1.20.1 The game crashed whilst accessing legacyrandomsource from multiple threads

[Spleen]

Hello people of Forge. When exploring my modded world (around 100 mods) the game regularly crashes for some reason. I've researched and tried to fix but couldn't find a solution for my situation. Also i'm using forge version 47.2.20, and the list of mods i used is in the crash report. Thanks

Crash report: https://pastes.io/btqbxavuef

[TileEntity]

Looks like an issue with bosses_of_mass_destruction - the spawner causing issues

[Spleen]

Damn it was good mod, sad i had to remove it, but it worked and thank you so much for your help! Also, 2 things: do you detect what mod is causing the crash by seeing which mod in the crash report is listed the most? And, this is a random question but, do worldgen mods like tectonic cause less mobs to spawn in vanilla and modded biomes? Again thanks so much for your help.

[TileEntity]

The issue is directly mentioned

 

at net.minecraft.world.level.NaturalSpawner.m_47045_(NaturalSpawner.java:118) ~[client-1.20.1-20230612.114412-srg.jar%23354!/:?] {re:mixin,xf:fml:forge:forge_method_redirector,re:classloading,xf:fml:forge:forge_method_redirector,pl:mixin:APP:mixins.bosses_of_mass_destruction.json:NaturalSpawnerMixin,pl:mixin:A}

Natura is also involved/mentioned - so maybe also try removing natura and add bosses_of_mass_destruction again

 

The spawn rates are usually defined via mods - sometimes spawnrates can be changes at their configs

There is the mod InControl: https://www.curseforge.com/minecraft/mc-mods/in-control

With it, you can change the spawnrates, too 

[Spleen]

Thanks for the response. I don't believe i've installed a mod called natura.

[Spleen]

Um, I created a new world (still using forge) with the same mods as last time but have added make bubbles pop, sinytra connector, forgified fabric api, better end (fabric), and wakes (fabric) and after exploring for 10 seconds my game has crashed with the same error. I assume it is because of sinytra connector because that is the most drastic mod change I have made and the mod is in early beta and is still very buggy.

Crash report:https://pastes.io/eqifxtmn3g

[TileEntity]

Also make a test without supplementaries or snowrealmagic

[Spleen]

It worked! Now I can run my modpack without crashes, thanks!

[PeanutDa]

hi same thing happened to me this is my paste bin please help! 
crash report - https://pastes.io/crash-rep

[TileEntity]

Make a test with adding this mod:

https://www.curseforge.com/minecraft/mc-mods/betterrandomsourceconcurrencycrash

If you have further issues, create an own thread