# Cloudflare outage caused by bad software deploy (updated)

<https://blog.cloudflare.com/cloudflare-outage/>

- Host: [blog.cloudflare.com](https://links.thingelstad.xyz/hosts/blog.cloudflare.com/)
- Saved: July 8, 2019 (2019-07-08T21:23:56Z)
- Record: https://links.thingelstad.xyz/links/92b0238380a6/
- JSON: https://links.thingelstad.xyz/links/92b0238380a6.json

## What Jamie wrote

Actually caused by a regular expression change.

> Unfortunately, one of these rules contained a regular expression that caused CPU to spike to 100% on our machines worldwide. This 100% CPU spike caused the 502 errors that our customers saw. At its worst traffic dropped by 82%.

Reminds me of that great saying… 

> Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems. ([source](http://regex.info/blog/2006-09-15/247))

🤪

## Facts

- Kind: [Page](https://links.thingelstad.xyz/kinds/page/)

## Same host

- [Introducing Warp: Fixing Mobile Internet Performance and Security](https://links.thingelstad.xyz/links/5ea68aef6793/) (blog.cloudflare.com, April 11, 2019)
- [Introducing time.cloudflare.com](https://links.thingelstad.xyz/links/d84797b7dfc8/) (blog.cloudflare.com, June 25, 2019)
- [How Verizon and a BGP Optimizer Knocked Large Parts of the Internet Offline Today](https://links.thingelstad.xyz/links/8400c598717b/) (blog.cloudflare.com, June 25, 2019)
- [Terminating Service for 8Chan](https://links.thingelstad.xyz/links/3bcbe6b5623d/) (blog.cloudflare.com, August 6, 2019)
- [JavaScript Libraries Are Almost Never Updated Once Installed](https://links.thingelstad.xyz/links/fcc819de6cac/) (blog.cloudflare.com, January 29, 2020)

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## Elsewhere

- Wayback Machine: https://web.archive.org/web/*/https://blog.cloudflare.com/cloudflare-outage/