getty ttyS0 message pollutes logs

[ZubairLK]

For this device

root@462a4e8:~# cat /etc/os-release
ID="resin-os"
NAME="Resin OS"
VERSION="2.13.6+rev1"
VERSION_ID="2.13.6"
PRETTY_NAME="Resin OS 2.13.6+rev1"
RESIN_BOARD_REV="c561fa5"
META_RESIN_REV="e167839"
SLUG="intel-nuc"
MACHINE="genericx86-64"
VARIANT="Development"
VARIANT_ID="dev"

The log is full of these error messages

root@462a4e8:~# journalctl -f -a
-- Logs begin at Tue 2018-08-07 06:29:29 UTC. --
Aug 07 11:27:35 462a4e8 systemd[1]: Started Serial Getty on ttyS0.
Aug 07 11:27:35 462a4e8 agetty[14865]: /dev/ttyS0: not a tty
Aug 07 11:27:45 462a4e8 systemd[1]: serial-getty@ttyS0.service: Service has no hold-off time, scheduling restart.
Aug 07 11:27:45 462a4e8 systemd[1]: Stopped Serial Getty on ttyS0.
Aug 07 11:27:45 462a4e8 systemd[1]: Started Serial Getty on ttyS0.
Aug 07 11:27:45 462a4e8 agetty[14903]: /dev/ttyS0: not a tty
Aug 07 11:27:55 462a4e8 systemd[1]: serial-getty@ttyS0.service: Service has no hold-off time, scheduling restart.
Aug 07 11:27:55 462a4e8 systemd[1]: Stopped Serial Getty on ttyS0.
Aug 07 11:27:55 462a4e8 systemd[1]: Started Serial Getty on ttyS0.
Aug 07 11:27:55 462a4e8 agetty[14904]: /dev/ttyS0: not a tty
Aug 07 11:28:05 462a4e8 systemd[1]: serial-getty@ttyS0.service: Service has no hold-off time, scheduling restart.
Aug 07 11:28:05 462a4e8 systemd[1]: Stopped Serial Getty on ttyS0.
Aug 07 11:28:05 462a4e8 systemd[1]: Started Serial Getty on ttyS0.
Aug 07 11:28:05 462a4e8 agetty[14907]: /dev/ttyS0: not a tty
Aug 07 11:28:15 462a4e8 systemd[1]: serial-getty@ttyS0.service: Service has no hold-off time, scheduling restart.
Aug 07 11:28:15 462a4e8 systemd[1]: Stopped Serial Getty on ttyS0.
Aug 07 11:28:15 462a4e8 systemd[1]: Started Serial Getty on ttyS0.
Aug 07 11:28:15 462a4e8 agetty[14943]: /dev/ttyS0: not a tty
Aug 07 11:28:25 462a4e8 systemd[1]: serial-getty@ttyS0.service: Service has no hold-off time, scheduling restart.
Aug 07 11:28:25 462a4e8 systemd[1]: Stopped Serial Getty on ttyS0.
Aug 07 11:28:25 462a4e8 systemd[1]: Started Serial Getty on ttyS0.
Aug 07 11:28:25 462a4e8 agetty[14945]: /dev/ttyS0: not a tty

[ZubairLK]

This happens on my VM. And I had no serial port configured. i.e. ttyS0 didn't exist.
So the getty process would die silently causing this.

Attaching a com port in VM made these go away. I guess this is more a configuration issue rather than an OS issue. While there might be a graceful way of handling this. I'll close this issue here.