I have a Rails 2.3.2 app running on Apache with Passenger, and recently, the strangest thing has started happening.
Every so often, the app will just stop processing requests entirely and they'll all back up until they time out. Restarting Apache seems to be the only way out. The system is under relatively light load until this happens, at which point it's under no load at all.
I realize this isn't a lot to go on, but how can I even figure out what's causing this? Of note, global queuing is turned on; Ruby is ruby-enterprise-1.8.6-20080610; and Passenger is the version that came with the aforementioned Ruby Enterprise Edition.