1.21.4 + Floodgate Server Crash?

[spookymgmt]

This is a tinfoil hat conspiracy, lets hop into it.

[20:14:46] [User Authenticator #290/INFO]: UUID of player _LeGoose420 is 00000000-0000-0000-0009-01f3e6db40de
[20:14:46] [Server thread/INFO]: [floodgate] Floodgate player logged in as _LeGoose420 joined (UUID: 00000000-0000-0000-0009-01f3e6db40de)
[20:14:56] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-ed05b9a (MC: 1.21.4) ---
[20:14:56] [Watchdog Thread/ERROR]: The server has not responded for 10 seconds! Creating thread dump
[20:14:56] [Watchdog Thread/ERROR]: ------------------------------
[20:14:56] [Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Leaf!):
[20:14:56] [Watchdog Thread/ERROR]: ------------------------------
[20:14:56] [Watchdog Thread/ERROR]: Current Thread: Server thread
[20:14:56] [Watchdog Thread/ERROR]: 	PID: 95 | Suspended: false | Native: false | State: WAITING
[20:14:56] [Watchdog Thread/ERROR]: 	Stack:
[20:14:56] [Watchdog Thread/ERROR]: 		java.base@21.0.6/java.lang.Object.wait0(Native Method)
[20:14:56] [Watchdog Thread/ERROR]: 		java.base@21.0.6/java.lang.Object.wait(Object.java:366)
[20:14:56] [Watchdog Thread/ERROR]: 		java.base@21.0.6/java.lang.Object.wait(Object.java:339)
[20:14:56] [Watchdog Thread/ERROR]: 		io.netty.util.concurrent.DefaultPromise.awaitUninterruptibly(DefaultPromise.java:276)
[20:14:56] [Watchdog Thread/ERROR]: 		io.netty.channel.DefaultChannelPromise.awaitUninterruptibly(DefaultChannelPromise.java:137)
[20:14:56] [Watchdog Thread/ERROR]: 		io.netty.channel.DefaultChannelPromise.awaitUninterruptibly(DefaultChannelPromise.java:30)
[20:14:56] [Watchdog Thread/ERROR]: 		io.netty.util.concurrent.DefaultPromise.syncUninterruptibly(DefaultPromise.java:412)
[20:14:56] [Watchdog Thread/ERROR]: 		io.netty.channel.DefaultChannelPromise.syncUninterruptibly(DefaultChannelPromise.java:125)
[20:14:56] [Watchdog Thread/ERROR]: 		io.netty.channel.DefaultChannelPromise.syncUninterruptibly(DefaultChannelPromise.java:30)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.network.Connection.syncAfterConfigurationChange(Connection.java:328)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.network.Connection.setupInboundProtocol(Connection.java:352)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.players.PlayerList.placeNewPlayer(PlayerList.java:373)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.network.ServerConfigurationPacketListenerImpl.handleConfigurationFinished(ServerConfigurationPacketListenerImpl.java:163)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.network.protocol.configuration.ServerboundFinishConfigurationPacket.handle(ServerboundFinishConfigurationPacket.java:22)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.network.protocol.configuration.ServerboundFinishConfigurationPacket.handle(ServerboundFinishConfigurationPacket.java:8)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:29)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.network.protocol.PacketUtils$$Lambda/0x00007faa8c7bcdb0.run(Unknown Source)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.TickTask.run(TickTask.java:18)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:155)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1474)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:165)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:129)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1455)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1449)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.util.thread.BlockableEventLoop.runAllTasks(BlockableEventLoop.java:118)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1584)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1274)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:298)
[20:14:56] [Watchdog Thread/ERROR]: 		net.minecraft.server.MinecraftServer$$Lambda/0x00007faa88ea6b50.run(Unknown Source)
[20:14:56] [Watchdog Thread/ERROR]: 		java.base@21.0.6/java.lang.Thread.runWith(Thread.java:1596)
[20:14:56] [Watchdog Thread/ERROR]: 		java.base@21.0.6/java.lang.Thread.run(Thread.java:1583)
[20:14:56] [Watchdog Thread/ERROR]: ------------------------------

Notice how a floodgate player joined, and EXACTLY 10 seconds later the server throws an error, threads halt?

Not a coincidence, in every single occasion of my server crashing, it's always the same story.

exactly 10 seconds

[03:50:53] [Server thread/INFO]: [floodgate] Floodgate player logged in as _ThedemonXS joined (UUID: 00000000-0000-0000-0009-01f5f1f683c5)
[03:51:03] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-1b09a21 (MC: 1.21.4) ---
[03:51:03] [Watchdog Thread/ERROR]: The server has not responded for 10 seconds! Creating thread dump

Exactly 10 seconds

[22:55:59] [Server thread/INFO]: [floodgate] Floodgate player logged in as _HenryDanger914 joined (UUID: 00000000-0000-0000-0009-01f4f75cf9a5)
[22:56:09] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-1b09a21 (MC: 1.21.4) ---

Exactly 10 seconds

[23:29:21] [Server thread/INFO]: [floodgate] Floodgate player logged in as _HenryDanger914 joined (UUID: 00000000-0000-0000-0009-01f4f75cf9a5)
[23:29:31] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-1b09a21 (MC: 1.21.4) ---

Exactly 10 seconds

[20:14:46] [Server thread/INFO]: [floodgate] Floodgate player logged in as _LeGoose420 joined (UUID: 00000000-0000-0000-0009-01f3e6db40de)
[20:14:56] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-ed05b9a (MC: 1.21.4) ---

Exactly 10 seconds

[23:24:16] [User Authenticator #58/INFO]: UUID of player _Isaiahroy1050 is 00000000-0000-0000-0009-01f1ae752db7
[23:24:26] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-ed05b9a (MC: 1.21.4) ---

You get the point lol

While scanning the repo I found dis

Sorry back to the 10 second thing

Floodgate/spigot/src/main/java/org/geysermc/floodgate/pluginmessage/SpigotSkinApplier.java

Line 62 in 0e3163c

versionSpecificMethods.schedule(

 private void applySkin0(FloodgatePlayer floodgatePlayer, SkinData skinData, boolean firstTry) {
        Player player = Bukkit.getPlayer(floodgatePlayer.getCorrectUniqueId());

        // player is probably not logged in yet
        if (player == null) {
            if (firstTry) {
                versionSpecificMethods.schedule(
                        () -> applySkin0(floodgatePlayer, skinData, false),
                        10 * 20
                );
            }
            return;
        }

Specifically

                versionSpecificMethods.schedule(
                        () -> applySkin0(floodgatePlayer, skinData, false),
                        10 * 20

^^ is that not 200 ticks (10 seconds)??

Is something failing with applying skin? timeout? ratelimit? malformed skin? something?

:insert cat picture:

pls someone save me

[spookymgmt]

Actually, I just realized

[03:50:53] [Server thread/INFO]: [floodgate] Floodgate player logged in as _ThedemonXS joined (UUID: 00000000-0000-0000-0009-01f5f1f683c5)
[03:51:03] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - If you think this is a Leaf bug, please report it at https://github.com/Winds-Studio/Leaf/issues - THIS IS NOT A PAPER BUG OR CRASH - 1.21.4-DEV-1b09a21 (MC: 1.21.4) ---
[03:51:03] [Watchdog Thread/ERROR]: The server has not responded for 10 seconds! Creating thread dump

Message at 51:03 states server hasn't responded in 10 seconds, meaning it crashed the same tick the floodgate player joined. Not 10 seconds after.

I'll keep looking

[Tim203]

Have you tried recreating this on Paper? I can't help but noticing that you're using a fork, and we only officially support: Spigot, Paper and Folia.
And yes, that bit of code you mentioned indeed schedules the action to run after 10 seconds. But I'm not sure how this can be causing issues.