Fireship: GitHub's Major Issues — Integer Overflow Breaks PR Creation, Copilot Agent Sessions Fail Across Multiple May Outages

Fireship·medium signal

Fireship covers a string of GitHub outages in May 2026: on May 6, a 32-bit integer key overflow in a Vitess lookup table broke PR review thread creation across all shards (mitigated by upgrading to 64-bit); the same day, a config change severed Copilot Cloud Agent sessions; on May 7, Copilot and Code Review Agent sessions continued failing. InfoQ reported GitHub acknowledged 'scaling challenges and architectural weaknesses.'