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89d51d5f29
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable. It should be noted that this decision does not promise all future exploits will be configurable.
63 lines
3.9 KiB
Diff
63 lines
3.9 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sat, 12 Mar 2022 06:31:13 -0800
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Subject: [PATCH] Fix swamp hut cat generation deadlock
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The worldgen thread will attempt to get structure references
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via the world's getChunkAt method, which is fine if the gen is
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not cancelled - but if the chunk was unloaded, the call will block
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indefinitely. Instead of using the world state, we use the already
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supplied ServerLevelAccessor which will always have the chunk available.
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diff --git a/src/main/java/net/minecraft/world/entity/animal/Cat.java b/src/main/java/net/minecraft/world/entity/animal/Cat.java
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index 534630b0161c8d869e49e7a59572193550be0671..7dfd2b17e82a80683af28779d0bd8f64a909c3b6 100644
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--- a/src/main/java/net/minecraft/world/entity/animal/Cat.java
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+++ b/src/main/java/net/minecraft/world/entity/animal/Cat.java
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@@ -364,7 +364,7 @@ public class Cat extends TamableAnimal implements VariantHolder<CatVariant> {
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});
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ServerLevel worldserver = world.getLevel();
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- if (worldserver.structureManager().getStructureWithPieceAt(this.blockPosition(), StructureTags.CATS_SPAWN_AS_BLACK).isValid()) {
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+ if (worldserver.structureManager().getStructureWithPieceAt(this.blockPosition(), StructureTags.CATS_SPAWN_AS_BLACK, world).isValid()) { // Paper - Fix swamp hut cat generation deadlock
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this.setVariant((CatVariant) BuiltInRegistries.CAT_VARIANT.getOrThrow(CatVariant.ALL_BLACK));
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this.setPersistenceRequired();
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}
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diff --git a/src/main/java/net/minecraft/world/level/StructureManager.java b/src/main/java/net/minecraft/world/level/StructureManager.java
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index b33a015b834873f279bf33a64974ef440a37df79..b59581b92aed0bc1b09008c695b0b112c3e65743 100644
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--- a/src/main/java/net/minecraft/world/level/StructureManager.java
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+++ b/src/main/java/net/minecraft/world/level/StructureManager.java
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@@ -44,7 +44,12 @@ public class StructureManager {
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}
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public List<StructureStart> startsForStructure(ChunkPos pos, Predicate<Structure> predicate) {
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- Map<Structure, LongSet> map = this.level.getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_REFERENCES).getAllReferences();
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+ // Paper start - Fix swamp hut cat generation deadlock
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+ return this.startsForStructure(pos, predicate, null);
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+ }
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+ public List<StructureStart> startsForStructure(ChunkPos pos, Predicate<Structure> predicate, @Nullable ServerLevelAccessor levelAccessor) {
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+ Map<Structure, LongSet> map = (levelAccessor == null ? this.level : levelAccessor).getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_REFERENCES).getAllReferences();
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+ // Paper end - Fix swamp hut cat generation deadlock
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ImmutableList.Builder<StructureStart> builder = ImmutableList.builder();
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for(Map.Entry<Structure, LongSet> entry : map.entrySet()) {
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@@ -108,13 +113,18 @@ public class StructureManager {
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}
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public StructureStart getStructureWithPieceAt(BlockPos pos, TagKey<Structure> structureTag) {
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+ // Paper start - Fix swamp hut cat generation deadlock
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+ return this.getStructureWithPieceAt(pos, structureTag, null);
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+ }
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+ public StructureStart getStructureWithPieceAt(BlockPos pos, TagKey<Structure> structureTag, @Nullable ServerLevelAccessor levelAccessor) {
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+ // Paper end - Fix swamp hut cat generation deadlock
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Registry<Structure> registry = this.registryAccess().registryOrThrow(Registries.STRUCTURE);
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for(StructureStart structureStart : this.startsForStructure(new ChunkPos(pos), (structure) -> {
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return registry.getHolder(registry.getId(structure)).map((reference) -> {
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return reference.is(structureTag);
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}).orElse(false);
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- })) {
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+ }, levelAccessor)) { // Paper - Fix swamp hut cat generation deadlock
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if (this.structureHasPieceAt(pos, structureStart)) {
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return structureStart;
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}
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