What killed my process and why?

Question

My application runs as a background process on Linux. It is currently started at the command line in a Terminal window.

Recently a user was executing the application

Answer 1

The user has the ability to kill his own programs, using kill or Control+C, but I get the impression that's not what happened, and that the user complained to you.

root has the ability to kill programs of course, but if someone has root on your machine and is killing stuff you have bigger problems.

If you are not the sysadmin, the sysadmin may have set up quotas on CPU, RAM, ort disk usage and auto-kills processes that exceed them.

Other than those guesses, I'm not sure without more info about the program.