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 5df862e026e15e10e2fcc7c5a49e8a8022125579..d15c7ed69068ba5832c92860cae56ff4a96cd398 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -733,11 +733,11 @@ 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 9afe509b3455a7aabd11976fb8a7430d1bce065d..4536632687e71b02d5945cac3816b72ac540935e 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
@@ -273,7 +273,12 @@ 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 717e4bf9f5ee0ec2c3a0b5cc65a50b0f6d649a8d..e1cd7497b1355030bf44b53aa30400604dff9aca 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -986,11 +986,11 @@ 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();