Kernel panic - not syncing: Watchdog detected hard LOCKUP on cpu x

Hello

I have 5 HP-DL360e-Gen8 Server running with RHEL 6.5 (command line) and two of them had today this crash.
Server was starting itself automaticaly. Both were with a uptime 6 days and few hours.
I am a newbie with RHEL...I was looking for that Error,but without success.
In one article I read that this kernel panic should be solved on the actual kernel. Strange.
As attachment you can find the kdump.log , the other logs are not really clear for me.
I hope somebody could help me to solve it. I can provide with logs.

Thanks in advance.