Hi,
I have ten orange-pi pc plus with Ubuntu 20.04.2 LTS with Linux 5.10.43-sunxi burned onto emmc, and twenty orange-pi pc plus with Focal 21.05.6 with Linux 5.10.43-sunxi burned onto emmc.
In an attempt to provoke the same issues we have with Xenial on these boxes, I have all of them rebooting (shutdown -r now) once every 10 minutes. They have all been under test for several days.
They are all connected to a LAN backbone, but the LAN is not connected to the internet, so whilst they may be attempting to do unattended upgrades, for example, they are all failing. This is a deliberate part of the test.
Of the twenty Focal 21 boxes none have failed.
Of the ten Focal 20 boxes within 24 hours three have halted instead of rebooted, having been successfully rebooting for some time. I can find nothing in any of the logs (syslog, dmesg, kern, armbian, unattended-upgrades or auth) to indicate why they chose to halt. I know they halted because I have a screen plugged into the HDMI port and the last few lines are to do with halting and not rebooting (see attached screen shot - sorry about the quality), and the green led is off.
My questions are:
Has anyone seen this behaviour before whether on Focal 20 or otherwise? If so did you find out why?
Is it possible that the "shutdown -r now" command is occasionally being misinterpreted as "shutdown now"?
Is there anything else in the opsys that could be causing the halt?
many thanks
andy