Postmortem: Tauri 2.0 Update Bug Broke Our Desktop App for 10k Users for 3 Hours On October 17, 2024, at 14:22 UTC, our team deployed a routine update to our Tauri 2.0-based desktop application, used by over 10,000 active monthly users. Within 12 minutes, we saw a 100% error rate for app launch, with users unable to access core functionality. The incident lasted 3 hours and 7 minutes, fully resolved by 17:29 UTC. This postmortem details the root cause, our response, and steps we’ve taken to prevent recurrence. Incident Summary Our desktop app, built with Tauri 2.0 (migration completed in September 2024), delivers offline-first project management tools to small teams. The October 17 update included a patch for Tauri’s core IPC handler, intended to fix a minor memory leak in v2.0.1. Post-deployment, all users on v2.0.2 (the new version) saw a blank white screen on launch, with no error logs written to disk. User reports flooded our support channel within 15 minutes of release.…