Steps to reproduce:
- change something in the MediaWiki code on mwdeploy
- run scap pull on one of the mwdebug hosts
- use X-Wikimedia-Debug to send a request to that host
Usually you get a white screen of death and a logstash error saying the request timed out after 60 seconds. The next request will still be somewhat slow but work, and requests after that will be fine.
This behavior has started recently (1-2 months ago?).