facebook/hhvm — pull request #2702 by lbogdan (2014-05-18 21:38:33+00:00)
Title: Fixed use of systemlib based session modules (read Redis sessions)

When using systemlib based session modules, ````mod_data```` was not set to true, so on session save ````mod_is_open()```` returned false and the module's ````write()```` handler was not being called and the save failed.

Fixes https://github.com/facebook/hhvm/issues/2177.