Hello Ludovic,

sorry for being slow to respond.

It seems that I fixed the error.

--8<---------------cut here---------------start------------->8---
$ cd guix
$ guix shell -D guix
$ ./pre-inst-env guix package --no-offload -f ../../projects/guile-ssh/guix.scm
$ ./pre-inst-env guix offload test
[...]
guix offload: successfully imported '/gnu/store/bf73m6ns9d2v6m4173y0ls5jz9fcxfhv-import-test' [...]
--8<---------------cut here---------------end--------------->8---

Please check this branch:
  https://github.com/artyom-poptsov/guile-ssh/tree/fix-segfault-on-remote-close

and let me know if it works for you.

Thanks,

- Artyom

-- 
Artyom "avp" Poptsov <poptsov.artyom@gmail.com>
Home page: https://memory-heap.org/~avp/
CADR Hackerspace co-founder: https://cadrspace.ru/
GPG: D0C2 EAC1 3310 822D 98DE  B57C E9C5 A2D9 0898 A02F