Frequent Server Crash ConcurrentModificationException

Hey all,

just updated from the last promoted build to #493, and while all seemed great at first, I am now getting frequent crashes with the following error:

Code:

00:08:20 [SEVERE] java.util.ConcurrentModificationException
00:08:20 [SEVERE]       at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
00:08:20 [SEVERE]       at java.util.AbstractList$Itr.next(AbstractList.java:343)
00:08:20 [SEVERE]       at java.util.AbstractCollection.removeAll(AbstractCollection.java:336)
00:08:20 [SEVERE]       at net.minecraft.server.Chunk.e(Chunk.java:475)
00:08:20 [SEVERE]       at net.minecraft.server.ChunkProviderServer.a(ChunkProviderServer.java:220)
00:08:20 [SEVERE]       at net.minecraft.server.World.g(World.java:1416)
00:08:20 [SEVERE]       at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:348)
00:08:20 [SEVERE]       at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:272)
00:08:20 [SEVERE]       at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)
00:08:20 [SEVERE] Unexpected exception
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at java.util.AbstractCollection.removeAll(AbstractCollection.java:336)
        at net.minecraft.server.Chunk.e(Chunk.java:475)
        at net.minecraft.server.ChunkProviderServer.a(ChunkProviderServer.java:220)
        at net.minecraft.server.World.g(World.java:1416)
        at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:348)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:272)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:366)

I'm currently working my way through removing different plugins to try and find a cause, but it's unsuccesful so far.

Server Information:

Code:

Linux Ultimate-Minecraft 2.6.35-27-server #48-Ubuntu SMP Tue Feb 22 21:53:16 UTC 2011 x86_64 GNU/Linux

Plugins:
[CODE][INFO] Plugins: LightVote, AntiBuild, Runecraft, PluginControl, Help, EssentialsUpdate, MagicCarpet, CommandHelper, MyWarp, Essentials, iConomy, LWC, Permissions, PrivateWarp, M
CBans, FenceStack, TelePlus, WorldGuard, LogBlock, CraftBookCircuits, Cleaner, CraftBookMechanisms, MyHome, WorldEdit, Vanish, CraftIRC, CraftBookCommon, EssentialsSpawn, CraftBookVehicles, GroupManager, HeroChat

EDIT: Just found this topic <--- Exact same problem as I am having, but old CB build. I also suffered from the "Connection Reset" hang. Will check plugins...

 

Are you by any chance running the remote toolkit wrapper?

 

Nope, never even heard of it.

Identified the problem as being official runecraft - removed it and all is well. I never did like runecraft.