Why am I getting RuntimeError: Session collision on '…?

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I've been getting quite a lot of session collision exceptions. Usually at least one per day, but sometimes I deploy and get 2-3 in a row and then nothing. The app runs on Rails 3.2.2 and unicorn, and sessions are stored in memcached.

The exceptions happen in different places in different controllers and I'm not really able to find anything they have in common. What could be causing this? Ruby-on-rails ruby-on-rails-3 session memcached link|improve this question asked 1 hour agoDarth7,3541258121 83% accept rate.

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