From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar 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 6159ab8831a233c21aad48c64ef76b06c1955bb0..ee3a5b2f2f1591f68bbacea01b8eafed65c29356 100644 --- a/src/main/java/net/minecraft/server/level/ChunkMap.java +++ b/src/main/java/net/minecraft/server/level/ChunkMap.java @@ -1241,6 +1241,13 @@ 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 f1fa4cb11f69e248dd55b8aa69f5d07268f182a1..89e05d9316b012a5c8103682ff9dbeae757f4f57 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());