PaperMC/patches/server/0419-Fix-bell-block-entity-memory-leak.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: giacomo <32515303+giacomozama@users.noreply.github.com>
Date: Sat, 10 Oct 2020 12:15:33 +0200
Subject: [PATCH] Fix bell block entity memory leak

BellBlockEntity has a list of entities (entitiesAtRing) that was not being cleared at the right time, causing leaks whenever a bell would be rung near a crowd of entities.

diff --git a/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
index e1adfd10a2f67687b7123d20d31eb7d059a3e1e3..86dac3f82da065bf79d94da9df192f51ce4665e2 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
@@ -63,6 +63,11 @@ public class BellBlockEntity extends BlockEntity {
 
         if (blockEntity.ticks >= 50) {
             blockEntity.shaking = false;
+            // Paper start - Fix bell block entity memory leak
+            if (!blockEntity.resonating) {
+                blockEntity.nearbyEntities.clear();
+            }
+            // Paper end - Fix bell block entity memory leak
             blockEntity.ticks = 0;
         }
 
@@ -76,6 +81,7 @@ public class BellBlockEntity extends BlockEntity {
                 ++blockEntity.resonationTicks;
             } else {
                 bellEffect.run(world, pos, blockEntity.nearbyEntities);
+                blockEntity.nearbyEntities.clear(); // Paper - Fix bell block entity memory leak
                 blockEntity.resonating = false;
             }
         }
@@ -125,6 +131,7 @@ public class BellBlockEntity extends BlockEntity {
             }
         }
 
+        this.nearbyEntities.removeIf(e -> !e.isAlive()); // Paper - Fix bell block entity memory leak
     }
 
     private static boolean areRaidersNearby(BlockPos pos, List<LivingEntity> hearingEntities) {