Fix for 1.21.11

[StoodMusic58914]

What feature do you want to see added?

Fix some content vulnerabilities and crash vulnerabilities for version 1.21.11:

https://bugs.mojang.com/browse/MC/issues/MC-306658
https://bugs.mojang.com/browse/MC/issues/MC-305388
https://bugs.mojang.com/browse/MC/issues/MC-305196
https://bugs.mojang.com/browse/MC/issues/MC-305040
https://bugs.mojang.com/browse/MC/issues/MC-305123
https://bugs.mojang.com/browse/MC/issues/MC-303685
https://bugs.mojang.com/browse/MC/issues/MC-303684
https://bugs.mojang.com/browse/MC/issues/MC-264187
https://bugs.mojang.com/browse/MC/issues/MC-153831
https://bugs.mojang.com/browse/MC/issues/MC-102774

[StoodMusic58914]

and fix: [16:14:33] [Server thread/ERROR]: Encountered an unexpected exception
java.util.ConcurrentModificationException
at java.base/java.util.HashMap.forEach(HashMap.java:1433) ~[?:?]
at net.minecraft.world.level.storage.DimensionDataStorage.collectDirtyTagsToSave(DimensionDataStorage.java:182) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.world.level.storage.DimensionDataStorage.scheduleSave(DimensionDataStorage.java:142) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.level.ServerLevel.saveLevelData(ServerLevel.java:1640) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.level.ServerLevel.saveIncrementally(ServerLevel.java:1579) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1694) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.dedicated.DedicatedServer.tickServer(DedicatedServer.java:507) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.MinecraftServer.processPacketsAndTick(MinecraftServer.java:1728) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1395) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:395) ~[divinemc-1.21.11.jar:1.21.11-30-e6d50f0]
at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]

[StoodMusic58914]

Server Crash Analysis: java.util.ConcurrentModificationException
Based on the crash report provided, your server crashed due to a java.util.ConcurrentModificationException.
This is a common Java error that occurs when code attempts to iterate over a collection (like a HashMap) while another thread modifies that same collection simultaneously.

1. Root Cause Analysis

   Error Type: java.util.ConcurrentModificationException
   Location: net.minecraft.world.level.storage.DimensionDataStorage.collectDirtyTagsToSave (Line 182)
   Execution Flow:
   The server attempts to save world data incrementally (ServerLevel.saveIncrementally).
   It calls DimensionDataStorage.scheduleSave.
   While collecting "dirty" tags to save (collectDirtyTagsToSave), it uses HashMap.forEach.
   During this iteration, another thread (or part of the same thread) modifies the structure of the Map (adding or removing elements). This invalidates the iterator and throws the exception.

In simple terms: While the server was organizing and preparing to save dimension data (such as custom dimensions or datapack-generated structures), a plugin or internal mechanism modified this data at the same time, causing the save process to crash.

[StoodMusic58914]

Can you upgrade to multithreading?
I found that having only asynchronous multi-threaded corpses and other existing asynchronous ones is not enough!
There is still one CPU thread that is consuming a bit too much
I hope you can also split the tick into multiple threads
Although your server crashes frequently, its performance is the best, and I will continue to use it (1.21.11)

[dan28000]

stop spamming, send divinemc config, try downloading build 29

[StoodMusic58914]

However, version 29 has entity tracking bugs

[StoodMusic58914]

Can you fix these issues?
Fix on 1.21.11/

[dan28000]

However, version 29 has entity tracking bugs

Ten don't use entity tracking

[StoodMusic58914]

Oops
I beg you
Just release a fix update!!!!
Fix all these issues

[StoodMusic58914]

#59
as before