Tailscale Traces Outage to SQLite WAL Bug

This is a powerful reminder that mature infrastructure can hide extraordinarily narrow failure modes for years.

• –The bug required concurrent writes and checkpointing across multiple connections in WAL mode
• –Tailscale’s production incidents helped expose a failure SQLite’s own tests could not reproduce organically
• –Developers using SQLite in production should verify their runtime version and upgrade to a patched release
• –The incident reinforces the value of replication, backups, and corruption detection even with highly trusted databases
• –SQLite’s simplicity remains compelling, but concurrency-heavy deployments need careful operational safeguards