1.19.2 Forge Server running fine for a few minutes, then server freezes

[Nazeren]

I finally have got my forge server to be functional after help from people on this forum, and played on it fine for a day. Now, since I've started playing today, the server runs for 2 minutes, then freezes. In the server stats, the ram goes from normal ram usage, all the way to the max 8 GBs in an instant, then the server freezes til it force crashes itself.

I tried to use Spark debug profiler to figure out what is causing it, but the server freezes and crashes before it can profile the issue, and it can never upload the link for the profile before its frozen and dead.

Here is the latest debug log from the server. Thank you for reading & helping

https://paste.ee/p/kue5n

[warjort]

One of your mods is taking too much time on the server thread.

That's usually because it is "looping" or stuck in a deadlock.

 

Normally I would expect to see that error give the stacktrace showing what is happening on the server thread. Your log does not for some reason?

Quote

6Aug2023 17:45:52.427] [Server Watchdog/ERROR] [net.minecraft.server.dedicated.ServerWatchdog/FATAL]: A single server tick took 64.19 seconds (should be max 0.05)

[16Aug2023 17:46:15.659] [Server Watchdog/ERROR] [net.minecraft.server.dedicated.ServerWatchdog/FATAL]: Considering it to be crashed, server will forcibly shutdown.

 

Usually the only way you can find the problem mod (if the stacktrace does not give a clue) is by experimenting with removing mods until the problem goes away.

Backup your world before removing mods.

 

The things I can see in the log that might give a clue are:

upgradedmobs is trying to create some commands with broken syntax which suggests some incompatibilty with the version you are using?

Quote

[16Aug2023 17:36:57.311] [main/ERROR] [net.minecraft.server.ServerFunctionLibrary/]: Failed to load function upgradedmobs:zombies/dash/bite java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: Whilst parsing command on line 1: Incorrect argument for command at position 18: ...at @s run <--[HERE]

 

Something has broken world generation (jigsaw blocks):

Quote

[16Aug2023 17:40:49.110] [Worker-Main2/WARN] [net.minecraft.world.level.levelgen.structure.pools.JigsawPlacement/]: Empty or non-existent pool: minecraft:

It does not say which mod causes that, but this is a possible cause of your problem.

Broken worldgen can lead to deadlocks (freezes) in the chunk loading when the error is not handled properly.