It
- built a reusable failure-path testing foundation
- made handle and heap anomalies observable in shorter loops
- organized the observation points so later design review and recurrence prevention could build on them
Services This Case Connects To
This case connects directly to Bug Investigation & Root Cause Analysis for reproducing and tracing difficult failures, and to Technical Consulting & Design Review for deciding how far abnormal-case testing and observation points should be built into the system design.