← Friday, October 9, 2026Cloud & infraPostmortem
A runaway Durable Object alarm triggered a $10,811 Cloudflare bill
An alarm repeatedly rescheduled itself, producing 6 trillion reads and writes; Cloudflare did not refund the $10,811.41 bill, and the author says they will move projects to self-hosted VPSs. The failure shows how an unbounded serverless loop can turn into a large, uncapped cost.
- What
- - A Durable Object alarm entered an infinite loop and generated a Cloudflare bill of $10,811.41.
- How
- - The alarm kept rescheduling itself, performing 6 trillion reads and writes; Cloudflare had no hard spending limit, and the bill was paid in full.
- Why it matters
- - Unbounded background work can drive unexpected cloud costs, so engineers need safeguards against runaway loops and spending.
Read on serverlesshorrors.com → Hacker News · 24 comments
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