Upstash outage, 12 May 2026
Fly.io Upstash Redis Service Distruption
- Started
- Resolved
- 12 May 2026, 13:48 UTC (after 3 h 59 min)
- Impact
- Critical
Last update from Upstash
On May 12th and 13th at various times, a subset of Upstash Redis instances on [Fly.io](http://Fly.io) experienced intermittent hangs and elevated error rates. The Redis process would stall inside a logging syscall - alive but not making progress - which made the issue hard to spot from our usual telemetry. After investigating with Fly's team, we identified the root cause as a bad interaction between a recent guest kernel update on Fly's newer machines and an upstream Cloud Hypervisor bug \([cloud-hypervisor#7672](https://github.com/cloud-hypervisor/cloud-hypervisor/issues/7672)\) affecting log writes from inside the VM. We mitigated by disabling the affected logging paths, and Fly has since...
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