Tag See all →

#rust

2 stories

Banner: a generated configuration file doubling in size and overflowing a fixed-size container in a network proxy

Networking & DNS

Cloudflare's November 18, 2025 outage: what happened and lessons for our own systems

Daniel Tran · Dec 2, 2025 · 9 min read

A summary of Cloudflare's official postmortem for the November 18, 2025 outage: a database permission change doubled a generated feature file, which crossed a hard limit and crashed the proxy. Plus the lessons we are applying to our own config pipelines.

Banner: a Rust hash map with a read lock and a write lock pointing at it at the same time

Programming Languages Bug Report

Rust E0502 updating a HashMap while iterating it, and the clone that hurt

Daniel Tran · Apr 15, 2025 · 10 min read

E0502 stopped us from updating parent totals inside a HashMap loop, so someone cloned the whole map to make it compile. That clone ran every ten seconds over 1.2 million entries. Here is why the borrow checker was right and the fixes that kept memory flat.