One of the conclusions from the recent SessionManager rollout failure [0] was:
"we should have recruited and coordinated testing by developers and users inside and outside of the WMF while the code was only on the beta testing cluster"
SessionManager is back on the WMF beta cluster [1] now after being briefly removed for the 1.27.0-wmf.12 release cycle, so an announcement seems in order. The beta cluster implements a SUL authenticated wiki farm that is completely separate from the Wikimedia production SUL system. Helping test SessionManager there would involve logging in, logging out, creating new user accounts and generally wandering around the wikis doing things you would normally do in production while keeping an eye out for session related issues.
If you spot something (or just think you spotted something) file a Phabricator task with as many details as you can provide and tag it with the #reading-infrastructure-team project. For session related issues getting traces of the headers and cookies used in the requests that are failing is most helpful. You can also poke around in the logging interface [2] to try and find associated error messages.
If you find other bugs, report them in Phabricator too. :)
Also please remember NOT TO USE passwords in the beta cluster that match the passwords you use anywhere else on the planet!
[0]: https://wikitech.wikimedia.org/wiki/Incident_documentation/20160123-SessionM... [1]: http://deployment.wikimedia.beta.wmflabs.org/wiki/Main_Page [2]: https://logstash-beta.wmflabs.org/#/dashboard/elasticsearch/default
Bryan