While starting up minecraft 1.19, cpu temps reach up to 112 degrees before my pc shuts down. This does not happen with lunar, normal mc or forge.

You probably also want to check your cpu fan and/or any control parameters you have configured since it doesn't seem to working properly? The shutdown because overheating should only be a failsafe.

Pretty sure this is not a fabric bug.
Sounds like one of your mods is looping (100% cpu) due to a bug or misconfiguration?

To find out which mod is looping you can post your logs/latest.log to see if it has any clues.

But likely that won't show anything useful, so you will need to generate a thread dump:
https://www.baeldung.com/java-thread-dump
which will probably mean installing a java jdk to get the tools.

Alternatively, uninstall all your mods and then add them back individually until you find the problem mod.

I ran fabric without any mods so can't be a mod issue.
The thing is fabric doesn't crash it just keeps getting up to 100 degrees, 112 until finally my pc gives up. Attaching the log anyways

latest.log

You probably also want to check your cpu fan and/or any control parameters you have configured since it doesn't seem to working properly? The shutdown because overheating should only be a failsafe.

Yea, I checked hwinfo and nothing seems off with about 60 degrees at idle (normal in summers)

Not only do you not have any mods, you don't have the fabric api installed.
Its a bit strange reporting a bug against a project you are not using. :-)

You do have the fabric loader installed, https://github.com/FabricMC/fabric-loader
but without any mods, it doesn't do very much except change the classloader.
Everything else will be vanilla minecraft.

The log shows nothing except a shutdown 4 seconds after it loads the resource packs.

[21:23:39] [Render thread/INFO]: Created: 256x128x0 minecraft:textures/atlas/mob_effects.png-atlas
[21:23:43] [Render thread/INFO]: Stopping!

I do see this message from vanilla
[21:23:28] [main/INFO]: Building optimized datafixer
which doesn't have a corresponding end log statement, e.g.
[09:13:27] [Worker-Bootstrap-7/INFO] (Minecraft) 4256 Datafixer optimizations took 46116 milliseconds
so that might be a clue the problem is that processing? But that is vanilla minecraft not fabric.
There is a mod that defers this processing: https://www.curseforge.com/minecraft/mc-mods/lazydfu
if you want to try it. But it is just a guess.

A java thread dump is what is really needed to see what is going on.
But if you only have 4 seconds to do it this might be hard to capture?

It does seem strange that the cpu will overheat in just 4 seconds doing whatever it is doing after the resource pack load.
This does lend some weight to it being that background dfu optimization which runs for quite a while during the bootstrap?

Seems like the "Building optimized datafixer" is pretty resource intensive. Even with my beefy system (16 cores and 32GB of RAM), it still takes unusually long:

�[m�[34m[18:29:00]�[m �[32m[Worker-Bootstrap-10/INFO]�[m �[36m(Minecraft)�[m �[0m4256 Datafixer optimizations took 35247 milliseconds

Not only do you not have any mods, you don't have the fabric api installed. Its a bit strange reporting a bug against a project you are not using. :-)

You do have the fabric loader installed, https://github.com/FabricMC/fabric-loader but without any mods, it doesn't do very much except change the classloader. Everything else will be vanilla minecraft.

The log shows nothing except a shutdown 4 seconds after it loads the resource packs.

[21:23:39] [Render thread/INFO]: Created: 256x128x0 minecraft:textures/atlas/mob_effects.png-atlas
[21:23:43] [Render thread/INFO]: Stopping!

I do see this message from vanilla [21:23:28] [main/INFO]: Building optimized datafixer which doesn't have a corresponding end log statement, e.g. [09:13:27] [Worker-Bootstrap-7/INFO] (Minecraft) 4256 Datafixer optimizations took 46116 milliseconds so that might be a clue the problem is that processing? But that is vanilla minecraft not fabric. There is a mod that defers this processing: https://www.curseforge.com/minecraft/mc-mods/lazydfu if you want to try it. But it is just a guess.

A java thread dump is what is really needed to see what is going on. But if you only have 4 seconds to do it this might be hard to capture?

Hm, do you think this is a hw optimization issue or something related to my system. Ill try booting up a linux partition to check if the same thing happens there. Also my bad i shouldve posted this in minecraft bugs but i realised that a literal second after posting it 😅 sorry!

A CPU shouldn't overheat and shut down even at 100% CPU if installed properly, so I would check the CPU cooler is working and probably consider reseating the cooler (take it off, clean off previous thermal paste, apply fresh and reinstall cooler). I had a similar issue in the past that was caused by a bubble in the thermal paste.