1 files changed, 74 insertions, 0 deletions
diff --git a/patches/server/0750-Prevent-entity-loading-causing-async-lookups.patch b/patches/server/0750-Prevent-entity-loading-causing-async-lookups.patch
new file mode 100644
index 0000000000..c9ec6cc4c0
--- /dev/null
+++ b/patches/server/0750-Prevent-entity-loading-causing-async-lookups.patch
@@ -0,0 +1,74 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Owen1212055 <[email protected]>
+Date: Sun, 6 Mar 2022 11:09:09 -0500
+Subject: [PATCH] Prevent entity loading causing async lookups
+
+
+diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
+index 3d0f7310840742a5b16f0c0a7115dc0c90202919..45712b358e97b65396f63b34c09debc1d42fdbb9 100644
+--- a/src/main/java/net/minecraft/world/entity/Entity.java
++++ b/src/main/java/net/minecraft/world/entity/Entity.java
+@@ -727,6 +727,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
+ 
+     public void baseTick() {
+         this.level().getProfiler().push("entityBaseTick");
++        if (firstTick && this instanceof net.minecraft.world.entity.NeutralMob neutralMob) neutralMob.tickInitialPersistentAnger(level); // Paper - Prevent entity loading causing async lookups
+         this.feetBlockState = null;
+         if (this.isPassenger() && this.getVehicle().isRemoved()) {
+             this.stopRiding();
+diff --git a/src/main/java/net/minecraft/world/entity/NeutralMob.java b/src/main/java/net/minecraft/world/entity/NeutralMob.java
+index fa64c7baa7587f2cfe80b78ed83be011239618cf..47d5a0928f3c86d71f851738bfe7beedc98cfbb3 100644
+--- a/src/main/java/net/minecraft/world/entity/NeutralMob.java
++++ b/src/main/java/net/minecraft/world/entity/NeutralMob.java
+@@ -42,18 +42,11 @@ public interface NeutralMob {
+                 UUID uuid = nbt.getUUID("AngryAt");
+ 
+                 this.setPersistentAngerTarget(uuid);
+-                Entity entity = ((ServerLevel) world).getEntity(uuid);
+-
+-                if (entity != null) {
+-                    if (entity instanceof Mob) {
+-                        this.setLastHurtByMob((Mob) entity);
+-                    }
+-
+-                    if (entity.getType() == EntityType.PLAYER) {
+-                        this.setLastHurtByPlayer((Player) entity);
+-                    }
+-
+-                }
++                // Paper - Prevent entity loading causing async lookups; Moved diff to separate method
++                // If this entity already survived its first tick, e.g. is loaded and ticked in sync, actively
++                // tick the initial persistent anger.
++                // If not, let the first tick on the baseTick call the method later down the line.
++                if (this instanceof Entity entity && !entity.firstTick) this.tickInitialPersistentAnger(world);
+             }
+         }
+     }
+@@ -127,4 +120,27 @@ public interface NeutralMob {
+ 
+     @Nullable
+     LivingEntity getTarget();
++
++    // Paper start - Prevent entity loading causing async lookups
++    // Update last hurt when ticking
++    default void tickInitialPersistentAnger(Level level) {
++        UUID target = getPersistentAngerTarget();
++        if (target == null) {
++            return;
++        }
++
++        Entity entity = ((ServerLevel) level).getEntity(target);
++
++        if (entity != null) {
++            if (entity instanceof Mob) {
++                this.setLastHurtByMob((Mob) entity);
++            }
++
++            if (entity.getType() == EntityType.PLAYER) {
++                this.setLastHurtByPlayer((Player) entity);
++            }
++
++        }
++    }
++    // Paper end - Prevent entity loading causing async lookups
+ }