I'm the dovecot maintainer for FreeBSD. To get DEBUG symbols, if you are building your own package, add:

WITH_DEBUG_PORTS=mail/dovecot

To your /etc/make.conf, and the symbols should then be available.

-- Larry Rosenman http://www.lerctr.org/~ler Phone: +1 214-642-9640 E-Mail: larryrtx@gmail.com US Mail: 5708 Sabbia Drive, Round Rock, TX 78665-2106

On 11/22/18, 5:42 AM, "dovecot on behalf of Stephan Bosch" wrote:

Op 22-11-2018 om 3:47 schreef Bert JW Regeer:
> It happened again:

> I really wish I could get some better backtrace information, but unfortunately this is it :-(

Did you install the debug symbols for Dovecot? On Debian, those are 
available as a separate dovecot-dbg package. I'm not sure how FreeBSD 
provides this.

Regards,

Stephan.

>
>> On Nov 15, 2018, at 17:17, Bert JW Regeer <xistence@0x58.com> wrote:
>>
>> Hey all,
>>
>> I keep finding core dumps of the IMAP process on my FreeBSD 11.2, however the backtrace is not very useful:
>>
>> Core was generated by `imap: [xistence@0x58.com 2601:282:4301:befc:1cfb:807f:e527:5a3b UID SEARCH]'.
>> Program terminated with signal 6, Aborted.
>> #0  0x0000000011c0c47a in ?? ()
>> (gdb) bt
>> #0  0x0000000011c0c47a in ?? ()
>> #1  0x0000000011c0c444 in ?? ()
>> #2  0x00000000000188b0 in cmd_store ()
>> #3  0x0000000011c0c3b9 in ?? ()
>> #4  0x0000000012216810 in ?? ()
>> #5  0x0000000000000005 in ?? ()
>> #6  0xffffffdf00000000 in ?? ()
>> #7  0xffffffffffffffff in ?? ()
>> #8  0x00007fffffffffff in ?? ()
>> #9  0x0000000000000005 in ?? ()
>> #10 0x00007fffffffe240 in ?? ()
>> #11 0x000000001189c6f6 in ?? ()
>> #12 0x0000000012355e28 in ?? ()
>> #13 0x00000000122de048 in ?? ()
>> #14 0x0000000000000000 in ?? ()
>> (gdb)
>>
>> I am sorry that I haven't been able to find any more information or figure out what is going on :-(
>>
>> doveconf -n output follows:
>>
>> doveconf -n
>> # 2.3.2.1 (0719df592): /usr/local/etc/dovecot/dovecot.conf
>> # Pigeonhole version 0.5.2 (7704de5e)
>> # OS: FreeBSD 11.2-RELEASE-p4 amd64
>> # Hostname: juxi.0x58.com
>> auth_mechanisms = plain login
>> first_valid_gid = 127
>> first_valid_uid = 127
>> hostname = butler.0x58.com
>> last_valid_gid = 127
>> last_valid_uid = 127
>> lmtp_save_to_detail_mailbox = yes
>> login_greeting = Assume the position.
>> mail_gid = 127
>> mail_home = /usr/local/vmail/domains/%d/%n
>> mail_location = maildir:~/Maildir/
>> mail_plugins = " quota trash zlib virtual "
>> mail_uid = 127
>> managesieve_notify_capability = mailto
>> managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave duplicate
>> namespace butler {
>>   hidden = no
>>   list = yes
>>   location = virtual:/usr/local/vmail/virtual:LAYOUT=maildir++:INDEX=~/virtual
>>   mailbox All {
>>     auto = subscribe
>>     special_use = \All
>>   }
>>   mailbox Flagged {
>>     auto = subscribe
>>     special_use = \Flagged
>>   }
>>   prefix = [Butler]/
>>   separator = /
>>   subscriptions = yes
>>   type = private
>> }
>> namespace inbox {
>>   inbox = yes
>>   location =
>>   mailbox Drafts {
>>     special_use = \Drafts
>>   }
>>   mailbox Junk {
>>     auto = subscribe
>>     special_use = \Junk
>>   }
>>   mailbox Sent {
>>     special_use = \Sent
>>   }
>>   mailbox "Sent Messages" {
>>     special_use = \Sent
>>   }
>>   mailbox Trash {
>>     special_use = \Trash
>>   }
>>   prefix =
>>   separator = /
>>   subscriptions = yes
>> }
>> passdb {
>>   args = scheme=CRYPT username_format=%u /usr/local/vmail/domains/%d/passwd
>>   driver = passwd-file
>> }
>> plugin {
>>   fts = squat
>>   quota = maildir:User quota
>>   quota_rule = *:storage=5G
>>   quota_rule2 = Trash:storage=+100M
>>   quota_rule3 = Deleted Messages:storage=+100M
>>   recipient_delimiter = +
>>   sieve = ~/.dovecot.sieve
>>   sieve_dir = ~/sieve
>>   stats_refresh = 30 secs
>> }
>> postmaster_address = postmaster@butler.0x58.com
>> protocols = imap lmtp sieve
>> service auth {
>>   unix_listener /var/spool/postfix/private/auth {
>>     group = postfix
>>     mode = 0666
>>     user = postfix
>>   }
>>   unix_listener auth-userdb {
>>     group = vmail
>>     mode = 0666
>>     user = vmail
>>   }
>> }
>> service imap {
>>   drop_priv_before_exec = yes
>> }
>> service lmtp {
>>   unix_listener /var/spool/postfix/private/dovecot-lmtp {
>>     group = postfix
>>     mode = 0666
>>     user = postfix
>>   }
>> }
>> service managesieve-login {
>>   inet_listener sieve {
>>     port = 4190
>>   }
>> }
>> service stats {
>>   fifo_listener stats-mail {
>>     mode = 0600
>>     user = vmail
>>   }
>> }
>> ssl_cert = </usr/home/letsencrypt/letsencrypt.sh/certs/butler.0x58.com/fullchain.pem
>> ssl_cipher_list = HIGH:!SSLv2:!RC4:!3DES:!aNULL:@STRENGTH
>> ssl_dh =  # hidden, use -P to show it
>> ssl_key =  # hidden, use -P to show it
>> ssl_prefer_server_ciphers = yes
>> userdb {
>>   args = username_format=%u /usr/local/vmail/domains/%d/passwd
>>   default_fields = quota_rule=*:storage=3G
>>   driver = passwd-file
>> }
>> verbose_proctitle = yes
>> verbose_ssl = yes
>> protocol lmtp {
>>   mail_plugins = " quota trash zlib virtual sieve"
>> }
>> protocol lda {
>>   mail_plugins = " quota trash zlib virtual sieve"
>> }
>> protocol imap {
>>   mail_plugins = " quota trash zlib virtual fts fts_squat imap_quota imap_zlib"
>> }