From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Aikar Date: Sun, 12 Apr 2020 15:50:48 -0400 Subject: [PATCH] Improved Watchdog Support Forced Watchdog Crash support and Improve Async Shutdown If the request to shut down the server is received while we are in a watchdog hang, immediately treat it as a crash and begin the shutdown process. Shutdown process is now improved to also shutdown cleanly when not using restart scripts either. If a server is deadlocked, a server owner can send SIGUP (or any other signal the JVM understands to shut down as it currently does) and the watchdog will no longer need to wait until the full timeout, allowing you to trigger a close process and try to shut the server down gracefully, saving player and world data. Previously there was no way to trigger this outside of waiting for a full watchdog timeout, which may be set to a really long time... Additionally, fix everything to do with shutting the server down asynchronously. Previously, nearly everything about the process was fragile and unsafe. Main might not have actually been frozen, and might still be manipulating state. Or, some reuest might ask main to do something in the shutdown but main is dead. Or worse, other things might start closing down items such as the Console or Thread Pool before we are fully shutdown. This change tries to resolve all of these issues by moving everything into the stop method and guaranteeing only one thread is stopping the server. We then issue Thread Death to the main thread of another thread initiates the stop process. We have to ensure Thread Death propagates correctly though to stop main completely. This is to ensure that if main isn't truely stuck, it's not manipulating state we are trying to save. This also moves all plugins who register "delayed init" tasks to occur just before "Done" so they are properly accounted for and wont trip watchdog on init. diff --git a/src/main/java/com/destroystokyo/paper/Metrics.java b/src/main/java/com/destroystokyo/paper/Metrics.java index e3b74dbdf8e14219a56fab939f3174e0c2f66de6..218f5bafeed8551b55b91c7fccaf6935c8b631ca 100644 --- a/src/main/java/com/destroystokyo/paper/Metrics.java +++ b/src/main/java/com/destroystokyo/paper/Metrics.java @@ -92,7 +92,12 @@ public class Metrics { * Starts the Scheduler which submits our data every 30 minutes. */ private void startSubmitting() { - final Runnable submitTask = this::submitData; + final Runnable submitTask = () -> { + if (MinecraftServer.getServer().hasStopped()) { + return; + } + submitData(); + }; // Many servers tend to restart at a fixed time at xx:00 which causes an uneven distribution of requests on the // bStats backend. To circumvent this problem, we introduce some randomness into the initial and second delay. diff --git a/src/main/java/net/minecraft/CrashReport.java b/src/main/java/net/minecraft/CrashReport.java index bda7137b3435c9b7610be258cefb6b4ac2c1d47a..09f56e49383d3f5413ad4c28f3a7664e4d9570bd 100644 --- a/src/main/java/net/minecraft/CrashReport.java +++ b/src/main/java/net/minecraft/CrashReport.java @@ -231,6 +231,7 @@ public class CrashReport { } public static CrashReport forThrowable(Throwable cause, String title) { + if (cause instanceof ThreadDeath) com.destroystokyo.paper.util.SneakyThrow.sneaky(cause); // Paper while (cause instanceof CompletionException && cause.getCause() != null) { cause = cause.getCause(); } diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java index 44ad235710dce2b159f891d91b7a0d71e5553507..eb82dd9db7fef4b1f0f764ce153439c69c64168b 100644 --- a/src/main/java/net/minecraft/server/MinecraftServer.java +++ b/src/main/java/net/minecraft/server/MinecraftServer.java @@ -301,7 +301,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop processQueue = new java.util.concurrent.ConcurrentLinkedQueue(); public int autosavePeriod; public Commands vanillaCommandDispatcher; - private boolean forceTicks; + public boolean forceTicks; // Paper // CraftBukkit end // Spigot start public static final int TPS = 20; @@ -311,6 +311,9 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop S spin(Function serverFactory) { AtomicReference atomicreference = new AtomicReference(); Thread thread = new Thread(() -> { @@ -908,6 +911,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop {}; + } + // Paper end return new TickTask(this.tickCount, runnable); } @@ -1482,6 +1535,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop { CompletableFuture completablefuture; diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java index 7928fe911f56d28ea8baaf0c15685bce4600f883..449845bc547211fc0568871a60773c713a68a876 100644 --- a/src/main/java/net/minecraft/server/players/PlayerList.java +++ b/src/main/java/net/minecraft/server/players/PlayerList.java @@ -511,7 +511,7 @@ public abstract class PlayerList { this.cserver.getPluginManager().callEvent(playerQuitEvent); entityplayer.getBukkitEntity().disconnect(playerQuitEvent.getQuitMessage()); - entityplayer.doTick(); // SPIGOT-924 + if (server.isSameThread()) entityplayer.doTick(); // SPIGOT-924 // Paper - don't tick during emergency shutdowns (Watchdog) // CraftBukkit end // Paper start - Remove from collideRule team if needed diff --git a/src/main/java/net/minecraft/util/thread/BlockableEventLoop.java b/src/main/java/net/minecraft/util/thread/BlockableEventLoop.java index 7bf4bf5cb2c1b54a7e2733091f48f3a824336d36..dcce05d2f4ab16424db4ab103a12188e207a457b 100644 --- a/src/main/java/net/minecraft/util/thread/BlockableEventLoop.java +++ b/src/main/java/net/minecraft/util/thread/BlockableEventLoop.java @@ -148,6 +148,7 @@ public abstract class BlockableEventLoop implements Profiler try { task.run(); } catch (Exception var3) { + if (var3.getCause() instanceof ThreadDeath) throw var3; // Paper LOGGER.fatal("Error executing task on {}", this.name(), var3); } diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java index af1cee79e27667b78413760286f517c91d1517cb..c84070d05d325a8f49c3918cc112087b9c1074e9 100644 --- a/src/main/java/net/minecraft/world/level/Level.java +++ b/src/main/java/net/minecraft/world/level/Level.java @@ -843,6 +843,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable { try { tickConsumer.accept(entity); } catch (Throwable throwable) { + if (throwable instanceof ThreadDeath) throw throwable; // Paper // Paper start - Prevent tile entity and entity crashes String msg = "Entity threw exception at " + entity.level.getWorld().getName() + ":" + entity.getX() + "," + entity.getY() + "," + entity.getZ(); System.err.println(msg); 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 e19f5d5d58a8b2e4f35907e1c88224cac7f20e57..61c70e17401ec85c0a7e6e1793f6689506b8059a 100644 --- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java +++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java @@ -1319,6 +1319,7 @@ public class LevelChunk implements ChunkAccess { gameprofilerfiller.pop(); } catch (Throwable throwable) { + if (throwable instanceof ThreadDeath) throw throwable; // Paper // Paper start - Prevent tile entity and entity crashes String msg = "TileEntity threw exception at " + LevelChunk.this.getLevel().getWorld().getName() + ":" + this.getPos().getX() + "," + this.getPos().getY() + "," + this.getPos().getZ(); System.err.println(msg); diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java index 2f7ab3142f44c657f3585c8f8a6872fbfac81768..a7d087875ec2d493ef6ed0fcdc03d89445d9008b 100644 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java @@ -1835,7 +1835,7 @@ public final class CraftServer implements Server { @Override public boolean isPrimaryThread() { - return Thread.currentThread().equals(console.serverThread); // Paper - Fix issues with detecting main thread properly + return Thread.currentThread().equals(console.serverThread) || Thread.currentThread().equals(net.minecraft.server.MinecraftServer.getServer().shutdownThread); // Paper - Fix issues with detecting main thread properly, the only time Watchdog will be used is during a crash shutdown which is a "try our best" scenario } // Paper start diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java index 3f219234355edc961f07ae1a75759b6e44ddcfdf..15d6975e6470e1affad9adc73964a720a3de36e9 100644 --- a/src/main/java/org/bukkit/craftbukkit/Main.java +++ b/src/main/java/org/bukkit/craftbukkit/Main.java @@ -12,6 +12,8 @@ import java.util.logging.Level; import java.util.logging.Logger; import joptsimple.OptionParser; import joptsimple.OptionSet; +import net.minecraft.util.ExceptionCollector; +import net.minecraft.world.level.lighting.LayerLightEventListener; import net.minecrell.terminalconsole.TerminalConsoleAppender; // Paper public class Main { @@ -156,6 +158,36 @@ public class Main { OptionSet options = null; + // Paper start - preload logger classes to avoid plugins mixing versions + tryPreloadClass("com.destroystokyo.paper.log.LogFullPolicy"); + tryPreloadClass("org.apache.logging.log4j.core.Core"); + tryPreloadClass("org.apache.logging.log4j.core.Appender"); + tryPreloadClass("org.apache.logging.log4j.core.ContextDataInjector"); + tryPreloadClass("org.apache.logging.log4j.core.Filter"); + tryPreloadClass("org.apache.logging.log4j.core.ErrorHandler"); + tryPreloadClass("org.apache.logging.log4j.core.LogEvent"); + tryPreloadClass("org.apache.logging.log4j.core.Logger"); + tryPreloadClass("org.apache.logging.log4j.core.LoggerContext"); + tryPreloadClass("org.apache.logging.log4j.core.LogEventListener"); + tryPreloadClass("org.apache.logging.log4j.core.AbstractLogEvent"); + tryPreloadClass("org.apache.logging.log4j.message.AsynchronouslyFormattable"); + tryPreloadClass("org.apache.logging.log4j.message.FormattedMessage"); + tryPreloadClass("org.apache.logging.log4j.message.ParameterizedMessage"); + tryPreloadClass("org.apache.logging.log4j.message.Message"); + tryPreloadClass("org.apache.logging.log4j.message.MessageFactory"); + tryPreloadClass("org.apache.logging.log4j.message.TimestampMessage"); + tryPreloadClass("org.apache.logging.log4j.message.SimpleMessage"); + tryPreloadClass("org.apache.logging.log4j.core.async.AsyncLogger"); + tryPreloadClass("org.apache.logging.log4j.core.async.AsyncLoggerContext"); + tryPreloadClass("org.apache.logging.log4j.core.async.AsyncQueueFullPolicy"); + tryPreloadClass("org.apache.logging.log4j.core.async.AsyncLoggerDisruptor"); + tryPreloadClass("org.apache.logging.log4j.core.async.RingBufferLogEvent"); + tryPreloadClass("org.apache.logging.log4j.core.async.DisruptorUtil"); + tryPreloadClass("org.apache.logging.log4j.core.async.RingBufferLogEventHandler"); + tryPreloadClass("org.apache.logging.log4j.core.impl.ThrowableProxy"); + tryPreloadClass("org.apache.logging.log4j.core.impl.ExtendedClassInfo"); + tryPreloadClass("org.apache.logging.log4j.core.impl.ExtendedStackTraceElement"); + // Paper end try { options = parser.parse(args); } catch (joptsimple.OptionException ex) { @@ -255,8 +287,64 @@ public class Main { } catch (Throwable t) { t.printStackTrace(); } + // Paper start + // load some required classes to avoid errors during shutdown if jar is replaced + // also to guarantee our version loads over plugins + tryPreloadClass("com.destroystokyo.paper.util.SneakyThrow"); + tryPreloadClass("com.google.common.collect.Iterators$PeekingImpl"); + tryPreloadClass("com.google.common.collect.MapMakerInternalMap$Values"); + tryPreloadClass("com.google.common.collect.MapMakerInternalMap$ValueIterator"); + tryPreloadClass("com.google.common.collect.MapMakerInternalMap$WriteThroughEntry"); + tryPreloadClass("com.google.common.collect.Iterables"); + for (int i = 1; i <= 15; i++) { + tryPreloadClass("com.google.common.collect.Iterables$" + i, false); + } + tryPreloadClass("org.apache.commons.lang3.mutable.MutableBoolean"); + tryPreloadClass("org.apache.commons.lang3.mutable.MutableInt"); + tryPreloadClass("org.jline.terminal.impl.MouseSupport"); + tryPreloadClass("org.jline.terminal.impl.MouseSupport$1"); + tryPreloadClass("org.jline.terminal.Terminal$MouseTracking"); + tryPreloadClass("co.aikar.timings.TimingHistory"); + tryPreloadClass("co.aikar.timings.TimingHistory$MinuteReport"); + tryPreloadClass("io.netty.channel.AbstractChannelHandlerContext"); + tryPreloadClass("io.netty.channel.AbstractChannelHandlerContext$11"); + tryPreloadClass("io.netty.channel.AbstractChannelHandlerContext$12"); + tryPreloadClass("io.netty.channel.AbstractChannel$AbstractUnsafe$8"); + tryPreloadClass("io.netty.util.concurrent.DefaultPromise"); + tryPreloadClass("io.netty.util.concurrent.DefaultPromise$1"); + tryPreloadClass("io.netty.util.internal.PromiseNotificationUtil"); + tryPreloadClass("io.netty.util.internal.SystemPropertyUtil"); + tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler"); + tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$1"); + tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$2"); + tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$3"); + tryPreloadClass("org.bukkit.craftbukkit.scheduler.CraftScheduler$4"); + tryPreloadClass("org.slf4j.helpers.MessageFormatter"); + tryPreloadClass("org.slf4j.helpers.FormattingTuple"); + tryPreloadClass("org.slf4j.helpers.BasicMarker"); + tryPreloadClass("org.slf4j.helpers.Util"); + tryPreloadClass("com.destroystokyo.paper.event.player.PlayerConnectionCloseEvent"); + tryPreloadClass("com.destroystokyo.paper.event.entity.EntityRemoveFromWorldEvent"); + // Minecraft, seen during saving + tryPreloadClass(LayerLightEventListener.DummyLightLayerEventListener.class.getName()); + tryPreloadClass(LayerLightEventListener.class.getName()); + tryPreloadClass(ExceptionCollector.class.getName()); + // Paper end + } + } + + // Paper start + private static void tryPreloadClass(String className) { + tryPreloadClass(className, true); + } + private static void tryPreloadClass(String className, boolean printError) { + try { + Class.forName(className); + } catch (ClassNotFoundException e) { + if (printError) System.err.println("An expected class " + className + " was not found for preloading: " + e.getMessage()); } } + // Paper end private static List asList(String... params) { return Arrays.asList(params); diff --git a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java index b4a19d80bbf71591f25729fd0e98590350cb31d0..d752720f2f234b9dbd2117333fee1bfad663ec02 100644 --- a/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java +++ b/src/main/java/org/bukkit/craftbukkit/util/ServerShutdownThread.java @@ -12,12 +12,27 @@ public class ServerShutdownThread extends Thread { @Override public void run() { try { + // Paper start - try to shutdown on main + server.safeShutdown(false, false); + for (int i = 1000; i > 0 && !server.hasStopped(); i -= 100) { + Thread.sleep(100); + } + if (server.hasStopped()) { + while (!server.hasFullyShutdown) Thread.sleep(1000); + return; + } + // Looks stalled, close async org.spigotmc.AsyncCatcher.enabled = false; // Spigot org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper + server.forceTicks = true; this.server.close(); + while (!server.hasFullyShutdown) Thread.sleep(1000); + } catch (InterruptedException e) { + e.printStackTrace(); + // Paper end } finally { try { - net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Use TerminalConsoleAppender + //net.minecrell.terminalconsole.TerminalConsoleAppender.close(); // Paper - Move into stop } catch (Exception e) { } } diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java index a142a56a920e153ed84c08cece993f10d76f7793..92d97a5810a379b427a99b4c63fb9844d823a84f 100644 --- a/src/main/java/org/spigotmc/RestartCommand.java +++ b/src/main/java/org/spigotmc/RestartCommand.java @@ -139,7 +139,7 @@ public class RestartCommand extends Command // Paper end // Paper start - copied from above and modified to return if the hook registered - private static boolean addShutdownHook(String restartScript) + public static boolean addShutdownHook(String restartScript) { String[] split = restartScript.split( " " ); if ( split.length > 0 && new File( split[0] ).isFile() ) diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java index 1ffb208094f521883ef0e23baf5fb29380b14273..4d271cae88c16ed2419f896c728fdff612540500 100644 --- a/src/main/java/org/spigotmc/WatchdogThread.java +++ b/src/main/java/org/spigotmc/WatchdogThread.java @@ -12,6 +12,7 @@ import org.bukkit.Bukkit; public class WatchdogThread extends Thread { + public static final boolean DISABLE_WATCHDOG = Boolean.getBoolean("disable.watchdog"); // Paper private static WatchdogThread instance; private long timeoutTime; private boolean restart; @@ -40,6 +41,7 @@ public class WatchdogThread extends Thread { if ( WatchdogThread.instance == null ) { + if (timeoutTime <= 0) timeoutTime = 300; // Paper WatchdogThread.instance = new WatchdogThread( timeoutTime * 1000L, restart ); WatchdogThread.instance.start(); } else @@ -71,12 +73,13 @@ public class WatchdogThread extends Thread // 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 + MinecraftServer server = MinecraftServer.getServer(); + if ( this.lastTick != 0 && this.timeoutTime > 0 && WatchdogThread.hasStarted && (!server.isRunning() || (currentTime > this.lastTick + this.earlyWarningEvery && !DISABLE_WATCHDOG) )) // Paper - add property to disable { - boolean isLongTimeout = currentTime > lastTick + timeoutTime; + boolean isLongTimeout = currentTime > lastTick + timeoutTime || (!server.isRunning() && !server.hasStopped() && currentTime > lastTick + 1000); // 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... + if ( !isLongTimeout && server.hasStopped()) continue; // Don't spam early watchdog warnings during shutdown, we'll come back to this... lastEarlyWarning = currentTime; if (isLongTimeout) { // Paper end @@ -118,7 +121,7 @@ public class WatchdogThread extends Thread log.log( Level.SEVERE, "------------------------------" ); log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Paper!):" ); // Paper com.destroystokyo.paper.io.chunk.ChunkTaskManager.dumpAllChunkLoadInfo(); // Paper - WatchdogThread.dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().serverThread.getId(), Integer.MAX_VALUE ), log ); + WatchdogThread.dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( server.serverThread.getId(), Integer.MAX_VALUE ), log ); log.log( Level.SEVERE, "------------------------------" ); // // Paper start - Only print full dump on long timeouts @@ -138,9 +141,25 @@ public class WatchdogThread extends Thread if ( isLongTimeout ) { - if ( this.restart && !MinecraftServer.getServer().hasStopped() ) + if ( !server.hasStopped() ) { - RestartCommand.restart(); + AsyncCatcher.enabled = false; // Disable async catcher incase it interferes with us + AsyncCatcher.shuttingDown = true; + server.forceTicks = true; + if (restart) { + RestartCommand.addShutdownHook( SpigotConfig.restartScript ); + } + // try one last chance to safe shutdown on main incase it 'comes back' + server.abnormalExit = true; + server.safeShutdown(false, restart); + try { + Thread.sleep(1000); + } catch (InterruptedException e) { + e.printStackTrace(); + } + if (!server.hasStopped()) { + server.close(); + } } break; } // Paper end diff --git a/src/main/resources/log4j2.xml b/src/main/resources/log4j2.xml index 476f4a5cbe664ddd05474cb88553018bd334a5b8..8af159abd3d0cc94cf155fec5b384c42f69551bf 100644 --- a/src/main/resources/log4j2.xml +++ b/src/main/resources/log4j2.xml @@ -1,5 +1,5 @@ - +