Problem server crashing intermittant

[Tradari]

Hi all I've been running a FTB and other Minecraft servers for sometime with no issues however I've recently built a Direwolf20 pack server and although its running it does from time to time crash I'm hoping somebody here might be able to help me as Im not able to see the problem

was running 1.012 recommended version but recent updated to 1.014 in an effort to fix the issue

the server is running linux ubuntu with 6gig ram on a quad cord cpu

attached are the error logs

 

[Tradari]

ok well a little update as its been bugging the hell out of me, I'm running my server on a platform Mcmyadmin. also I've just moved the whole FTB server over to my personal machine and used the windows command to run it. now here's the crux, everything so far seems ok so looks like a problem with java on the Linux machine I'm giving it another 24 hours before I decide that's its all ok of course. ill reformat the Linux machine and start again with it and see if this fixes the errors

 

[0n1yCB]

The problem you have is a ticking entity, a Zombie to be specific. Upon crash and restart the zombie despawns, so the server does't crash again. And then from time to time a new one spawns and crashes your server.

It is possible that this mob walked into a corrupted chunk. This specific chunk is located at 769.50, 21.00, -631.50

 

[Tradari]

thanks i thought about that but but im thinking its more a garbage collection issue i moved the server from the Virtual server and hosted it as is locally on my machine here at home and it ran as smooth for over 24 hours so placed it back on the server and 1 hour in bang crash. so i have the server config set to use 6 gig of ram so dropped it to 4 gig and it seems to run for longer. The next step is to try some GC lines and see if they help. im also using mcmyadmin as a hosting platform so i can monitor ram and cpu usage.

 

[Pantong]

guessing your using the launcher it came with?
I had this problem moving my server from home to data center. We eventually use a dev build of the launcher, adding in jvm's, setting priority to high, and the problem was gone.

Our problem exactly was the space for the objects and variables was getting filled too quickly and causing a crash. JVM's helped.

Also try with a new map and see if it crashes, it does look like the zombie ticking in a corrupted chunk.

 

[Tradari]

i found the fix! i have the server allocated 6 gig of ram on the virtual machine. so if i allocate 6 gig it crashes

below is the line i am using and everything seems great

-Xms3072m -Xmx3072m -XXermSize=256m -XX:NewRatio=3 -XX:SurvivorRatio=3 -XX:TargetSurvivorRatio=80 -XX:MaxTenuringThreshold=8 -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:MaxGCPauseMillis=10 -XX:GCPauseIntervalMillis=50 -XX:MaxGCMinorPauseMillis=7 -XX:+ExplicitGCInvokesConcurrent -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=60 -XX:+BindGCTaskThreadsToCPUs -Xnoclassgc

using this in the java option of the mcmyadmin.conf file

i found this fix by basically googling all over the place and found it so gave it a shot and bingo
one happy bunny
Tradari