Bug#974730: systemd 247~rc2-2 install crashed several system

[Michael Biebl]

On Sat, 14 Nov 2020 11:56:25 +0100 Eric Valette <eric.valette at free.fr>
wrote:
> Package: systemd
> Version: 247~rc2-2
> Severity: critical
> Justification: breaks the whole system
> 
> I have updated several machine with experimental version and they did
break for
> various reasosn during install:
> 
>       1) One is a NAS that I was updating via ssh. during update, the
ssh session closed,
>       it was impossible to open a new one, and as the machine is
headless, very difficult to
>       know what happened. The power button did an acpi shutdwon and
the machine
>       did restart, but trying to do apt-get -f install, I have been
prompted to do a
>       dpkg --configure -a because update was interrupted.  After that
the machine was
>       operationnal again
>       2) One was a laptop, running a very recent kernel 5.9.8, This
time i did update
>       logged on a X11 kde konsole. During update, the entire X
session crashed, virtual
>       terminal were unreachable, remote login was impossible. Doing a
CTRL-ALT-DEL,
>       somehow did shutdown the machine but rebooting was impossible.
I had to select
>       an old kernel with its own initramfs, and to downgrade systemd
to the one from
>       unstable to get things back on order.

Are you configuring your NAS with ifupdown (using allow-hotplug).

Fwiw, that sounds very much like 
https://github.com/systemd/systemd/issues/17605#issuecomment-727187837
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