On 11/2/25 20:24, Stuart Longland VK4MSL wrote:
Hi all,
I have a PC Engines APU3 running OpenBSD 7.6 which seems to have had a
process run away, to the point that `sshd` is not accepting connections
and serial console accepts a username at the `login:` prompt then hangs.
Obviously with the machine in this condition, it is not possible to
provide a `dmesg` because I can't log in right now to issue that command.
On Linux, it's possible to trigger a remote reboot using BREAK-b.
Is this possible on OpenBSD?
Seems this is done via `ddb`; with `BREAK` triggering `ddb` and a
`reboot` command doing what I'm after.
https://man.openbsd.org/ddb
It may be invoked from the console when the sysctl ddb.console is set to 1,
using any of the following methods:
Using the key sequence Ctrl-Alt-Esc.
Sending a BREAK when using a serial console.
Writing to the sysctl ddb.trigger.
For i386 and amd64 architectures, using the key sequence Ctrl-Alt-Delete
when the sysctl machdep.kbdreset is set to 2.
I'm guessing it's not working because `ddb.console` is not set to 1 by
default (likely for security reasons).
Might see if I can get someone on site to yank the power for a few seconds.
--
Stuart Longland (aka Redhatter, VK4MSL)
I haven't lost my mind...
...it's backed up on a tape somewhere.
