Redis::InheritedError (Tried to use a connection from a child process without reconnecting ...

Created by: dzaporozhets

Started GET "/admin" for 127.0.0.1 at 2012-11-20 14:50:06 +0000
Processing by Admin::DashboardController#index as HTML
Completed 500 Internal Server Error in 3ms

Redis::InheritedError (Tried to use a connection from a child process without reconnecting. You need to reconnect to Redis after forking.):
  app/controllers/admin/dashboard_controller.rb:3:in `index'

Version: master, ed92cfde

Appeared after #1981. Reproduce: randomly