[#SPIGOT-6648] Server crashes after tens of teleports

[SPIGOT-6648] Server crashes after tens of teleports Created: 14/Jul/21 Updated: 16/Jul/21 Resolved: 14/Jul/21
Status:	Resolved
Project:	Spigot
Component/s:	None
Affects Version/s:	None
Fix Version/s:	None

Type:

Bug

Priority:

Major

Reporter:

Eli

Assignee:

Unassigned

Resolution:

Invalid

Votes:

Labels:

None

Environment:

https://www.ovhcloud.com/en/bare-metal/rise/rise-2/

This specfic Minecraft server runs 7GB RAM

Version:

3180-Spigot-38e6c03-ca0fe5b (MC: 1.17.1)

Plugin:

my own, 'me.justeli.common.api.teleport.TeleportExecutor.teleport(TeleportExecutor.java:146)' is nothing more than Player#teleport(Location)

Guidelines Read:

Yes

Description

This has been occuring eversince I updated to 1.17.1 from 1.17. Every time after about 20-50 teleports the server randomly freezes and crashes. The server freezes directly before someone is teleported (i.e. by doing /home). The server usually has an uptime of about an hour or two. It never occurs for teleporting to the same locations, it is a different location with every crash (also locations that didn't make the server crash before). Here's the crash in console: https://pastebin.com/wPHhMe9v

I've tried many things: remove plugins that were recently updated (not running many anyways), reset bukkit.yml and spigot.yml to default, change Player#teleport(Location) to PaperLib's async teleport (I write my own plugins for this server), remove startup flags that the server had, and more spigot-unrelated.

In the report you'll see `me.justeli.common.api.teleport.TeleportExecutor.teleport(TeleportExecutor.java:146)` simply teleports a player: `player.teleport(location)`. In this specific report there's also PaperLib, because I was trying that out as an attempt fix the issue. The crashes also occur without PaperLib.

The server has crashed ~60 times in the past 4 days. It also freezes when chunks are saving after the server is shut down by the crash.

Comments

Comment by Marvin Rieple [ 16/Jul/21 ]

After some testing, I would say this is more a problem with your hardware than with spigot. Your server hardware is not fast enough to generated / store the chunks.

Looking at the hardware you linked, you are using a HDD it can be that this one is not fast enough and you might want to upgrade to a SSD.

For my testing I constantly teleport two players to a random location every 5 seconds. When I run the server over my old HDD the first few teleports are ok, (under 1 second teleport time) but the provided RAM keeps growing as sone as the RAM hits nearly 100%. My HDD usage become 100% and the time it takes to teleport increased to around 14 seconds. My server didn't crash because the watchdog time out is 60 seconds.

When switching over to my SSD I had no problem at all and the teleport time was under 1 seconds even after hundreds of teleports. This is why I suspect that is a drive speed issue, which cannot keep up with storing / reading the chunks.

I would recommend monitoring the drive and CPU utilisation and see if they are at their limit and if so you may want to upgrade or try to pre-generated your world if you didn't already do this. If you need more help I would recommend opening a post on the forum https://www.spigotmc.org/forums/ and provide more infos such as your timeout-time in the spigot.yml, CPU and drive utilisation, player count, if the map is pre-generated or not, etc.

Code used for testing:

int teleport = 0;

@EventHandler
public void onPlayerJoin(PlayerJoinEvent event) {
    getLogger().info("Player " + event.getPlayer().getName() + " joined, starting teleporting");
    Bukkit.getScheduler().runTaskTimer(this, () -> {
        int x = ThreadLocalRandom.current().nextInt(-50000 ,50000);
        int y = 100;
        int z = ThreadLocalRandom.current().nextInt(-50000 ,50000);
        getLogger().info("[" + event.getPlayer().getName() + "] teleport #" + teleport + " Coordinates x: " + x + " z:" + z);
        event.getPlayer().teleport(new Location(event.getPlayer().getWorld(), x, y, z));
        getLogger().info("[" + event.getPlayer().getName() + "] teleport #" + teleport + " Done!");
        teleport++;
    }, 20, 20 * 5);
}

Comment by Eli [ 16/Jul/21 ]

Oh I'm sorry, I copied over the wrong crash report, from the first time it happened back when it ran Paper. Downgraded to Spigot right after that and ran it for 3 days. Here's the crash report I was supposed to post: https://pastebin.com/wPHhMe9v

Updated the crash report in the issue as well.

Comment by md_5 [ 14/Jul/21 ]

Not running spigot

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[SPIGOT-6648] Server crashes after tens of teleports Created: 14/Jul/21 Updated: 16/Jul/21 Resolved: 14/Jul/21