>                        How to make a kernel panic
>
> The problem will be No defined variable IPTABLES-SSH after 'guix system
> reconfigure' and kernel crash after.

[...]

> Make a kernel panic
>
>     sudo GUILE_LOAD_PATH=\"$HOME/src/iptables\
>     :$GUILE_LOAD_PATH\" guix system reconfigure \
>     $HOME/dotfiles/guix/system-magnolia.scm
>
>     # Run above again and kernel will panic.

I tried to reproduce it with my user’s shepherd, but that didn’t work:

--8<---------------cut here---------------start------------->8---
ludo@ribbon ~/src/guix$ cat ,t.scm
(define s
  (make <service>
    #:provides '(nothing)
    #:start (lambda _ unbound)))

(register-services s)
(start s)
ludo@ribbon ~/src/guix$ herd load root ,t.scm
Loading ,t.scm.
herd: exception caught while executing 'load' on service 'root':
ERROR: Unbound variable: foo
ludo@ribbon ~/src/guix$ herd load root ,t.scm
Loading ,t.scm.
herd: exception caught while executing 'start' on service 'nothing':
ERROR: Unbound variable: unbound
ludo@ribbon ~/src/guix$ herd load root ,t.scm
Loading ,t.scm.
Assertion (null? (lookup-services (canonical-name new))) failed.
herd: exception caught while executing 'load' on service 'root':
ERROR: Throw to key `assertion-failed' with args `()'.
ludo@ribbon ~/src/guix$ echo $?
1
ludo@ribbon ~/src/guix$ herd status

[...]

ludo@ribbon ~/src/guix$ echo $?
0
--8<---------------cut here---------------end--------------->8---

IOW, shepherd caught the exceptions and didn’t die.

What am I missing?

Ludo’.