Large amount of players joining causes crashes.

[Lagggpixel]

I suspect everything is not done on netty threads might be the reason?

Causes the server main thread to be held.

[kireikosasha]

Spark profiler? Or other info?

[Lagggpixel]

All I have to show is the following. This went away as soon as I disabled MX.

[15:03:23] [User Authenticator #2/INFO]: UUID of player Conetic is 41a5a381-9980-3503-b621-b4ba4cc487c5
[15:03:33] [Paper Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH - 1.21.3-67-d38624b (MC: 1.21.3) ---
[15:03:33] [Paper Watchdog Thread/ERROR]: The server has not responded for 10 seconds! Creating thread dump
[15:03:33] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:03:33] [Paper Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Paper!):
[15:03:33] [Paper Watchdog Thread/ERROR]: Handling packet for connection: net.minecraft.server.network.ServerLoginPacketListenerImpl@4d540f50
[15:03:33] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:03:33] [Paper Watchdog Thread/ERROR]: Current Thread: Server thread
[15:03:33] [Paper Watchdog Thread/ERROR]: PID: 74 | Suspended: false | Native: false | State: WAITING
[15:03:33] [Paper Watchdog Thread/ERROR]: Stack:
[15:03:33] [Paper Watchdog Thread/ERROR]: java.base@21.0.6/java.lang.Object.wait0(Native Method)
[15:03:33] [Paper Watchdog Thread/ERROR]: java.base@21.0.6/java.lang.Object.wait(Object.java:366)
[15:03:33] [Paper Watchdog Thread/ERROR]: java.base@21.0.6/java.lang.Object.wait(Object.java:339)
[15:03:33] [Paper Watchdog Thread/ERROR]: io.netty.util.concurrent.DefaultPromise.awaitUninterruptibly(DefaultPromise.java:276)
[15:03:33] [Paper Watchdog Thread/ERROR]: io.netty.channel.DefaultChannelPromise.awaitUninterruptibly(DefaultChannelPromise.java:137)
[15:03:33] [Paper Watchdog Thread/ERROR]: io.netty.channel.DefaultChannelPromise.awaitUninterruptibly(DefaultChannelPromise.java:30)
[15:03:33] [Paper Watchdog Thread/ERROR]: io.netty.util.concurrent.DefaultPromise.syncUninterruptibly(DefaultPromise.java:412)
[15:03:33] [Paper Watchdog Thread/ERROR]: io.netty.channel.DefaultChannelPromise.syncUninterruptibly(DefaultChannelPromise.java:125)
[15:03:33] [Paper Watchdog Thread/ERROR]: io.netty.channel.DefaultChannelPromise.syncUninterruptibly(DefaultChannelPromise.java:30)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.network.Connection.syncAfterConfigurationChange(Connection.java:348)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.network.Connection.setupInboundProtocol(Connection.java:376)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.network.ServerLoginPacketListenerImpl.handleLoginAcknowledgement(ServerLoginPacketListenerImpl.java:464)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.network.protocol.login.ServerboundLoginAcknowledgedPacket.handle(ServerboundLoginAcknowledgedPacket.java:22)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.network.protocol.login.ServerboundLoginAcknowledgedPacket.handle(ServerboundLoginAcknowledgedPacket.java:13)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.network.protocol.PacketUtils.lambda$ensureRunningOnSameThread$0(PacketUtils.java:55)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.network.protocol.PacketUtils$$Lambda/0x00007fc8de6e78f0.run(Unknown Source)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.TickTask.run(TickTask.java:18)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.util.thread.BlockableEventLoop.doRunTask(BlockableEventLoop.java:154)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.util.thread.ReentrantBlockableEventLoop.doRunTask(ReentrantBlockableEventLoop.java:24)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:1577)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.doRunTask(MinecraftServer.java:207)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.util.thread.BlockableEventLoop.pollTask(BlockableEventLoop.java:128)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.pollTaskInternal(MinecraftServer.java:1554)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.pollTask(MinecraftServer.java:1547)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.util.thread.BlockableEventLoop.runAllTasks(BlockableEventLoop.java:117)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.waitUntilNextTick(MinecraftServer.java:1504)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1344)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:340)
[15:03:33] [Paper Watchdog Thread/ERROR]: net.minecraft.server.MinecraftServer$$Lambda/0x00007fc8dcd9e428.run(Unknown Source)
[15:03:33] [Paper Watchdog Thread/ERROR]: java.base@21.0.6/java.lang.Thread.runWith(Thread.java:1596)
[15:03:33] [Paper Watchdog Thread/ERROR]: java.base@21.0.6/java.lang.Thread.run(Thread.java:1583)
[15:03:33] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:03:33] [Paper Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH ---
[15:03:33] [Paper Watchdog Thread/ERROR]: ------------------------------
[15:03:38] [Paper Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PAPER - THIS IS NOT A BUG OR A CRASH - 1.21.3-67-d38624b (MC: 1.21.3) ---

[kireikosasha]

Watchdog? I don't think this is because my plugin, but pls give spark

[Lagggpixel]

Watchdog? I don't think this is because my plugin, but pls give spark

I'll try to give you a spark report, but I have 0 promises as this tends to happen on server startup (about 40 players joining).

[Lagggpixel]

Watchdog? I don't think this is because my plugin, but pls give spark

Is there anyway I can DM you the report if I do get it?

[kireikosasha]

Discord @pawsashatoy

[Lagggpixel]

Discord @pawsashatoy

Seems to be fine for now, I'll let you know when there are issues. (I'm going to close this for now).

[Lagggpixel]

Issue is still persistent after update as well. Only happens when MX is on the server. Packet causing issue seems to be: ServerboundFinishConfigurationPacket

[kireikosasha]

I'm really need more info
I'm not use Object.wait0(Native Method)
Spark pls 🙏🙏

[Dg32z]

Issue is still persistent after update as well. Only happens when MX is on the server. Packet causing issue seems to be: ServerboundFinishConfigurationPacket

You are wasting everyone's time. You should provide more information, such as spark

[Lagggpixel]

Reminder that spark reports don't generate until 180s after server start, making it hard to get you a spark seemingly as this is crashing in the first minute.

Further, this has nothing to do with waiting, but with how the packet is handled as clearly shown by the trace stack.

I am also looking through the source of MX and doing various tests myself at the time of writing this.

[Lagggpixel]

Issue is still persistent after update as well. Only happens when MX is on the server. Packet causing issue seems to be: ServerboundFinishConfigurationPacket

You are wasting everyone's time. You should provide more information, such as spark

I am aware of difficulties with this problem as this is difficult to replicate, which is why I've not demanded this to be solved but instead left this here as a note of: this may be an issue that happens.

[CAJIO]

Аналогичная проблема на Purpur 1.21
На 8ГБ выделенной памяти сервер работает несколько часов. На 13ГБ работает примерно 7 часов, а потом зависает.

[20:14:34] [Watchdog Thread/ERROR]: --- DO NOT REPORT THIS TO PURPUR - THIS IS NOT A BUG OR A CRASH - 1.21-2284-4e55e26 (MC: 1.21) ---
[20:14:34] [Watchdog Thread/ERROR]: The server has not responded for 60 seconds! Creating thread dump
[20:14:34] [Watchdog Thread/ERROR]: ------------------------------
[20:14:34] [Watchdog Thread/ERROR]: Server thread dump (Look for plugins here before reporting to Purpur!):
[20:14:34] [Watchdog Thread/ERROR]: Handling packet for connection: net.minecraft.server.network.ServerLoginPacketListenerImpl@66918c6f
[20:14:34] [Watchdog Thread/ERROR]: ------------------------------
[20:14:34] [Watchdog Thread/ERROR]: Current Thread: Server thread
[20:14:34] [Watchdog Thread/ERROR]: PID: 64 | Suspended: false | Native: false | State: WAITING
[20:14:34] [Watchdog Thread/ERROR]: Stack:

И перечисление всех активных потоков где нет полезной информации. Дамп spark записать не получается из за низкой предсказуемости данного зависания.

Могу предположить, что банально течет память. Использование CopyOnWriteArrayList расходует много ресурсов, а многие списки никогда не очищаются.