From 14e444b2fe2042407cbc1c10dd4a4d6d9caba4b8 Mon Sep 17 00:00:00 2001 From: Aikar Date: Sat, 21 Jul 2018 14:27:34 -0400 Subject: [PATCH] Duplicate UUID Resolve Option Due to a bug in https://github.com/PaperMC/Paper/commit/2e29af3df05ec0a383f48be549d1c03200756d24 which was added all the way back in March of 2016, it was unknown (potentially not at the time) that an entity might actually change the seed of the random object. At some point, EntitySquid did start setting the seed. Due to this shared random, this caused every entity to use a Random object with a predictable seed. This has caused entities to potentially generate with the same UUID.... Over the years, servers have had entities disappear, but no sign of trouble because CraftBukkit removed the log lines indicating that something was wrong. We have fixed the root issue causing duplicate UUID's, however we now have chunk files full of entities that have the same UUID as another entity! When these chunks load, the 2nd entity will not be added to the world correctly. If that chunk loads in a different order in the future, then it will reverse and the missing one is now the one added to the world and not the other. This results in very inconsistent entity behavior. This change allows you to recover any duplicate entity by generating a new UUID for it. This also lets you delete them instead if you don't want to risk having new entities added to the world that you previously did not see. But for those who are ok with leaving this inconsistent behavior, you may use WARN or NOTHING options. It is recommended you regenerate the entities, as these were legit entities, and deserve your love. diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java index 92acfa6fb..05509e4fd 100644 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java @@ -454,4 +454,43 @@ public class PaperWorldConfig { log("Bed Search Radius: " + bedSearchRadius); } } + + public enum DuplicateUUIDMode { + SAFE_REGEN, DELETE, NOTHING, WARN + } + public DuplicateUUIDMode duplicateUUIDMode = DuplicateUUIDMode.SAFE_REGEN; + public int duplicateUUIDDeleteRange = 32; + private void repairDuplicateUUID() { + String desiredMode = getString("duplicate-uuid-resolver", "saferegen").toLowerCase().trim(); + duplicateUUIDDeleteRange = getInt("duplicate-uuid-saferegen-delete-range", duplicateUUIDDeleteRange); + switch (desiredMode.toLowerCase()) { + case "regen": + case "regenerate": + case "saferegen": + case "saferegenerate": + duplicateUUIDMode = DuplicateUUIDMode.SAFE_REGEN; + log("Duplicate UUID Resolve: Regenerate New UUID if distant (Delete likely duplicates within " + duplicateUUIDDeleteRange + " blocks)"); + break; + case "remove": + case "delete": + duplicateUUIDMode = DuplicateUUIDMode.DELETE; + log("Duplicate UUID Resolve: Delete Entity"); + break; + case "silent": + case "nothing": + duplicateUUIDMode = DuplicateUUIDMode.NOTHING; + logError("Duplicate UUID Resolve: Do Nothing (no logs) - Warning, may lose indication of bad things happening"); + break; + case "log": + case "warn": + duplicateUUIDMode = DuplicateUUIDMode.WARN; + log("Duplicate UUID Resolve: Warn (do nothing but log it happened, may be spammy)"); + break; + default: + duplicateUUIDMode = DuplicateUUIDMode.WARN; + logError("Warning: Invalid duplicate-uuid-resolver config " + desiredMode + " - must be one of: regen, delete, nothing, warn"); + log("Duplicate UUID Resolve: Warn (do nothing but log it happened, may be spammy)"); + break; + } + } } diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java index 1c1f39524..edae53b82 100644 --- a/src/main/java/net/minecraft/server/Chunk.java +++ b/src/main/java/net/minecraft/server/Chunk.java @@ -1,5 +1,10 @@ package net.minecraft.server; +// Paper start +import com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode; +import java.util.HashMap; +import java.util.UUID; +// Paper end import com.destroystokyo.paper.exception.ServerInternalException; import com.google.common.collect.Maps; import com.google.common.collect.Queues; @@ -41,6 +46,7 @@ public class Chunk implements IChunkAccess { public final World world; public final Map heightMap; public Long scheduledForUnload; // Paper - delay chunk unloads + private static final Logger logger = LogManager.getLogger(); // Paper public final int locX; public final int locZ; private boolean l; @@ -691,6 +697,7 @@ public class Chunk implements IChunkAccess { if (i != this.locX || j != this.locZ) { Chunk.d.warn("Wrong location! ({}, {}) should be ({}, {}), {}", i, j, this.locX, this.locZ, entity); entity.die(); + return; // Paper } int k = MathHelper.floor(entity.locY / 16.0D); @@ -879,6 +886,50 @@ public class Chunk implements IChunkAccess { for (int j = 0; j < i; ++j) { List entityslice = aentityslice[j]; // Spigot + // Paper start + DuplicateUUIDMode mode = world.paperConfig.duplicateUUIDMode; + if (mode == DuplicateUUIDMode.WARN || mode == DuplicateUUIDMode.DELETE || mode == DuplicateUUIDMode.SAFE_REGEN) { + Map thisChunk = new HashMap<>(); + for (Iterator iterator = ((List) entityslice).iterator(); iterator.hasNext(); ) { + Entity entity = iterator.next(); + if (entity.dead || entity.valid) continue; + Entity other = ((WorldServer) world).entitiesByUUID.get(entity.uniqueID); + if (other == null || other.dead || world.getEntityUnloadQueue().contains(other)) { + other = thisChunk.get(entity.uniqueID); + } + + if (mode == DuplicateUUIDMode.SAFE_REGEN && other != null && !other.dead && + !world.getEntityUnloadQueue().contains(other) + && java.util.Objects.equals(other.getSaveID(), entity.getSaveID()) + && entity.getBukkitEntity().getLocation().distance(other.getBukkitEntity().getLocation()) < world.paperConfig.duplicateUUIDDeleteRange + ) { + if (World.DEBUG_ENTITIES) logger.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", deleted entity " + entity + " because it was near the duplicate and likely an actual duplicate. See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about."); + entity.die(); + iterator.remove(); + continue; + } + if (other != null && !other.dead) { + switch (mode) { + case SAFE_REGEN: { + entity.setUUID(UUID.randomUUID()); + if (World.DEBUG_ENTITIES) logger.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", regenerated UUID for " + entity + ". See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about."); + break; + } + case DELETE: { + if (World.DEBUG_ENTITIES) logger.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", deleted entity " + entity + ". See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about."); + entity.die(); + iterator.remove(); + break; + } + default: + if (World.DEBUG_ENTITIES) logger.warn("[DUPE-UUID] Duplicate UUID found used by " + other + ", doing nothing to " + entity + ". See https://github.com/PaperMC/Paper/issues/1223 for discussion on what this is about."); + break; + } + } + thisChunk.put(entity.uniqueID, entity); + } + } + // Paper end // CraftBukkit start List toRemove = new LinkedList<>(); diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java index 8bab03bd0..3e6a36af6 100644 --- a/src/main/java/net/minecraft/server/Entity.java +++ b/src/main/java/net/minecraft/server/Entity.java @@ -2720,6 +2720,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke }); } + public void setUUID(UUID uuid) { a(uuid); } // Paper - OBFHELPER public void a(UUID uuid) { this.uniqueID = uuid; this.au = this.uniqueID.toString(); diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java index 601fe77c5..4df291f0d 100644 --- a/src/main/java/net/minecraft/server/World.java +++ b/src/main/java/net/minecraft/server/World.java @@ -70,7 +70,7 @@ public abstract class World implements IEntityAccess, GeneratorAccess, IIBlockAc } }; // Spigot end - protected final Set g = com.google.common.collect.Sets.newHashSet(); // Paper + protected final Set g = com.google.common.collect.Sets.newHashSet(); public Set getEntityUnloadQueue() { return g; };// Paper - OBFHELPER //public final List tileEntityList = Lists.newArrayList(); // Paper - remove unused list public final List tileEntityListTick = Lists.newArrayList(); private final List c = Lists.newArrayList(); diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java index be475288e..e7dbd730c 100644 --- a/src/main/java/net/minecraft/server/WorldServer.java +++ b/src/main/java/net/minecraft/server/WorldServer.java @@ -37,7 +37,7 @@ public class WorldServer extends World implements IAsyncTaskHandler { private final MinecraftServer server; public EntityTracker tracker; private final PlayerChunkMap manager; - private final Map entitiesByUUID = Maps.newHashMap(); + public final Map entitiesByUUID = Maps.newHashMap(); // Paper public boolean savingDisabled; private boolean J; private int emptyTime; @@ -978,7 +978,7 @@ public class WorldServer extends World implements IAsyncTaskHandler { this.g.remove(entity1); } else { if (!(entity instanceof EntityHuman)) { - if (DEBUG_ENTITIES) { + if (DEBUG_ENTITIES && entity.world.paperConfig.duplicateUUIDMode != com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode.NOTHING) { WorldServer.a.error("Keeping entity {} that already exists with UUID {}", entity1, uuid.toString()); // CraftBukkit // Paper WorldServer.a.error("Deleting duplicate entity {}", entity); // Paper @@ -1009,7 +1009,7 @@ public class WorldServer extends World implements IAsyncTaskHandler { } Entity old = this.entitiesByUUID.put(entity.getUniqueID(), entity); - if (old != null && old.getId() != entity.getId() && old.valid) { + if (old != null && old.getId() != entity.getId() && old.valid && entity.world.paperConfig.duplicateUUIDMode != com.destroystokyo.paper.PaperWorldConfig.DuplicateUUIDMode.NOTHING) { Logger logger = LogManager.getLogger(); logger.error("Overwrote an existing entity " + old + " with " + entity); if (DEBUG_ENTITIES) { -- 2.20.1