Machine is not staying chunkloaded -> results in client/server crashes upon entering machine

[sesgoe]

Compact Machines version: compactmachines3-1.12.2-3.0.11-b207
Forge version: 14.23.3.2673
I am not using Optifine: Correct
Link to Crashlog: server pseudo crash log here
client crash log upon trying to load into dimension here
Screenshot (if possible): here

This screenshot is showing the minecraft game output that shows reccomplex showing that forge population isn't being triggered, which seems indicative to me of a chunk unloading issue.

Description of the problem including expected versus actual behavior: CM appears to be unloading one of the compact machines I am using around my base. I am currently using two machines:

One has some mekanism stuff in it for power generation, the other is running 6 IC2 nuclear reactors. I consistently crash approx 70-80% of the time I attempt to enter the 2nd machine involving the nuclear reactors. Once I leave the machine, it stops sending power through one of the tunnels, and if I re-enter the machine, the game crashes.

The crash is a slow crash--you go through the dimension transition, and you can then open/close inventory, but the dimension will never load and you are forced to eventually quit/close minecraft.

Steps to reproduce:

Go inside one of my base's compact machines -> this sometimes crashes immediately

If that fails, go inside -> go outside, wait approx 2-3 minutes -> go back inside -> guaranteed crash.

Happy to provide the map files, etc. if anyone is interested in trying to nail down what exactly is causing it. I've given it a few hours of poking around, but I'm not entirely sure of what I'm even looking at yet.

All I know is that ultimately one of my compact machines is not forcing its chunks to be loaded properly and thus crashes the game when you try to enter what I assume is an unloaded area.

This happens in both "load chunks if machine is chunkloaded" and "always keep chunkloaded" CM settings.

[davenonymous]

This looks like an issue in Recurrent Complex and its assumption that dimensions always want World Generation in the first place.
The first message I get when running CM and RC at the same time is this:

[15:53:44] [Server thread/ERROR]: Chunk finished generating without Forge population being triggered (dimension 144). This is a bug with the dimension - please report this to the dimension's author. Recurrent Complex will proceed to generate in compatibility mode.

I intentionally bypass Forge population since version 3.0.11, because there should be no world generation in Compact Machine worlds.

I'll have to dig a bit deeper and reproduce your crashes to be sure.

[Saklad5]

Wait, you bypass world generation entirely? That’s a thing you can do? I thought you just generated empty space.

[sesgoe]

@thraaawn

Let me know what you find out--I'm available later today (~5PM EST) if you need confirmation about any details about my crashes. Happy to help debug as needed.

The odd thing is that I can get inside the compact machine about 30-40% of the time, but it always seems to unload itself within a few minutes of leaving it.

I'll try removing RC around lunch time to see if the crashes stop.

[davenonymous]

I bypass chunk population entirely, yes. It seems to be a bit buggy still 😢
The problem with generating empty space and normal forge population is that other mods can still generate in it, which I don't want them to do since it causes issues like #316.

But I already have an idea and maybe a fix for what's causing this issue.
@sesgoe Could you retry with the latest build 208 please? You can grab it from here

[sesgoe]

@thraaawn
What's the easiest way for me to build it to try it out? Do I need to set up a forge dev environment or can I just build it quickly with gradle?

[davenonymous]

Sorry, I wasn't finished writing the comment when the commit closed the issue and reopening sent what I already wrote. See my previous comment for a download link.

[sesgoe]

@thraaawn
Ohhh--gotcha. I will try this out in approx 30-40 minutes and let you know what happens.

Thanks!

[davenonymous]

Awesome! A bit background info: I couldn't exactly reproduce your issue, but I noticed the CM world got unloaded when it should not. This fix prevents the CM world from being unloaded in the first place, since I assume that's what caused your crashes.

[sesgoe]

That would be my guess on the crashes too--Thanks so much for the quick response, can't wait to try it out!

[davenonymous]

Dude. I just saw this was your first issue ever. Excellent job! And sticking around for retesting. A programmers dream 🥇

I'll try to get behind serious crashes like this as soon as possible, especially with the mod being in some major modpacks since 1.12.

[sesgoe]

I'm actually a software developer by trade, just very little experience with forge, otherwise I would've tried to fix this and just submit a pull request. :)

[sesgoe]

@thraaawn
Update: this appears to have fixed the issue. I am hopping in and out of the machine with no issues, and it's sending power through the tunnel properly as expected.

Thanks so so much. Seems like you can upload the new build to curseforge--I'm using the Enigmatica 2: Expert pack and I know of several people playing it who will likely eventually run into the same issue.

If I run into any more problems I'll open a new issue.