Paper/patches/server/0037-Prevent-block-entity-and-entity-crashes.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 1 Mar 2016 23:52:34 -0600
Subject: [PATCH] Prevent block entity and entity crashes


diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 79d5423be919dfe4db75ad7dd0ce403ad0214462..e8b8475dd6fd7b89651f744da2cb9696c73ddc3e 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -731,11 +731,11 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
         try {
             tickConsumer.accept(entity);
         } catch (Throwable throwable) {
-            CrashReport crashreport = CrashReport.forThrowable(throwable, "Ticking entity");
-            CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Entity being ticked");
-
-            entity.fillCrashReportCategory(crashreportsystemdetails);
-            throw new ReportedException(crashreport);
+            // Paper start - Prevent block entity and entity crashes
+            final String msg = String.format("Entity threw exception at %s:%s,%s,%s", entity.level().getWorld().getName(), entity.getX(), entity.getY(), entity.getZ());
+            MinecraftServer.LOGGER.error(msg, throwable);
+            entity.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DISCARD);
+            // Paper end - Prevent block entity and entity crashes
         }
     }
 
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
index 17cda4c8b61efd99c1a43f921ed604827bb064f3..d6ad310d3b472c40c128cfb459171d9f48e50915 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
@@ -272,7 +272,12 @@ public abstract class BlockEntity {
     public void fillCrashReportCategory(CrashReportCategory crashReportSection) {
         crashReportSection.setDetail("Name", this::getNameForReporting);
         if (this.level != null) {
-            CrashReportCategory.populateBlockDetails(crashReportSection, this.level, this.worldPosition, this.getBlockState());
+            // Paper start - Prevent block entity and entity crashes
+            BlockState block = this.getBlockState();
+            if (block != null) {
+                CrashReportCategory.populateBlockDetails(crashReportSection, this.level, this.worldPosition, block);
+            }
+            // Paper end - Prevent block entity and entity crashes
             CrashReportCategory.populateBlockDetails(crashReportSection, this.level, this.worldPosition, this.level.getBlockState(this.worldPosition));
         }
     }
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index 418ba374886d93f69afd614e4be05f6561e1f897..6889991885cc2075e0936b2c480befeef30d308c 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -953,11 +953,11 @@ public class LevelChunk extends ChunkAccess {
 
                         gameprofilerfiller.pop();
                     } catch (Throwable throwable) {
-                        CrashReport crashreport = CrashReport.forThrowable(throwable, "Ticking block entity");
-                        CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Block entity being ticked");
-
-                        this.blockEntity.fillCrashReportCategory(crashreportsystemdetails);
-                        throw new ReportedException(crashreport);
+                        // Paper start - Prevent block entity and entity crashes
+                        final String msg = String.format("BlockEntity threw exception at %s:%s,%s,%s", LevelChunk.this.getLevel().getWorld().getName(), this.getPos().getX(), this.getPos().getY(), this.getPos().getZ());
+                        net.minecraft.server.MinecraftServer.LOGGER.error(msg, throwable);
+                        LevelChunk.this.removeBlockEntity(this.getPos());
+                        // Paper end - Prevent block entity and entity crashes
                         // Spigot start
                     } finally {
                         this.blockEntity.tickTimer.stopTiming();