From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Thu, 18 Feb 2021 20:23:28 +0000
Subject: [PATCH] misc debugging dumps


diff --git a/src/main/java/io/papermc/paper/util/TraceUtil.java b/src/main/java/io/papermc/paper/util/TraceUtil.java
new file mode 100644
index 0000000000000000000000000000000000000000..2d5494d2813b773e60ddba6790b750a9a08f21f8
--- /dev/null
+++ b/src/main/java/io/papermc/paper/util/TraceUtil.java
@@ -0,0 +1,18 @@
+package io.papermc.paper.util;
+
+import org.bukkit.Bukkit;
+
+public final class TraceUtil {
+
+    public static void dumpTraceForThread(Thread thread, String reason) {
+        Bukkit.getLogger().warning(thread.getName() + ": " + reason);
+        StackTraceElement[] trace = thread.getStackTrace();
+        for (StackTraceElement traceElement : trace) {
+            Bukkit.getLogger().warning("\tat " + traceElement);
+        }
+    }
+
+    public static void dumpTraceForThread(String reason) {
+        new Throwable(reason).printStackTrace();
+    }
+}
diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
index b27256d251e5db5781197319f79f89cc7638c80b..043541d0c93ed7c06c2c01fe6065dd57dd4c0916 100644
--- a/src/main/java/net/minecraft/commands/Commands.java
+++ b/src/main/java/net/minecraft/commands/Commands.java
@@ -341,7 +341,7 @@ public class Commands {
         } catch (Exception exception) {
             MutableComponent ichatmutablecomponent = Component.literal(exception.getMessage() == null ? exception.getClass().getName() : exception.getMessage());
 
-            if (Commands.LOGGER.isDebugEnabled()) {
+            if (commandlistenerwrapper.getServer().isDebugging() || Commands.LOGGER.isDebugEnabled()) { // Paper - Debugging
                 Commands.LOGGER.error("Command exception: /{}", s, exception);
                 StackTraceElement[] astacktraceelement = exception.getStackTrace();
 
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 3f33f6764665e79433226ebe495bf4cfa8100123..b61dd9730ed56fc0c1a10f9c4e0a9630bb668206 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -918,6 +918,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
     // CraftBukkit start
     private boolean hasStopped = false;
     public volatile boolean hasFullyShutdown = false; // Paper
+    private boolean hasLoggedStop = false; // Paper - Debugging
     private final Object stopLock = new Object();
     public final boolean hasStopped() {
         synchronized (this.stopLock) {
@@ -932,6 +933,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             if (this.hasStopped) return;
             this.hasStopped = true;
         }
+        if (!hasLoggedStop && isDebugging()) io.papermc.paper.util.TraceUtil.dumpTraceForThread("Server stopped"); // Paper - Debugging
         // Paper start - kill main thread, and kill it hard
         shutdownThread = Thread.currentThread();
         org.spigotmc.WatchdogThread.doStop(); // Paper
@@ -1032,6 +1034,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
     }
     public void safeShutdown(boolean waitForShutdown, boolean isRestarting) {
         this.isRestarting = isRestarting;
+        this.hasLoggedStop = true; // Paper - Debugging
+        if (isDebugging()) io.papermc.paper.util.TraceUtil.dumpTraceForThread("Server stopped"); // Paper - Debugging
         // Paper end
         this.running = false;
         if (waitForShutdown) {
diff --git a/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java
index 04a728a16bb629adbae1cd8586764a6dbc22b5dc..d130f843975236018df4fa2ccc3ca6aaca7a06b8 100644
--- a/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java
@@ -131,6 +131,11 @@ public class ServerConfigurationPacketListenerImpl extends ServerCommonPacketLis
             this.connection.resumeInboundAfterProtocolChange();
         } catch (Exception exception) {
             ServerConfigurationPacketListenerImpl.LOGGER.error("Couldn't place player in world", exception);
+            // Paper start - Debugging
+            if (MinecraftServer.getServer().isDebugging()) {
+                exception.printStackTrace();
+            }
+            // Paper end - Debugging
             this.connection.send(new ClientboundDisconnectPacket(ServerConfigurationPacketListenerImpl.DISCONNECT_REASON_INVALID_DATA));
             this.connection.disconnect(ServerConfigurationPacketListenerImpl.DISCONNECT_REASON_INVALID_DATA);
         }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 363d251c80b7d8585425cab456822fd6cde67f23..2333858596a76ff8dddb014f31ad2a3d7e926baf 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1006,6 +1006,7 @@ public final class CraftServer implements Server {
                 plugin.getDescription().getFullName(),
                 "This plugin is not properly shutting down its async tasks when it is being reloaded.  This may cause conflicts with the newly loaded version of the plugin"
             ));
+            if (console.isDebugging()) io.papermc.paper.util.TraceUtil.dumpTraceForThread(worker.getThread(), "still running"); // Paper - Debugging
         }
         io.papermc.paper.plugin.PluginInitializerManager.reload(this.console); // Paper
         this.loadPlugins();