I rebuilt practically everything. These errors are happening with both 2.3.1 and 2.3.2. They are from dovecot-lmtp-errors.log:
Also I get some of these in /var/log/messages which is even worse I guess:
OS: FreeBSD
Panic: file lib-event.c: line 182 (event_pop_global): assertion failed: (event != NULL)
Also I get some of these in /var/log/messages which is even worse I guess:
dovecot[40214]: lmtp: Fatal: master: service(lmtp): child 52296 killed with signal 6 (core not dumped - https://dovecot.org/bugreport.html#coredumps - set service lmtp { drop_priv_before_exec=yes })
OS: FreeBSD