Answered: ocsinventory-agent command reboot the server.

Sorry, I can't test it on other server, because I don't want to be in the same situation.
And with a test system I can't create the same situation.

The locally command kill the server as well. No entries in the /var/log/messages just the booting method after the reboot.
The last message block in the ocsinventory-agent.log:
[Fri Mar  3 08:28:45 2017][debug]  - Sys::Hostname loaded
[Fri Mar  3 08:28:45 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Lspci
[Fri Mar  3 08:28:45 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Lspci::Controllers
[Fri Mar  3 08:28:46 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Lspci::Modems
[Fri Mar  3 08:28:46 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Lspci::Sounds
[Fri Mar  3 08:28:46 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Lsusb
[Fri Mar  3 08:28:46 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Lsusb::Usb
[Fri Mar  3 08:28:46 2017][debug] Running Ocsinventory::Agent::Backend::OS::Generic::Screen