Problem Still problems

[Sunny]

So recently the new problem with world leaking has happened on my server. My server is a Direwolf20 5.2.1 using mymcadmin hosted by redstonehost. so I tried to remove a mod to see if that would fix it. I'm not sure what the OS is other then its a centOS linux, the java runtime is 1.7.0 and the server has no added mods. That mod was chicken chunks. The server stopped leaking but now I get this problem. I put the mod back on but I still get this problem.
4:51:52 PM
CONSOLE:
[INFO] java.util.ConcurrentModificationException
4:51:52 PM
CONSOLE:
[INFO] at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
4:51:52 PM
CONSOLE:
[INFO] at java.util.HashMap$ValueIterator.next(Unknown Source)
4:51:52 PM
CONSOLE:
[INFO] at bq.a(SourceFile:24)
4:51:52 PM
CONSOLE:
[INFO] at cd.a(SourceFile:114)
4:51:52 PM
CONSOLE:
[INFO] at ca.a(CompressedStreamTools.java:140)
4:51:52 PM
CONSOLE:
[INFO] at aam.a(AnvilChunkLoader.java:198)
4:51:52 PM
CONSOLE:
[INFO] at aam.c(AnvilChunkLoader.java:184)
4:51:52 PM
CONSOLE:
[INFO] at aiw.b(SourceFile:29)
4:51:52 PM
CONSOLE:
[INFO] at aiw.run(SourceFile:22)
4:51:52 PM
CONSOLE:
[INFO] at java.lang.Thread.run(Unknown Source)

Here is the pastebin

http://pastebin.com/C0hiGvJK​

 

[Ashzification]

Can you put your entire log on pastebin.com and link the paste URL?