mirror of
https://github.com/PaperMC/Paper.git
synced 2024-11-29 14:06:17 +01:00
61 lines
3.3 KiB
Diff
61 lines
3.3 KiB
Diff
|
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Aikar <aikar@aikar.co>
|
||
|
|
Date: Sat, 18 Apr 2020 04:36:11 -0400
|
||
|
|
Subject: [PATCH] Fix Chunk Post Processing deadlock risk
|
||
|
|
|
||
|
|
See: https://gist.github.com/aikar/dd22bbd2a3d78a2fd3d92e95e9f28dc6
|
||
|
|
|
||
|
|
as part of post processing a chunk, we can call ChunkConverter.
|
||
|
|
|
||
|
|
ChunkConverter then kicks off major physics updates, and when blocks
|
||
|
|
that have connections across chunk boundries occur, a recursive risk
|
||
|
|
can occur where A updates a block that triggers a physics request.
|
||
|
|
|
||
|
|
That physics request may trigger a chunk request, that then enqueues
|
||
|
|
a task into the Mailbox ChunkTaskQueueSorter.
|
||
|
|
|
||
|
|
If anything requests that same chunk that is in the middle of conversion,
|
||
|
|
it's mailbox queue is going to be held up, so the subsequent chunk request
|
||
|
|
will be unable to proceed.
|
||
|
|
|
||
|
|
We delay post processing of Chunk.A() 1 "pass" by re stuffing it back into
|
||
|
|
the executor so that the mailbox ChunkQueue is now considered empty.
|
||
|
|
|
||
|
|
This successfully fixed a reoccurring and highly reproduceable crash
|
||
|
|
for heightmaps.
|
||
|
|
|
||
|
|
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
|
||
|
|
index 49728aab7512ea8486d277d34e80d3c6a4727aac..dbe60f5d24fb39be52c3cb8f933371b1626951df 100644
|
||
|
|
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
|
||
|
|
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
|
||
|
|
@@ -181,6 +181,8 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
|
||
|
|
};
|
||
|
|
// CraftBukkit end
|
||
|
|
|
||
|
|
+ final CallbackExecutor chunkLoadConversionCallbackExecutor = new CallbackExecutor(); // Paper
|
||
|
|
+
|
||
|
|
// Paper start - distance maps
|
||
|
|
private final com.destroystokyo.paper.util.misc.PooledLinkedHashSets<ServerPlayer> pooledLinkedPlayerHashSets = new com.destroystokyo.paper.util.misc.PooledLinkedHashSets<>();
|
||
|
|
|
||
|
|
@@ -1054,7 +1056,7 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
|
||
|
|
return Either.left(chunk);
|
||
|
|
});
|
||
|
|
}, (runnable) -> {
|
||
|
|
- this.mainThreadMailbox.tell(ChunkTaskPriorityQueueSorter.message(holder, runnable));
|
||
|
|
+ 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.
|
||
|
|
});
|
||
|
|
|
||
|
|
completablefuture1.thenAcceptAsync((either) -> {
|
||
|
|
diff --git a/src/main/java/net/minecraft/server/level/ServerChunkCache.java b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
|
||
|
|
index 531fe1259a1d60ff69321c3fefbf97f7141e6475..b45fe750c8ca838e1beebff4077e5819eec2836c 100644
|
||
|
|
--- a/src/main/java/net/minecraft/server/level/ServerChunkCache.java
|
||
|
|
+++ b/src/main/java/net/minecraft/server/level/ServerChunkCache.java
|
||
|
|
@@ -1021,6 +1021,7 @@ public class ServerChunkCache extends ChunkSource {
|
||
|
|
return super.pollTask() || execChunkTask; // Paper
|
||
|
|
}
|
||
|
|
} finally {
|
||
|
|
+ chunkMap.chunkLoadConversionCallbackExecutor.run(); // Paper - Add chunk load conversion callback executor to prevent deadlock due to recursion in the chunk task queue sorter
|
||
|
|
chunkMap.callbackExecutor.run();
|
||
|
|
}
|
||
|
|
// CraftBukkit end
|