Whenever a player logs into the server it locks up till it eventually times out and crashes.

latest.log - https://pastebin.com/LbqiffkN & https://pastebin.com/dHHFs0KL
(Two links because it's extra fun size!)
crash report - https://pastebin.com/YPwR4zKz
(probably worthless but just in-case, since it's the only indicator of what mod may have caused the issue I could find.)

Doesn't seem to matter who logs in, it started happening randomly after a couple of days of working fine.

Edit: I should note this started happening prior to the latest version, but also happens on the latest version.

Nevermind, was 7000 stacks of cobble from a cobble generated that'd been running constantly. Sorry to bother.