Gitlab High CPU usage (even when gitlab service is not running)

So we are currently running Gitlab-CE 10.3.0 on an Ubuntu server - and I’m having weird problem with gitlab somehow permanently maxing out the CPU usage. Using top command there is always a gitlab process running at ~400% CPU.

Whats even more strange is that the process is still active when i shut down the gitlab service. Process is owned by the gitlab-www user and command says DplN - anyone knows what that could be?