Panic: file smtp-client-connection.c: line 1142 (smtp_client_connection_established)

19 Nov 2019


      I'm using dovecot in a multi server setup. Two directors forward pop3, imap and smtp to  backend dovecots with their central storage on NFS.
Yesterday I stumbled upon these log lines:
2019-11-18 20:17:51 lmtp(17274): Info: Connect from 172.22.1.6
2019-11-18 20:17:51 lmtp(17274): Panic: file smtp-client-connection.c: line 1142 (smtp_client_connection_established): assertion failed: (!conn->connect_succeeded)
2019-11-18 20:17:51 lmtp(17274): Fatal: master: service(lmtp): child 17274 killed with signal 6 (core not dumped - https://dovecot.org/bugreport.html#coredumps - set /proc/sys/fs/suid_dumpable to 2)
Is a core dump required to find the source of that error?
Thanks for any help!
$ doveconf -n
# 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf
# OS: Linux 4.9.0-8-amd64 x86_64
# Hostname: m03.company.com
auth_cache_negative_ttl = 65 secs
auth_cache_ttl = 3 mins
auth_cache_verify_password_with_worker = yes
auth_mechanisms = plain login
auth_verbose = yes
debug_log_path = /dev/stdout
default_client_limit = 10400
default_process_limit = 1024
default_vsz_limit = 1 G
deliver_log_format = msgid=%m: %s %{session_time} %$
director_mail_servers = 10.10.10.2 10.10.10.3
director_servers = 10.10.1.2 10.10.1.3
imap_id_log = *
imap_max_line_length = 2 M
import_environment = TZ CORE_OUTOFMEM CORE_ERROR
info_log_path = /dev/stdout
instance_name = dovecot_director
listen = 10.10.1.3,::
lmtp_proxy = yes
log_path = /dev/stderr
log_timestamp = "%Y-%m-%d %H:%M:%S "
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k session=<%{session}>
mail_max_userip_connections = 250
passdb {
args = /etc/dovecot/sql/dovecot-dict-sql-passdb.conf
driver = sql
result_failure = return-fail
result_internalfail = return-fail
result_success = continue-ok
}
passdb {
args = proxy=y starttls=any-cert master=director@m03.company.com pass=#hidden_use-P_to_show# nopassword=y
driver = static
skip = unauthenticated
}
pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s, uidl=%u
protocols = imap lmtp pop3
service auth-worker {
user = $default_internal_user
}
service director {
fifo_listener login/proxy-notify {
mode = 0600
user = $default_login_user
}
inet_listener {
port = 9090
}
unix_listener director-userdb {
mode = 0600
user = vmail
}
unix_listener login/director {
mode = 0666
}
}
service imap-login {
executable = imap-login director
process_min_avail = 2
vsz_limit = 1 G
}
service lmtp {
inet_listener lmtp {
port = 24
}
process_min_avail = 2
unix_listener lmtp {
mode = 00
}
user = vmail
vsz_limit = 1 G
}
service log {
user = dovenull
}
service pop3-login {
executable = pop3-login director
process_min_avail = 2
vsz_limit = 1 G
}
service pop3 {
user = vmail
}
ssl_cert =

Dirk

Stephan Bosch

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