Users take sessions of other users when sessions are stored in memcached (Rails)

Question

I have a very weird problem, when storing my session in Memcached. From time to time some users takes the session of others. E.g. John, becomes logged in as Maria, Maria as

Answer 1

Here it is the code that resolves the problem for me:

I added these lines at the end of

environment.rb

if defined?(PhusionPassenger)
  PhusionPassenger.on_event(:starting_worker_process) do |forked|
    if forked
      CACHE.reset
      if Rails.cache.class == ActiveSupport::Cache::MemCacheStore
        Rails.cache.instance_variable_get(:@data).reset
      end
    end
  end
end