google bot shows a memory leak in the gitlab worker

Steps to reproduce:

• create a project and mirror http://github.com/ceph/ceph
• use https://pypi.python.org/pypi/github2gitlab to import the ~4,000 pull requests as branches
• wait for the google crawler to visit
• watch the worker use all the available memory until it gets killed by the limit set in config.ru (tried with 2GB instead of the default 250MB: it takes about half an hour to get to to 2GB)

GitLab 7.5.1