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Date:      Fri, 12 Jan 2024 17:52:55 -0800
From:      bob prohaska <fbsd@www.zefox.net>
To:        Mark Millard <marklmi@yahoo.com>
Cc:        FreeBSD ARM List <freebsd-arm@freebsd.org>
Subject:   Re: USB-serial adapter suggestions needed
Message-ID:  <ZaHs99yGcoEBXxl%2B@www.zefox.net>
In-Reply-To: <9F0BEC32-93CB-4DEB-98C4-D0FF2284B9DE@yahoo.com>
References:  <902798B1-2B66-4ECD-BDAC-195C85066FE6@yahoo.com> <8B4C76B2-707E-4978-9CB3-5D547303A7E5@yahoo.com> <ZaFoY58MqBv9hX5b@www.zefox.net> <A1F3092A-CEB1-44DE-ADB3-F45113004B34@yahoo.com> <ZaGQfy8u2xYzztri@www.zefox.net> <482FA770-89E8-42E8-945E-B662AD564AFE@yahoo.com> <ZaGxMA23qXBSC4Jj@www.zefox.net> <B3EF009B-F7FE-4D2D-A266-D064C82E0DFF@yahoo.com> <EE0BA069-9E14-45ED-BEC9-618D1F4C1DB8@yahoo.com> <9F0BEC32-93CB-4DEB-98C4-D0FF2284B9DE@yahoo.com>

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On Fri, Jan 12, 2024 at 05:18:25PM -0800, Mark Millard wrote:
> Do you have the following sort of thing in each /etc/sysctl.conf ?
> 
> #
> # Together this pair avoids swapping out the process kernel stacks.
> # This avoids processes for interacting with the system from being
> # hung-up by such swapping out of process kernel stacks (and other
> # types of processes as well).
> vm.swap_enabled=0
> vm.swap_idle_enabled=0

Not on pelorus.zefox.org, www.zefox.com, nemesis.zefox.com, fixed now.
The rest already had the setting.

While checking, I logged in as root on the serial consoles of each host.
When I tried to log in to www.zefox.net the response was


FreeBSD/arm (www.zefox.net) (ttyu0)

login: root
Password:
Corrupted MAC on input.
ssh_dispatch_run_fatal:

I've seen this only once before, I think logging in to pelorus.zefox.org.
Re-running ssh to the terminal server and tip to www.zefox.net 
connected directly to a running console root shell. Apparently the
login attempt started a root session on the console and detached
the tip connection. For some reason I find that rather sinister.

Am I being unreasonable?

Thanks for writing!

bob prohaska




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