Hello
After upgrading the machine to 7.5 amd64 doveadm command used for
indexing mailboxes does not work anymore:

# doveadm -Dvv index -u somemailbox@somedom.com '*'
... some usual diagnostic messages...
May 31 06:33:12 doveadm(somemailbox@somedom.com): \
	Debug: Mailbox INBOX: UID 1048: Opened mail because: fts indexing
Segmentation fault

There is also an entry in dovecot.log when mail indexing was to be done
automatically:
May 31 01:30:07 mail dovecot: indexer-worker(somemailbox@somedom.com)\
	<18492><PxI5Eu/9WGZ8QAEASKskHw:uKsgIO/9WGY8SAAASKskHw>:\
	Fatal: master: service(indexer-worker): child 18492 killed \
	with signal 11 (core not dumped -\
	https://dovecot.org/bugreport.html#coredumps - set service \
	indexer-worker { drop_priv_before_exec=yes })

# pkg_info -m | grep dovecot
dovecot-2.3.21v0    compact IMAP/POP3 server
dovecot-fts-xapian-1.7.0 full text search plugin for Dovecot using Xapian
dovecot-ldap-2.3.21v0 LDAP authentication / dictionary support for Dovecot
dovecot-pigeonhole-0.5.21v1 Sieve mail filtering for Dovecot

Last configuration changes in dovecot were made long before upgrade and
I did not have problems with that configuration on 7.4


-- 
Best regards
Maksim Rodin