Yolo it's because of server overload - rsync is still syncing forums. I will terminate it for now and wait for the load to get back to normal (https://freeflarum.com/status).
Is your forum accessible now?
Edit: turns out that cron was eating IO too. It was an unfortunate coincidence that I was rsyncing forums along with cron doing its job (right after clearing lesscache for all forums). Cron uses ionice, which should mitigate this, however we don't use that for rsync (yet). I will wait for dust to settle, and then re-run each task one after another. Since not all forums have been rsynced, you might want to fix them up first - and if that doesn't work, please contact me.
I have now terminated processes that were taking up too much RAM/CPU. I deeply apologize for all the incidents that have happened yesterday and today. Please, let me know if the issue persists.
I am actually considering to create a better status page for FreeFlarum (with incident reports) and a Twitter account for status updates - so that the community stays up-to-date with latest alerts, maintenances and downtime.
