07548192b1
Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing CraftBukkit Changes: cc7edd6bc SPIGOT-7051: Worldgen API does not run vanilla noise generation when shouldGenerateNoise is true
73 lines
4 KiB
Diff
73 lines
4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Sat, 18 Apr 2020 04:36:11 -0400
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Subject: [PATCH] Fix Chunk Post Processing deadlock risk
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See: https://gist.github.com/aikar/dd22bbd2a3d78a2fd3d92e95e9f28dc6
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as part of post processing a chunk, we can call ChunkConverter.
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ChunkConverter then kicks off major physics updates, and when blocks
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that have connections across chunk boundaries occur, a recursive risk
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can occur where A updates a block that triggers a physics request.
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That physics request may trigger a chunk request, that then enqueues
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a task into the Mailbox ChunkTaskQueueSorter.
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If anything requests that same chunk that is in the middle of conversion,
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it's mailbox queue is going to be held up, so the subsequent chunk request
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will be unable to proceed.
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We delay post processing of Chunk.A() 1 "pass" by re stuffing it back into
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the executor so that the mailbox ChunkQueue is now considered empty.
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This successfully fixed a reoccurring and highly reproducible crash
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for heightmaps.
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diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
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index 42645114b270b1e7c2b3112abd7eaa90d0e4451c..6354b100499b277c0949c65d454e84da6bce6aa8 100644
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--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
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+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
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@@ -182,6 +182,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
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};
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// CraftBukkit end
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+ final CallbackExecutor chunkLoadConversionCallbackExecutor = new CallbackExecutor(); // Paper
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// Paper start - distance maps
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private final com.destroystokyo.paper.util.misc.PooledLinkedHashSets<ServerPlayer> pooledLinkedPlayerHashSets = new com.destroystokyo.paper.util.misc.PooledLinkedHashSets<>();
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@@ -1026,16 +1027,15 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
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});
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CompletableFuture<Either<LevelChunk, ChunkHolder.ChunkLoadingFailure>> completablefuture1 = completablefuture.thenApplyAsync((either) -> {
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return either.mapLeft((list) -> {
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- return (LevelChunk) list.get(list.size() / 2);
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- });
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- }, (runnable) -> {
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- this.mainThreadMailbox.tell(ChunkTaskPriorityQueueSorter.message(holder, runnable));
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- }).thenApplyAsync((either) -> {
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- return either.ifLeft((chunk) -> {
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+ // Paper start - revert 1.18.2 diff
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+ final LevelChunk chunk = (LevelChunk) list.get(list.size() / 2);
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chunk.postProcessGeneration();
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this.level.startTickingChunk(chunk);
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+ return chunk;
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});
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- }, this.mainThreadExecutor);
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+ }, (runnable) -> {
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+ this.mainThreadMailbox.tell(ChunkTaskPriorityQueueSorter.message(holder, () -> ChunkMap.this.chunkLoadConversionCallbackExecutor.execute(runnable))); // Paper - delay running Chunk post processing until outside of the sorter to prevent a deadlock scenario when post processing causes another chunk request.
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+ }); // Paper end - revert 1.18.2 diff
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completablefuture1.thenAcceptAsync((either) -> {
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either.ifLeft((chunk) -> {
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diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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index 509b2ee115584ce80717cc12a7ab548d103b4b92..42b4214a1319691e9a6cb0c5fafaeeff821f3f99 100644
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--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
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@@ -1138,6 +1138,7 @@ public class ServerChunkCache extends ChunkSource {
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return super.pollTask() || execChunkTask; // Paper
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}
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} finally {
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+ chunkMap.chunkLoadConversionCallbackExecutor.run(); // Paper - Add chunk load conversion callback executor to prevent deadlock due to recursion in the chunk task queue sorter
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chunkMap.callbackExecutor.run();
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}
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// CraftBukkit end
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