On Tue, 17 May 2022 07:46:09 -0400
Sam Varshavchik <mrsam(a)courier-mta.com> wrote:
No, everything's frozen, no response. It usually hangs
overnight,
with the monitor sleeping. No response from the keyboard, no pings
from the network. The only thing to do is to hit reset and reboot.
Nothing gets logged in syslog. journalctl shows the normal noise,
then dead silence.
Maybe switch to a console before leaving it for the night. And run
something in the console to constantly monitor the system, like top, but
more informative. Then when it freezes, the last things running and
their issues are already on screen.
I vaguely recall having an issue with a screensaver having a memory
leak, and when the system was down for longer periods of time, it would
do a freeze like this. I don't recall the exact details. There was no
OOM killer then, and I'm not sure the OOM killer would take care of
that.
And I had something like this happen when a power supply was going
flaky. The voltages had drifted out of spec as it decayed.
SSH into the system to see if it responds?
Tough problem to diagnose.