Programmer DD

Jul 16, 2022 · Operations

How a Lua Bug Crashed Bilibili’s Load Balancer and the Lessons Learned

A detailed post‑mortem of the July 2021 Bilibili outage reveals how a Lua‑induced CPU spike in the OpenResty‑based SLB caused widespread service disruption, the step‑by‑step emergency response, root‑cause analysis, and the subsequent architectural and operational improvements to prevent recurrence.