Omg, it's an inside-joke at our company now.

Anytime something happens on a server that's been running great for years, like a hard drive going bad or the time one literally caught on fire...

98% of the time it is selinux that is the reason it is doing weird things after the main fix because selinux changed a setting on the reboot.

"Have you checked selinux?" is the go to question whenever anything breaks now, even if it's not a computer.