I don't see anything wrong in git branch either:
% git clone -b release-2.3.16 https://github.com/dovecot/core.git <https://github.com/dovecot/core.git> % git grep fts_user_autoindex_exclude %
% git show commit 7e2e900c1a420006371e8a8cf9b4ddb36e69a986 Author: Timo Sirainen <timo.sirainen@open-xchange.com> Date: Thu Aug 5 18:25:31 2021 +0300
NEWS: Add 100% master process CPU item
I think somehow you built it from master instead of release-2.3.16.
On 6. Aug 2021, at 16.28, Joan Moreau <jom@grosjo.net> wrote:
git clone -b release-2.3.16
On 2021-08-06 15:07, Timo Sirainen wrote:
On 6. Aug 2021, at 15.08, Joan Moreau <jom@grosjo.net <mailto: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?