As short as two hours? Then I might be able to trigger it myself with bots I hope.
If r678 seems to be fine after a few hours with lots of players you could try r680. That one is in the "middle" and there will be 50% less snapshots to test every iteration and a lot less code changes to investigate.
Update: The leak might to be related to a timer and map changes. I suspect this change broke it:
http://www.helgeby.net/zrdev/hg/hgwe.../zr/infect.inc (the changes in InfectOnMapStart). The timers doesn't last through map changes (at least they shouldn't) and the handles become invalid, so I just reset them. I don't remember if this is correct or not. But this change also exist in the latest official patch, so I'm not sure. If this really is the cause I'm surprised that no one have reported it.
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