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Block reading in-world tile entities on worldgen threads

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The returned TE may be in the world, in which case it is unsafe
for the current thread to modify or access its contents.

Fixes https://github.com/PaperMC/Folia/issues/52
This commit is contained in:
Spottedleaf 2023-04-23 07:13:23 -07:00
parent 17a3236927
commit 3a95485043
1 changed files with 24 additions and 0 deletions
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24
patches/server/0020-Block-reading-in-world-tile-entities-on-worldgen-thr.patch Normal file
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@ -0,0 +1,24 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sun, 23 Apr 2023 07:08:26 -0700
Subject: [PATCH] Block reading in-world tile entities on worldgen threads
The returned TE may be in the world, in which case it is unsafe
for the current thread to modify or access its contents.
diff --git a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
index 9a1cffd51aaf97f759a9057aefbf50bd6f5ed028..d5ad8f210cd545bf394f94c443652e6b12091879 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
@@ -82,6 +82,11 @@ public class ImposterProtoChunk extends ProtoChunk {
@Nullable
@Override
public BlockEntity getBlockEntity(BlockPos pos) {
+ // Folia start - block reading possibly in-world block data for worldgen threads
+ if (!this.allowWrites && !io.papermc.paper.util.TickThread.isTickThread()) {
+ return null;
+ }
+ // Folia end - block reading possibly in-world block data for worldgen threads
return this.wrapped.getBlockEntity(pos);
}