Made a modpack (Well Rounded Blockheads, in case the modlist on curseforge helps) and server to host it, worked fine until last night. The issue that pops up after some days being up/working is when you leave a world (singleplayer) or shutdown a server, the process hangs and jumps to 8.5gb ram used, eats up CPU usage (50-60% in taskman on a 3800x) and just sits there. If done on a single player world, the game doesnt fully crash, (e.g. if you alt+f4 buttons like save and quit, options stay in the window, are still clickable but they do nothing) Saving seems to still happen, as location/inventory updates if I restart server or client and play the world again.
If I start the currently afflicted server but dont login the server closes properly, its only once I log back in the problem occurs. Its a priv server and I dont have anyone else to test atm so Idk if its a prob with my player or players/area in general.
Only recent changes in game are the additions of a pnuematicraft pressure chamber, an enchanting table, and bookshelves from builders crafts and additions....
I've been trying to get help on this all day, so ANY assistance goes a long way, even if its a way to debug this myself >~<
Debug/Latest logs