Case Overview
This case follows a Windows application that crashed only after about one month of continuous operation. The important move was not guessing the root cause early, but deciding which observation points had to exist before the cause could be narrowed credibly.
Symptom
- the crash appeared only after long uptime
- the failure shape did not immediately tell whether it was memory, handles, or something else
- reproduction had to be compressed because waiting a month was unrealistic
Constraints
- the problem path involved camera reconnect and abnormal-case behavior
- normal-path logs alone were not enough
- resource growth had to be observed over time, not only at the crash instant
What We Observed
- heartbeat metrics such as
Handle Count,Private Bytes, andThread Count - boundary logs around session start, reconnect, and shutdown
- paired lifecycle logs for create/open/register and close/dispose/unregister
How We Narrowed It Down
Instead of treating it only as a vague long-run crash, the work compressed reproduction around reconnect and failure paths. That made it much more reasonable to treat the problem as a handle-leak investigation rather than a generic crash hunt.
How We Improved It
- strengthened monitoring so growth trends were visible before the final crash
- made ownership boundaries easier to follow in logs
- organized the result so failure-path testing could build on it later
Services This Case Connects To
This case connects to Bug Investigation & Root Cause Analysis for hard-to-reproduce long-run failures, and to Windows App Development for improving logging, reconnect behavior, and operational observability inside the product.