Paper/paper-server/patches/sources/net/minecraft/network/protocol/PacketUtils.java.patch

--- a/net/minecraft/network/protocol/PacketUtils.java
+++ b/net/minecraft/network/protocol/PacketUtils.java
@@ -21,6 +_,9 @@
     public static <T extends PacketListener> void ensureRunningOnSameThread(Packet<T> packet, T processor, BlockableEventLoop<?> executor) throws RunningOnDifferentThreadException {
         if (!executor.isSameThread()) {
             executor.executeIfPossible(() -> {
+                packetProcessing.push(processor); // Paper - detailed watchdog information
+                try { // Paper - detailed watchdog information
+                if (processor instanceof net.minecraft.server.network.ServerCommonPacketListenerImpl serverCommonPacketListener && serverCommonPacketListener.processedDisconnect) return; // Paper - Don't handle sync packets for kicked players
                 if (processor.shouldHandleMessage(packet)) {
                     try {
                         packet.handle(processor);
@@ -34,6 +_,12 @@
                 } else {
                     LOGGER.debug("Ignoring packet due to disconnection: {}", packet);
                 }
+                // Paper start - detailed watchdog information
+                } finally {
+                    totalMainThreadPacketsProcessed.getAndIncrement();
+                    packetProcessing.pop();
+                }
+                // Paper end - detailed watchdog information
             });
             throw RunningOnDifferentThreadException.RUNNING_ON_DIFFERENT_THREAD;
         }
@@ -60,4 +_,22 @@
 
         packetListener.fillCrashReport(crashReport);
     }
+
+    // Paper start - detailed watchdog information
+    public static final java.util.concurrent.ConcurrentLinkedDeque<PacketListener> packetProcessing = new java.util.concurrent.ConcurrentLinkedDeque<>();
+    static final java.util.concurrent.atomic.AtomicLong totalMainThreadPacketsProcessed = new java.util.concurrent.atomic.AtomicLong();
+
+    public static long getTotalProcessedPackets() {
+        return totalMainThreadPacketsProcessed.get();
+    }
+
+    public static java.util.List<PacketListener> getCurrentPacketProcessors() {
+        java.util.List<PacketListener> listeners = new java.util.ArrayList<>(4);
+        for (PacketListener listener : packetProcessing) {
+            listeners.add(listener);
+        }
+
+        return listeners;
+    }
+    // Paper end - detailed watchdog information
 }