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-rw-r--r--patches/server/0830-Fix-swamp-hut-cat-generation-deadlock.patch62
1 files changed, 62 insertions, 0 deletions
diff --git a/patches/server/0830-Fix-swamp-hut-cat-generation-deadlock.patch b/patches/server/0830-Fix-swamp-hut-cat-generation-deadlock.patch
new file mode 100644
index 0000000000..ae8f7dbdb2
--- /dev/null
+++ b/patches/server/0830-Fix-swamp-hut-cat-generation-deadlock.patch
@@ -0,0 +1,62 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+Date: Sat, 12 Mar 2022 06:31:13 -0800
+Subject: [PATCH] Fix swamp hut cat generation deadlock
+
+The worldgen thread will attempt to get structure references
+via the world's getChunkAt method, which is fine if the gen is
+not cancelled - but if the chunk was unloaded, the call will block
+indefinitely. Instead of using the world state, we use the already
+supplied ServerLevelAccessor which will always have the chunk available.
+
+diff --git a/src/main/java/net/minecraft/world/entity/animal/Cat.java b/src/main/java/net/minecraft/world/entity/animal/Cat.java
+index 5ad968a2f1add27da0d6a858e683d5d771128092..e44352857272a2a4027c67bd25a28a9498b7bb49 100644
+--- a/src/main/java/net/minecraft/world/entity/animal/Cat.java
++++ b/src/main/java/net/minecraft/world/entity/animal/Cat.java
+@@ -361,7 +361,7 @@ public class Cat extends TamableAnimal {
+ });
+ ServerLevel worldserver = world.getLevel();
+
+- if (worldserver.structureManager().getStructureWithPieceAt(this.blockPosition(), StructureTags.CATS_SPAWN_AS_BLACK).isValid()) {
++ if (worldserver.structureManager().getStructureWithPieceAt(this.blockPosition(), StructureTags.CATS_SPAWN_AS_BLACK, world).isValid()) { // Paper - fix deadlock
+ this.setCatVariant(CatVariant.ALL_BLACK);
+ this.setPersistenceRequired();
+ }
+diff --git a/src/main/java/net/minecraft/world/level/StructureManager.java b/src/main/java/net/minecraft/world/level/StructureManager.java
+index e7445c1ff0d1e3e989fcd8d3630dd5269a64598d..64ca546a905d69a795bbdafb4f9860b31cd863d1 100644
+--- a/src/main/java/net/minecraft/world/level/StructureManager.java
++++ b/src/main/java/net/minecraft/world/level/StructureManager.java
+@@ -43,7 +43,12 @@ public class StructureManager {
+ }
+
+ public List<StructureStart> startsForStructure(ChunkPos pos, Predicate<Structure> predicate) {
+- Map<Structure, LongSet> map = this.level.getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_REFERENCES).getAllReferences();
++ // Paper start
++ return this.startsForStructure(pos, predicate, null);
++ }
++ public List<StructureStart> startsForStructure(ChunkPos pos, Predicate<Structure> predicate, @Nullable ServerLevelAccessor levelAccessor) {
++ Map<Structure, LongSet> map = (levelAccessor == null ? this.level : levelAccessor).getChunk(pos.x, pos.z, ChunkStatus.STRUCTURE_REFERENCES).getAllReferences();
++ // Paper end
+ ImmutableList.Builder<StructureStart> builder = ImmutableList.builder();
+
+ for(Map.Entry<Structure, LongSet> entry : map.entrySet()) {
+@@ -107,13 +112,18 @@ public class StructureManager {
+ }
+
+ public StructureStart getStructureWithPieceAt(BlockPos pos, TagKey<Structure> structureTag) {
++ // Paper start
++ return this.getStructureWithPieceAt(pos, structureTag, null);
++ }
++ public StructureStart getStructureWithPieceAt(BlockPos pos, TagKey<Structure> structureTag, @Nullable ServerLevelAccessor levelAccessor) {
++ // Paper end
+ Registry<Structure> registry = this.registryAccess().registryOrThrow(Registry.STRUCTURE_REGISTRY);
+
+ for(StructureStart structureStart : this.startsForStructure(new ChunkPos(pos), (structure) -> {
+ return registry.getHolder(registry.getId(structure)).map((holder) -> {
+ return holder.is(structureTag);
+ }).orElse(false);
+- })) {
++ }, levelAccessor)) { // Paper
+ if (this.structureHasPieceAt(pos, structureStart)) {
+ return structureStart;
+ }