After upgrade to v8.9.6 got fatal error:

Started GET "/users/sign_in" for 213.239.198.179 at 2016-08-19 12:49:45 +0300
Processing by SessionsController#new as */*
Completed 500 Internal Server Error in 39ms (ActiveRecord: 0.4ms)

ActionView::Template::Error (undefined method `user_omniauth_authorize_path' for #<#<Class:0x0000080d606f20>:0x0000081d16b4b0>):
    1: = form_tag(user_omniauth_authorize_path("crowd"), id: 'new_crowd_user' ) do
    2:   = text_field_tag :username, nil, {class: "form-control top", placeholder: "Username", autofocus: "autofocus"}
    3:   = password_field_tag :password, nil, {class: "form-control bottom", placeholder: "Password"}
    4:   - if devise_mapping.rememberable?
  app/views/devise/sessions/_new_crowd.html.haml:1:in `_app_views_devise_sessions__new_crowd_html_haml__3245918192574132824_17258311080'
  app/views/devise/shared/_signin_box.html.haml:23:in `_app_views_devise_shared__signin_box_html_haml___1717938267566868456_17293018760'
  app/views/devise/sessions/new.html.haml:4:in `_app_views_devise_sessions_new_html_haml___1076747443708209319_17292267440'
  app/controllers/sessions_controller.rb:24:in `new'
  lib/gitlab/middleware/go.rb:16:in `call'

I think it may be related with rubygem-omniauth-* versions.

# pkg info|grep -i omni
rubygem-gitlab_omniauth-ldap-1.2.1 LDAP strategy for OmniAuth
rubygem-omniauth-1.3.1         Generalized Rack framework for multiple-provider authentication
rubygem-omniauth-auth0-1.4.1   Authentication broker supporting different identity providers
rubygem-omniauth-azure-oauth2-0.0.6 Azure OAuth2 Strategy for OmniAuth
rubygem-omniauth-bitbucket-0.0.2 OmniAuth strategy for Bitbucket
rubygem-omniauth-cas3-1.1.3    CAS 3.0 Strategy for OmniAuth
rubygem-omniauth-facebook-3.0.0 Facebook OAuth2 Strategy for OmniAuth
rubygem-omniauth-github-1.1.2  Official OmniAuth strategy for GitHub
rubygem-omniauth-gitlab-1.0.2  OmniAuth strategy for GitLab
rubygem-omniauth-google-oauth2-0.4.1 Google OAuth2 strategy for OmniAuth 1.x
rubygem-omniauth-oauth-1.1.0   Generic OAuth strategy for OmniAuth
rubygem-omniauth-oauth2-1.4.0  Abstract OAuth2 strategy for OmniAuth
rubygem-omniauth-saml-1.6.0    OmniAuth strategy for SAML
rubygem-omniauth-shibboleth-1.2.1 OmniAuth Shibboleth strategies for OmniAuth 1.x
rubygem-omniauth-twitter-1.2.1 OmniAuth strategy for Twitter
rubygem-omniauth_crowd-2.2.3   OmniAuth provider for Atlassian Crowds REST API

BTW, don't you think that current version binding is broken? rubygem-* ports can update in any time, and it breaks gitlab. In practice, gitlab breaks after every update of rubygem-* ports. I suggest to move to bundler for stability.