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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 5b62b6ebfc1b2a9d4673953c20b12a97c50ef3a5..02ea2b2d5463909663bb599b6ca57198b8513456 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -1281,6 +1281,13 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
public 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())) {
+ LOGGER.error("Illegal ChunkMap::addEntity for world " + this.level.getWorld().getName()
+ + ": " + entity + (this.entityMap.containsKey(entity.getId()) ? " ALREADY CONTAINED (This would have crashed your server)" : ""), new Throwable());
+ return;
+ }
+ // Paper end - ignore and warn about illegal addEntity calls instead of crashing server
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 33cb58e7298e7900dbcd37dbdb21de83bfca6a26..a87782c3cb0a751f532feda0b827d7c7eac163e1 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -2149,7 +2149,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
public void onTrackingStart(Entity entity) {
org.spigotmc.AsyncCatcher.catchOp("entity register"); // Spigot
- ServerLevel.this.getChunkSource().addEntity(entity);
+ // ServerLevel.this.getChunkSource().addEntity(entity); // Paper - ignore and warn about illegal addEntity calls instead of crashing server; moved down below valid=true
if (entity instanceof ServerPlayer entityplayer) {
ServerLevel.this.players.add(entityplayer);
ServerLevel.this.updateSleepingPlayerList();
@@ -2179,6 +2179,7 @@ public class ServerLevel extends Level implements WorldGenLevel {
entity.updateDynamicGameEventListener(DynamicGameEventListener::add);
entity.inWorld = true; // CraftBukkit - Mark entity as in world
entity.valid = true; // CraftBukkit
+ ServerLevel.this.getChunkSource().addEntity(entity); // Paper - ignore and warn about illegal addEntity calls instead of crashing server
// Paper start - Entity origin API
if (entity.getOriginVector() == null) {
entity.setOrigin(entity.getBukkitEntity().getLocation());
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