[SEVERE] java.util.ConcurrentModificationException

Error: http://pastebin.com/ySKSGs1G
This error has been popping up for about 3 weeks now. After it happens, the server still runs, but no one is able to get on. When trying to connect the user get the "End of stream" error.

From looking on the forum, I saw some say that a plug in causes this. Maybe someone can point out a problamatic one out of the ones I am using. Or maybe there is a way to see what causes the error? To be honest I don't even know exactly what the error means. It's getting really frustrating though having to check on the server very often to make sure it's ok when going about my day

General System information
What operating system are you running the server on?
Cent OS
Is it a 64 bit or 32 bit version of the OS?
64-bit
What version of Java are you running (java -version to find out)?
1.6.0_25
How much RAM do you have on the system?
12GB
What are the specs of the server’s CPU?
i7 2600
What network card does the server have?
Not sure
What network card drivers is the server using?
Not sure
What firewall or other security software is running on the server?
Not sure
Is your server directly connected to your router or on a network?
It's a hosted/dedicated server, so I assume they use some kind of router.
What is the network connection to your server? (1,5,10, 100 mbit .. etc?)
100Mbit
Are you hosting on a VPS / Cloud or dedicated hardware?
Dedicated Hardware

Minecraft Server Information
What version of CraftBukkit are you running (output of /version in-game - please provide the full version string)?
This server is running Craftbukkit version git-Bukkit-0.0.0-892-ga9ddbaa-b935jinks (MC: 1.6.6)
What plugins (and their versions) is your server running?
https://spreadsheets.google.com/spr...cU5Vbk5Qc1dHblhjM3c&hl=en_US&authkey=CNaQqIwK
How much RAM do you allocate to the server process?
7GB
What is the launch line you use to start the server?
java -server -Xmx7000M -Xms7000M -Djava.net.preferIPv4Stack=true -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSIncrementalPacing -XXarallelGCThreads=8 -XX:+AggressiveOpts -jar craftbukkit.jar nogui
Do you experience high CPU load or paging during the time of the EoS?
No
How many users are actively using your server when you experience the errors?
Irrevelant on how many users are on. Happens when we have 2, and when we have 30.
What are your users doing around the time the error occurs?
Seems to happen absolutely at random.
How large is your map?
Main world is 3500 block radius. (700MB)
Other maps are all 1000block radius.
Are there large redstone circuits or minecart tracks on your map?
No
Are you seeing any “Cannot keep up” errors around the time of the EoS? (Or just post ~10 lines from the log around the event?)
N0
Do you still have these problems if you run your CraftBukkit server without plugins?
Did not try, as the crashes happens at random.
Do you still have these problems if you run a Minecraft server without CraftBukkit?
Same as above.

 

It kinda looks like some sort of chunk-error. You could load a copy of your world into MCEDIT http://www.minecraftforum.net/topic/13807-mcedit-minecraft-world-editor-compatible-with-mc-beta-166/
It has an analyzer function to detect and fix corrupted chunks (or stucked mobs/minecarts etc)

 

Do you mean the repair option when you hold CTRL key? If so I did do that and it did not find any errors.

 

Yes, that's what I meant.. And it was just a guess..
A bad one, since I totally ignored this: java.util.ConcurrentModificationException .. Most likely one of your plugins. But besides removing them all and adding them one by one, I have no idea how you could find the problem.
Maybe you could try disabling all plugins which can change blocks..

 

Yeah there isn't much to do. I just thought someone maybe recognizes a plug in that is problematic and can cause this.

So after some research and searching through 151 server logs I've narrowed it down to bCoolDown as the culprit of this.

I've removed the plugins since and will report back tomorrow.


Edit: Yup, ever since removing bCoolDown, the server has not crashed.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.