Weekly Incident · Nov 9, 2026
The job that two workers both completed
A queue retry races with another worker and applies the same side effect twice.
A curated Buglyst lab with executable checks. Fictional scenario; no live production system.
Your investigation
Reconstruct two workers acting on the same delivery.
A single queued job creates duplicate downstream notifications during retry or concurrency.
- Inspect the incident evidence and files. Reproduce the failure.
- Fix the cause. Run Checks, then Submit for private validation.
- Return here for the free debrief and a different exercise using the same skill.
This multi-file lab is free with an account. Want a shorter first try? Try a guest lab.
The debrief
Accept a fix in this incident using your Practice account, then return here. The debrief is free; Run Checks alone does not unlock it.
Build toward your next incident with a shorter daily rep. Continue Debugging Season.
One investigation at a time
The next curated edition is scheduled for Nov 16, 2026 (UTC). Bookmark Weekly Incident for the latest brief.
Each edition has a permanent link. No time limit, streak requirement or paid pass.