Paper/patches/server/0386-Prevent-Double-PlayerChunkMap-adds-crashing-server.patch
2021-06-14 09:38:41 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 2 Apr 2020 01:42:39 -0400
Subject: [PATCH] Prevent Double PlayerChunkMap adds crashing server
Suspected case would be around the technique used in .stopRiding
Stack will identify any causer of this and warn instead of crashing.
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index e1498a5a8e664b922c77a8524ed2ea38c91834ce..71d5c298e14869d9d44226aeb6ffe3f051827d1a 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1467,6 +1467,14 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
protected void addEntity(Entity entity) {
org.spigotmc.AsyncCatcher.catchOp("entity track"); // Spigot
+ // Paper start - ignore and warn about illegal addEntity calls instead of crashing server
+ if (!entity.valid || entity.level != this.level || this.entityMap.containsKey(entity.getId())) {
+ new Throwable("[ERROR] Illegal PlayerChunkMap::addEntity for world " + this.level.getWorld().getName()
+ + ": " + entity + (this.entityMap.containsKey(entity.getId()) ? " ALREADY CONTAINED (This would have crashed your server)" : ""))
+ .printStackTrace();
+ return;
+ }
+ // Paper end
if (!(entity instanceof EnderDragonPart)) {
EntityType<?> entitytypes = entity.getType();
int i = entitytypes.clientTrackingRange() * 16;
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index a43839ddd468d7b61d5609f22fb1e9fcd873590a..da85bfe5de9dcd6d51605ce9b023265b5a5f2936 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -2124,7 +2124,7 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
public void onTrackingStart(Entity entity) {
org.spigotmc.AsyncCatcher.catchOp("entity register"); // Spigot
- ServerLevel.this.getChunkSource().addEntity(entity);
+ // ServerLevel.this.getChunkSource().addEntity(entity); // Paper - moved down below valid=true
if (entity instanceof ServerPlayer) {
ServerLevel.this.players.add((ServerPlayer) entity);
ServerLevel.this.updateSleepingPlayerList();
@@ -2146,6 +2146,7 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
}
entity.valid = true; // CraftBukkit
+ ServerLevel.this.getChunkSource().addEntity(entity);
}
public void onTrackingEnd(Entity entity) {