On 6. Aug 2021, at 15.08, Joan Moreau <jom@grosjo.net> wrote:

Below

(gdb) bt full
#0 fts_user_autoindex_exclude (box=<optimized out>, box@entry=0x55e0bc7e0fe8) at fts-user.c:347


There is no such function in 2.3.16 release. That's only in the current git master. What did you install and from where?