From ce13336d3fb72611127734a52c8e8f07e2c9a558 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 4ba72275b9..572679e4d1 100644 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java @@ -442,4 +442,43 @@ public class PaperWorldConfig { log("Using vanilla redstone algorithm."); } } + + 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 c464d69623..3882e5b2a6 100644 --- a/src/main/java/net/minecraft/server/Chunk.java +++ b/src/main/java/net/minecraft/server/Chunk.java @@ -396,6 +396,7 @@ public class Chunk implements IChunkAccess { if (i != this.loc.x || j != this.loc.z) { Chunk.LOGGER.warn("Wrong location! ({}, {}) should be ({}, {}), {}", i, j, this.loc.x, this.loc.z, entity); entity.dead = true; + return; // Paper } int k = MathHelper.floor(entity.locY() / 16.0D); diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java index 1a20f105b5..d522d7238d 100644 --- a/src/main/java/net/minecraft/server/Entity.java +++ b/src/main/java/net/minecraft/server/Entity.java @@ -2747,6 +2747,7 @@ 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.am = this.uniqueID.toString(); diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java index f640d2ac76..5763538905 100644 --- a/src/main/java/net/minecraft/server/PlayerChunkMap.java +++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java @@ -1,6 +1,7 @@ package net.minecraft.server; import co.aikar.timings.Timing; // Paper +import com.destroystokyo.paper.PaperWorldConfig; // Paper import com.google.common.collect.ImmutableList; import com.google.common.collect.Iterables; import com.google.common.collect.ComparisonChain; // Paper @@ -22,14 +23,17 @@ import java.io.File; import java.io.IOException; import java.io.Writer; import java.util.ArrayList; +import java.util.HashMap; // Paper import java.util.Collection; import java.util.Iterator; import java.util.List; +import java.util.Map; // Paper import java.util.Objects; import java.util.Optional; import java.util.Queue; import java.util.Set; import java.util.concurrent.CancellationException; +import java.util.UUID; // Paper import java.util.concurrent.CompletableFuture; import java.util.concurrent.CompletionException; import java.util.concurrent.Executor; @@ -641,9 +645,9 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { entity.die(); needsRemoval = true; } - - if (!(entity instanceof EntityHuman) && (needsRemoval || !this.world.addEntityChunk(entity))) { - // CraftBukkit end + // CraftBukkit end + checkDupeUUID(entity); // Paper + if (!(entity instanceof EntityHuman) && (entity.dead || !this.world.addEntityChunk(entity))) { // Paper if (list == null) { list = Lists.newArrayList(new Entity[]{entity}); } else { @@ -670,6 +674,44 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d { }); } + // Paper start + private void checkDupeUUID(Entity entity) { + PaperWorldConfig.DuplicateUUIDMode mode = world.paperConfig.duplicateUUIDMode; + if (mode != PaperWorldConfig.DuplicateUUIDMode.WARN + && mode != PaperWorldConfig.DuplicateUUIDMode.DELETE + && mode != PaperWorldConfig.DuplicateUUIDMode.SAFE_REGEN) { + return; + } + Entity other = world.getEntity(entity.uniqueID); + + if (mode == PaperWorldConfig.DuplicateUUIDMode.SAFE_REGEN && other != null && !other.dead + && 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(); + return; + } + 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(); + 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; + } + } + } + // Paper end + public CompletableFuture> a(PlayerChunk playerchunk) { ChunkCoordIntPair chunkcoordintpair = playerchunk.i(); CompletableFuture, PlayerChunk.Failure>> completablefuture = this.a(chunkcoordintpair, 1, (i) -> { diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java index 1221c30a99..ff58e0190e 100644 --- a/src/main/java/net/minecraft/server/WorldServer.java +++ b/src/main/java/net/minecraft/server/WorldServer.java @@ -3,6 +3,8 @@ package net.minecraft.server; import com.google.common.annotations.VisibleForTesting; import co.aikar.timings.TimingHistory; // Paper import co.aikar.timings.Timings; // Paper + +import com.destroystokyo.paper.PaperWorldConfig; // Paper import com.google.common.collect.Lists; import com.google.common.collect.Maps; import com.google.common.collect.Queues; @@ -1060,8 +1062,24 @@ public class WorldServer extends World { if (entity1 == null) { return false; } else { - WorldServer.LOGGER.error("Keeping entity {} that already exists with UUID {}", EntityTypes.getName(entity1.getEntityType()), entity.getUniqueID().toString()); // CraftBukkit // paper + // Paper start + if (entity1.dead) { + unregisterEntity(entity1); // remove the existing entity + return false; + } + // Paper end + WorldServer.LOGGER.error("Keeping entity {} that already exists with UUID {}", entity1, entity.getUniqueID().toString()); // CraftBukkit // paper WorldServer.LOGGER.error("Deleting duplicate entity {}", entity); // CraftBukkit // paper + + // Paper start + if (DEBUG_ENTITIES && entity.world.paperConfig.duplicateUUIDMode != PaperWorldConfig.DuplicateUUIDMode.NOTHING) { + if (entity1.addedToWorldStack != null) { + entity1.addedToWorldStack.printStackTrace(); + } + + getAddToWorldStackTrace(entity).printStackTrace(); + } + // Paper end return true; } } -- 2.25.1