I have done a search of the debian-user archive, using the same text as the subject, and found several references to emails with similar problems. However, no exact solution was proposed.
And this actually only happens on one of the two systems I have Debian installed on. I'm using testing (stretch). When I shutdown my desktop system, the screen displays messages from systemd (I presume), the last of which is "Reached target Shutdown". It then just sits there. I have taken to using a power strip with a switch as a way to quickly turn the host off, once it has reached the target. On my laptop, I see the same message, followed by powering off the system. Tonight, I happened to take longer than usual to get to my desktop system, and while writing down the exact wording of the message, the kernel panicked. My laptop is around ten years old, an HP Pavilion dv9000, the desktop is about half that age, a home built "gamer" level hardware system. Any ideas what I should be looking for? The fact the kernel panics on my desktop would imply to me there is a kernel configuration issue of some sort, but I have no idea where to start. Thanks, Bob