An interesting cause for server crashes.

Mathue24 · Jul 27th 2018

Hey, so few hours ago my server just shut down after a server crash, and ever since its been crashing every 10 or so minutes.

Here are the errors from the log:

Code

[13:39:10] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_13_R1.ReportedException: Exception ticking world
at net.minecraft.server.v1_13_R1.MinecraftServer.w(MinecraftServer.java:951) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.DedicatedServer.w(DedicatedServer.java:411) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.MinecraftServer.v(MinecraftServer.java:819) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.MinecraftServer.run(MinecraftServer.java:717) [minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
Caused by: java.lang.IllegalArgumentException: Unknown tree generator net.minecraft.server.v1_13_R1.WorldGenForestTree@1ab50673
at net.minecraft.server.v1_13_R1.WorldGenMegaTreeProvider.a(WorldGenMegaTreeProvider.java:38) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.WorldGenMegaTreeProvider.a(WorldGenMegaTreeProvider.java:15) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.BlockSapling.grow(BlockSapling.java:66) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.BlockSapling.a(BlockSapling.java:37) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.Block.b(Block.java:382) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.IBlockData.b(SourceFile:265) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.WorldServer.l(WorldServer.java:555) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.WorldServer.doTick(WorldServer.java:305) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.MinecraftServer.w(MinecraftServer.java:940) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
... 4 more

[13:39:10] [Server thread/ERROR]: Cause of unexpected exception was
java.lang.IllegalArgumentException: Unknown tree generator net.minecraft.server.v1_13_R1.WorldGenForestTree@1ab50673
at net.minecraft.server.v1_13_R1.WorldGenMegaTreeProvider.a(WorldGenMegaTreeProvider.java:38) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.WorldGenMegaTreeProvider.a(WorldGenMegaTreeProvider.java:15) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.BlockSapling.grow(BlockSapling.java:66) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.BlockSapling.a(BlockSapling.java:37) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.Block.b(Block.java:382) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.IBlockData.b(SourceFile:265) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.WorldServer.l(WorldServer.java:555) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.WorldServer.doTick(WorldServer.java:305) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.MinecraftServer.w(MinecraftServer.java:940) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.DedicatedServer.w(DedicatedServer.java:411) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.MinecraftServer.v(MinecraftServer.java:819) ~[minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at net.minecraft.server.v1_13_R1.MinecraftServer.run(MinecraftServer.java:717) [minecraft_server.jar:git-Spigot-f68f5a8-4b00823]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]

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Now I have deducted, and correct me if I am wrong, it seems like a sapling is causing the server to crash every time a tick passes and its supposed to grow.

Now my suspicion is that this might be because of an old plugin (that I removed now) that would replant trees after cutting(burning) the tree although I have noticed the sapling created was not the same type as the tree cut down.

Any clue on whats up and how I can solve this other than a rollback?

Roman · Jul 28th 2018

Could you please share the complete log with us using the share button on the log page.

Mathue24 · Jul 28th 2018

Here

https://mclo.gs/prKFfGg#L1

Another thing I found out, it doesn't crash without Spigot installed and running just pure vanilla on the same world.

I will try the elimination method to nail down the plugin causing it. (unless its spigot itself)

Mathue24 · Jul 28th 2018

UPDATE:

So after rigorous amounts of testing, I came to the conclusion that none of the plugins themselves cause this issue but Spigot itself. This is because the elimination method proved inconclusive after it keep crashing after no plugins being present.

Also another thing.

Every time it crashes the errors are the same. No matter what. As long as Spigot is installed it keeps crashing.

Gonna try Bukkit next.

Mathue24 · Jul 28th 2018

Same issue on Bukkit, starting to run out of options here....

Roman · Jul 28th 2018

So if this is a issue caused by bukkit/spigot there is not really a way to fix that on our side.

Mathue24 · Jul 28th 2018

I understand, I was just hoping some of you are good at reading minecraft crash-logs

An interesting cause for server crashes.

Roman Sep 15th 2020

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