More info:
==> /var/log/gitlab/unicorn/unicorn_stdout.log <==
I, [2018-01-02T16:21:19.086089 #63651] INFO -- omniauth: (github) Callback
phase initiated.
E, [2018-01-02T16:21:19.362203 #63651] ERROR -- omniauth: (github)
Authentication failure! invalid_credentials: OAuth2::Error,
bad_verificat
I have followed the guide
here: https://docs.gitlab.com/ee/integration/github.html
When I get to my Gitlab CE instance, I try logging in with Github. It
briefly says "OAuth Application Authorized" on my Chrome tab, but completes
with an Error 500. Occasionally, I actually get to the screen on G
