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d8e07590e3
Paper/patches/server/0239-Add-Early-Warning-Feature-to-WatchDog.patch
Nassim Jahnke d8e07590e3
Updated Upstream (Bukkit/CraftBukkit) 
Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
5dbedae1 PR-864: Fix Registry#match() failing namespaced inputs
49256865 PR-863: Fix boolean PersistentDataType
9f15450b SPIGOT-7195, SPIGOT-7197: Add DataPack API
ebef5b6a Disable InterfaceIsType Checkstyle check
01d577f5 Slight tweak to boolean PersistentDataType javadoc
d2b99e56 PR-857: Add boolean PersistentDataType

CraftBukkit Changes:
2270366cd PR-1196: Test Registry instances more thoroughly
863dacb7a PR-1191: Do not start on pre-release Java 17
1f2dd8e12 SPIGOT-7362: Properly handle null in CraftBlock#blockFaceToNotch()
dbc70bed5 SPIGOT-7195, SPIGOT-7197: Add DataPack API
2023-06-06 11:09:19 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: miclebrick <miclebrick@outlook.com>
Date: Wed, 8 Aug 2018 15:30:52 -0400
Subject: [PATCH] Add Early Warning Feature to WatchDog
Detect when the server has been hung for a long duration, and start printing
thread dumps at an interval until the point of crash.
This will help diagnose what was going on in that time before the crash.
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 274f3a213e60c9b67dbc43c8b53efb676b8bd41e..387c423dfe69a3310f8e7aa3dbb7faafc9501e50 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1052,6 +1052,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
this.status = this.buildServerStatus();
// Spigot start
+ org.spigotmc.WatchdogThread.hasStarted = true; // Paper
Arrays.fill( recentTps, 20 );
long start = System.nanoTime(), curTime, tickSection = start; // Paper - Further improve server tick loop
lastTick = start - TICK_TIME; // Paper
diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
index e6826cd0a596f063e8737dcde3c8c6c5b3f71970..1a2607d1b257cea65c82c661a6b3d46c1526a775 100644
--- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
+++ b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
@@ -197,6 +197,7 @@ public class DedicatedServer extends MinecraftServer implements ServerInterface
// Paper start
paperConfigurations.initializeGlobalConfiguration();
paperConfigurations.initializeWorldDefaultsConfiguration();
+ org.spigotmc.WatchdogThread.doStart(org.spigotmc.SpigotConfig.timeoutTime, org.spigotmc.SpigotConfig.restartOnCrash);
io.papermc.paper.command.PaperCommands.registerCommands(this);
com.destroystokyo.paper.Metrics.PaperMetrics.startMetrics();
com.destroystokyo.paper.VersionHistoryManager.INSTANCE.getClass(); // load version history now
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index cb70820fd96624c2378e98d48ac31a11dc9e25e3..195b3f20617f9ad1e1fa522d138be3b570aa49a4 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -924,6 +924,7 @@ public final class CraftServer implements Server {
@Override
public void reload() {
+ org.spigotmc.WatchdogThread.hasStarted = false; // Paper - Disable watchdog early timeout on reload
this.reloadCount++;
this.configuration = YamlConfiguration.loadConfiguration(this.getConfigFile());
this.commandsConfiguration = YamlConfiguration.loadConfiguration(this.getCommandsConfigFile());
@@ -1013,6 +1014,7 @@ public final class CraftServer implements Server {
this.enablePlugins(PluginLoadOrder.STARTUP);
this.enablePlugins(PluginLoadOrder.POSTWORLD);
this.getPluginManager().callEvent(new ServerLoadEvent(ServerLoadEvent.LoadType.RELOAD));
+ org.spigotmc.WatchdogThread.hasStarted = true; // Paper - Disable watchdog early timeout on reload
}
@Override
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index ddc5f2d9aa7dda6aff132392927e3d7e3674dbff..3ac48dafe2300ff4cf4591569fec9ce4916503cd 100644
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -229,7 +229,7 @@ public class SpigotConfig
SpigotConfig.restartScript = SpigotConfig.getString( "settings.restart-script", SpigotConfig.restartScript );
SpigotConfig.restartMessage = SpigotConfig.transform( SpigotConfig.getString( "messages.restart", "Server is restarting" ) );
SpigotConfig.commands.put( "restart", new RestartCommand( "restart" ) );
- WatchdogThread.doStart( timeoutTime, restartOnCrash );
+ // WatchdogThread.doStart( timeoutTime, restartOnCrash ); // Paper - moved to after paper config initialization
}
public static boolean bungee;
diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
index a9897c494b3dc56d900356d74030359832febbaa..b47d043144c499b1499f6b4be5a16a3f75c9fcb8 100644
--- a/src/main/java/org/spigotmc/WatchdogThread.java
+++ b/src/main/java/org/spigotmc/WatchdogThread.java
@@ -14,6 +14,10 @@ public final class WatchdogThread extends io.papermc.paper.util.TickThread // Pa
private static WatchdogThread instance;
private long timeoutTime;
private boolean restart;
+ private final long earlyWarningEvery; // Paper - Timeout time for just printing a dump but not restarting
+ private final long earlyWarningDelay; // Paper
+ public static volatile boolean hasStarted; // Paper
+ private long lastEarlyWarning; // Paper - Keep track of short dump times to avoid spamming console with short dumps
private volatile long lastTick;
private volatile boolean stopping;
@@ -22,6 +26,8 @@ public final class WatchdogThread extends io.papermc.paper.util.TickThread // Pa
super( "Paper Watchdog Thread" );
this.timeoutTime = timeoutTime;
this.restart = restart;
+ earlyWarningEvery = Math.min(io.papermc.paper.configuration.GlobalConfiguration.get().watchdog.earlyWarningEvery, timeoutTime); // Paper
+ earlyWarningDelay = Math.min(io.papermc.paper.configuration.GlobalConfiguration.get().watchdog.earlyWarningDelay, timeoutTime); // Paper
}
private static long monotonicMillis()
@@ -61,9 +67,18 @@ public final class WatchdogThread extends io.papermc.paper.util.TickThread // Pa
while ( !this.stopping )
{
//
- if ( this.lastTick != 0 && this.timeoutTime > 0 && WatchdogThread.monotonicMillis() > this.lastTick + this.timeoutTime && !Boolean.getBoolean("disable.watchdog")) // Paper - Add property to disable
+ // Paper start
+ Logger log = Bukkit.getServer().getLogger();
+ long currentTime = WatchdogThread.monotonicMillis();
+ if ( this.lastTick != 0 && this.timeoutTime > 0 && currentTime > this.lastTick + this.earlyWarningEvery && !Boolean.getBoolean("disable.watchdog")) // Paper - Add property to disable
{
- Logger log = Bukkit.getServer().getLogger();
+ boolean isLongTimeout = currentTime > lastTick + timeoutTime;
+ // Don't spam early warning dumps
+ if ( !isLongTimeout && (earlyWarningEvery <= 0 || !hasStarted || currentTime < lastEarlyWarning + earlyWarningEvery || currentTime < lastTick + earlyWarningDelay)) continue;
+ if ( !isLongTimeout && MinecraftServer.getServer().hasStopped()) continue; // Don't spam early watchdog warnings during shutdown, we'll come back to this...
+ lastEarlyWarning = currentTime;
+ if (isLongTimeout) {
+ // Paper end
log.log( Level.SEVERE, "------------------------------" );
log.log( Level.SEVERE, "The server has stopped responding! This is (probably) not a Paper bug." ); // Paper
log.log( Level.SEVERE, "If you see a plugin in the Server thread dump below, then please report it to that author" );
@@ -93,30 +108,46 @@ public final class WatchdogThread extends io.papermc.paper.util.TickThread // Pa
}
}
// Paper end
+ } else
+ {
+ log.log(Level.SEVERE, "--- DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH - " + Bukkit.getServer().getVersion() + " ---");
+ log.log(Level.SEVERE, "The server has not responded for " + (currentTime - lastTick) / 1000 + " seconds! Creating thread dump");
+ }
+ // Paper end - Different message for short timeout
log.log( Level.SEVERE, "------------------------------" );
log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" ); // Paper
io.papermc.paper.chunk.system.scheduling.ChunkTaskScheduler.dumpAllChunkLoadInfo(isLongTimeout); // Paper // Paper - rewrite chunk system
WatchdogThread.dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().serverThread.getId(), Integer.MAX_VALUE ), log );
log.log( Level.SEVERE, "------------------------------" );
//
+ // Paper start - Only print full dump on long timeouts
+ if ( isLongTimeout )
+ {
log.log( Level.SEVERE, "Entire Thread Dump:" );
ThreadInfo[] threads = ManagementFactory.getThreadMXBean().dumpAllThreads( true, true );
for ( ThreadInfo thread : threads )
{
WatchdogThread.dumpThread( thread, log );
}
+ } else {
+ log.log(Level.SEVERE, "--- DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH ---");
+ }
+
log.log( Level.SEVERE, "------------------------------" );
+ if ( isLongTimeout )
+ {
if ( this.restart && !MinecraftServer.getServer().hasStopped() )
{
RestartCommand.restart();
}
break;
+ } // Paper end
}
try
{
- sleep( 10000 );
+ sleep( 1000 ); // Paper - Reduce check time to every second instead of every ten seconds, more consistent and allows for short timeout
} catch ( InterruptedException ex )
{
interrupt();
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