How do i Fix CPU 100% Kthreaddk in may linode ubuntu + Tomcat?

Kthreaddk is using 98.7 and 98.3% of the CPU. I Kill the process and seconds later appears the same process with the same problem.

I used the backups but 2 days later appear the same issue.

I Have a linode with Tomcat and Java 8. The firewall allow only the 8080 port.

Any suggest?

Sorry for my english.