0844-Allow-physics-problem-exceptions.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Noah van der Aa <[email protected]>
Date: Wed, 20 Oct 2021 16:59:21 +0200
Subject: [PATCH] Allow physics problem exceptions


diff --git a/src/main/java/me/noahvdaa/blueprint/util/SuppressedThrowable.java b/src/main/java/me/noahvdaa/blueprint/util/SuppressedThrowable.java
new file mode 100644
index 0000000000000000000000000000000000000000..56306e2a613c335e94ce1412417b0a2efc31b263
--- /dev/null
+++ b/src/main/java/me/noahvdaa/blueprint/util/SuppressedThrowable.java
@@ -0,0 +1,7 @@
+package me.noahvdaa.blueprint.util;
+
+public class SuppressedThrowable extends RuntimeException {
+    public SuppressedThrowable(String reason) {
+        super(reason);
+    }
+}
diff --git a/src/main/java/net/minecraft/network/protocol/PacketUtils.java b/src/main/java/net/minecraft/network/protocol/PacketUtils.java
index c958a00535c0f7a015a7a566b97e2c80fc9a0efd..f731ce08d3e0aecbaaea2636cefed160434dde43 100644
--- a/src/main/java/net/minecraft/network/protocol/PacketUtils.java
+++ b/src/main/java/net/minecraft/network/protocol/PacketUtils.java
@@ -57,6 +57,11 @@ public class PacketUtils {
                     } // Paper - timings
                     // Paper start
                     catch (Exception e) {
+                        // Blueprint start - ignore suppressed throwables
+                        if (e instanceof me.noahvdaa.blueprint.util.SuppressedThrowable || (e instanceof net.minecraft.ReportedException re && e.getCause() instanceof me.noahvdaa.blueprint.util.SuppressedThrowable)) {
+                            return;
+                        }
+                        // Blueprint end
                         Connection networkmanager = listener.getConnection();
                         String playerIP = com.destroystokyo.paper.PaperConfig.logPlayerIpAddresses ? String.valueOf(networkmanager.getRemoteAddress()) : "<ip address withheld>"; // Paper
                         if (networkmanager.getPlayer() != null) {
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 5a4172faaf960d48939d6a485719041987df9242..be10d5df999377b49d0957dd9e6921cd61a08a63 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1624,7 +1624,16 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
 
             try {
                 worldserver.timings.doTick.startTiming(); // Spigot
-                worldserver.tick(shouldKeepTicking);
+                // Blueprint start
+                try {
+                    worldserver.tick(shouldKeepTicking);
+                } catch (ReportedException e) {
+                    if (!(e.getCause() instanceof me.noahvdaa.blueprint.util.SuppressedThrowable)) throw e.getCause();
+                    MinecraftServer.LOGGER.warn("Prevented crash while ticking world: " + e.getCause());
+                } catch (me.noahvdaa.blueprint.util.SuppressedThrowable e) {
+                    MinecraftServer.LOGGER.warn("Prevented crash while ticking world: " + e.getCause());
+                }
+                // Blueprint end
                 // Paper start
                 for (final io.papermc.paper.chunk.SingleThreadChunkRegionManager regionManager : worldserver.getChunkSource().chunkMap.regionManagers) {
                     regionManager.recalculateRegions();
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 9cafd000b3533ed9fd35df2ec880f55e262084fb..5e20167bbb300f8703f9290889242fb1b6982c89 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -814,11 +814,18 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
                 }
                 // CraftBukkit end
                 iblockdata.neighborChanged(this, pos, sourceBlock, neighborPos, false);
-            // Spigot Start
-            } catch (StackOverflowError ex) {
-                Level.lastPhysicsProblem = new BlockPos(pos);
-                // Spigot End
             } catch (Throwable throwable) {
+                // Blueprint start
+                if (throwable instanceof StackOverflowError || throwable instanceof me.noahvdaa.blueprint.util.SuppressedThrowable) {
+                    throw new me.noahvdaa.blueprint.util.SuppressedThrowable("Update suppression");
+                } else {
+                    // Blueprint - Move down spigot catch block
+                    if (throwable instanceof StackOverflowError) {
+                        lastPhysicsProblem = new BlockPos(pos);
+                        return;
+                    }
+                }
+                // Blueprint end
                 CrashReport crashreport = CrashReport.forThrowable(throwable, "Exception while updating neighbours");
                 CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Block being updated");
 

This reenables update suppression, right?

can someone explain to me how to use this in my server? where do i put it, and how do i enable it?

@boxers41
You might want to check out the topic at spigotmc.org

TL;DR
Steps:

1. clone papermc repo
2. gradlew applyPatches
3. Place the patch in the patch folder for Paper
4. gradlew rebuildPatches
5. gradlew applyPatches
6. gradlew reobfJar <- for generating jar file

Where to put patches?

New patch for 1.18.2! See the first post in the thread
https://www.spigotmc.org/threads/how-to-enable-update-suppression-on-spigot-or-paper.530401/