The jls command causes kernel panic in certain cases.

Relative easy to trigger the bug, just try the following PoC:
$ sudo jail -n crashme -c ip4=new persist
$ jls

See more details in FreeBSD PR196474 or the commits commits:
https://github.com/HardenedBSD/hardenedBSD/commit/7cc6ffbda459280327491d...
https://github.com/HardenedBSD/hardenedBSD/commit/95554c7d65e071f9f8480c...