[Borgbackup] Repo init failure on a NFS directory with a raspberry pi 4

[Bzzzz]

Hi borgbackupeters,

I installed 1.1.13 with pip3 without any problem, however the repo init
on a NFS share is systematically failing (I'm doing that on several x86
machines without any problem - NFS mount options are the same).

Here is the output of the init command :

$ sudo borg init -e keyfile /BORG/
Enter new passphrase:
Enter same passphrase again:
Do you want your passphrase to be displayed for verification? [yN]:
Fatal Python error: Bus error

Current thread 0xf79df8e0 (most recent call first):
  File
"/usr/local/lib/python3.7/dist-packages/borg/crypto/file_integrity.py",
line 75 in write
  File
"/usr/local/lib/python3.7/dist-packages/borg/crypto/file_integrity.py",
line 29 in write
  File
"/usr/local/lib/python3.7/dist-packages/borg/algorithms/msgpack/__init__.py",
line 38 in pack
  File
"/usr/local/lib/python3.7/dist-packages/borg/repository.py", line 613 in
write_index
  File
"/usr/local/lib/python3.7/dist-packages/borg/repository.py", line 476 in
commit File "/usr/local/lib/python3.7/dist-packages/borg/archiver.py",
line 297 in do_init
  File
"/usr/local/lib/python3.7/dist-packages/borg/archiver.py", line 176 in
wrapper File "/usr/local/lib/python3.7/dist-packages/borg/archiver.py",
line 4497 in run
  File
"/usr/local/lib/python3.7/dist-packages/borg/archiver.py", line 4565 in
main File "/usr/local/bin/borg", line 10 in <module>
Erreur du bus


It also fails with repokey.

Could somebody explain me why is that and what to do to make it work?