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

[Dirk]

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 at 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 = </etc/ssl/mail/cert.pem
ssl_client_ca_dir = /etc/ssl/certs/
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
ssl_prefer_server_ciphers = yes
submission_host = postfix:588
protocol lmtp {
  auth_socket_path = director-userdb
}
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