<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><div class="">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.</div><div class="">Yesterday I stumbled upon these log lines:</div><div class=""><br class=""></div><div class=""><font face="Menlo" class="">2019-11-18 20:17:51 lmtp(17274): Info: Connect from 172.22.1.6</font></div><div class=""><font face="Menlo" class="">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)</font></div><div class=""><font face="Menlo" class="">2019-11-18 20:17:51 lmtp(17274): Fatal: master: service(lmtp): child 17274 killed with signal 6 (core not dumped - <a href="https://dovecot.org/bugreport.html#coredumps" class="">https://dovecot.org/bugreport.html#coredumps</a> - set /proc/sys/fs/suid_dumpable to 2)</font></div></div><div class=""><br class=""></div><div class="">Is a core dump required to find the source of that error?</div><div class=""><br class=""></div><div class="">Thanks for any help!</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><font face="Menlo" class="">$ doveconf -n</font></div><div class=""><font face="Menlo" class=""># 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf</font></div><div class=""><font face="Menlo" class=""># OS: Linux 4.9.0-8-amd64 x86_64</font></div><div class=""><font face="Menlo" class=""># Hostname: <a href="http://m03.company.com" class="">m03.company.com</a></font></div><div class=""><font face="Menlo" class="">auth_cache_negative_ttl = 65 secs</font></div><div class=""><font face="Menlo" class="">auth_cache_ttl = 3 mins</font></div><div class=""><font face="Menlo" class="">auth_cache_verify_password_with_worker = yes</font></div><div class=""><font face="Menlo" class="">auth_mechanisms = plain login</font></div><div class=""><font face="Menlo" class="">auth_verbose = yes</font></div><div class=""><font face="Menlo" class="">debug_log_path = /dev/stdout</font></div><div class=""><font face="Menlo" class="">default_client_limit = 10400</font></div><div class=""><font face="Menlo" class="">default_process_limit = 1024</font></div><div class=""><font face="Menlo" class="">default_vsz_limit = 1 G</font></div><div class=""><font face="Menlo" class="">deliver_log_format = msgid=%m: %s %{session_time} %$</font></div><div class=""><font face="Menlo" class="">director_mail_servers = 10.10.10.2 10.10.10.3</font></div><div class=""><font face="Menlo" class="">director_servers = 10.10.1.2 10.10.1.3</font></div><div class=""><font face="Menlo" class="">imap_id_log = *</font></div><div class=""><font face="Menlo" class="">imap_max_line_length = 2 M</font></div><div class=""><font face="Menlo" class="">import_environment = TZ CORE_OUTOFMEM CORE_ERROR</font></div><div class=""><font face="Menlo" class="">info_log_path = /dev/stdout</font></div><div class=""><font face="Menlo" class="">instance_name = dovecot_director</font></div><div class=""><font face="Menlo" class="">listen = 10.10.1.3,::</font></div><div class=""><font face="Menlo" class="">lmtp_proxy = yes</font></div><div class=""><font face="Menlo" class="">log_path = /dev/stderr</font></div><div class=""><font face="Menlo" class="">log_timestamp = "%Y-%m-%d %H:%M:%S "</font></div><div class=""><font face="Menlo" class="">login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c %k session=<%{session}></font></div><div class=""><font face="Menlo" class="">mail_max_userip_connections = 250</font></div><div class=""><font face="Menlo" class="">passdb {</font></div><div class=""><font face="Menlo" class=""> args = /etc/dovecot/sql/dovecot-dict-sql-passdb.conf</font></div><div class=""><font face="Menlo" class=""> driver = sql</font></div><div class=""><font face="Menlo" class=""> result_failure = return-fail</font></div><div class=""><font face="Menlo" class=""> result_internalfail = return-fail</font></div><div class=""><font face="Menlo" class=""> result_success = continue-ok</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">passdb {</font></div><div class=""><font face="Menlo" class=""> args = proxy=y starttls=any-cert <a href="mailto:master=director@m03.company.com" class="">master=director@m03.company.com</a> pass=#hidden_use-P_to_show# nopassword=y</font></div><div class=""><font face="Menlo" class=""> driver = static</font></div><div class=""><font face="Menlo" class=""> skip = unauthenticated</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s, uidl=%u</font></div><div class=""><font face="Menlo" class="">protocols = imap lmtp pop3</font></div><div class=""><font face="Menlo" class="">service auth-worker {</font></div><div class=""><font face="Menlo" class=""> user = $default_internal_user</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">service director {</font></div><div class=""><font face="Menlo" class=""> fifo_listener login/proxy-notify {</font></div><div class=""><font face="Menlo" class=""> mode = 0600</font></div><div class=""><font face="Menlo" class=""> user = $default_login_user</font></div><div class=""><font face="Menlo" class=""> }</font></div><div class=""><font face="Menlo" class=""> inet_listener {</font></div><div class=""><font face="Menlo" class=""> port = 9090</font></div><div class=""><font face="Menlo" class=""> }</font></div><div class=""><font face="Menlo" class=""> unix_listener director-userdb {</font></div><div class=""><font face="Menlo" class=""> mode = 0600</font></div><div class=""><font face="Menlo" class=""> user = vmail</font></div><div class=""><font face="Menlo" class=""> }</font></div><div class=""><font face="Menlo" class=""> unix_listener login/director {</font></div><div class=""><font face="Menlo" class=""> mode = 0666</font></div><div class=""><font face="Menlo" class=""> }</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">service imap-login {</font></div><div class=""><font face="Menlo" class=""> executable = imap-login director</font></div><div class=""><font face="Menlo" class=""> process_min_avail = 2</font></div><div class=""><font face="Menlo" class=""> vsz_limit = 1 G</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">service lmtp {</font></div><div class=""><font face="Menlo" class=""> inet_listener lmtp {</font></div><div class=""><font face="Menlo" class=""> port = 24</font></div><div class=""><font face="Menlo" class=""> }</font></div><div class=""><font face="Menlo" class=""> process_min_avail = 2</font></div><div class=""><font face="Menlo" class=""> unix_listener lmtp {</font></div><div class=""><font face="Menlo" class=""> mode = 00</font></div><div class=""><font face="Menlo" class=""> }</font></div><div class=""><font face="Menlo" class=""> user = vmail</font></div><div class=""><font face="Menlo" class=""> vsz_limit = 1 G</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">service log {</font></div><div class=""><font face="Menlo" class=""> user = dovenull</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">service pop3-login {</font></div><div class=""><font face="Menlo" class=""> executable = pop3-login director</font></div><div class=""><font face="Menlo" class=""> process_min_avail = 2</font></div><div class=""><font face="Menlo" class=""> vsz_limit = 1 G</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">service pop3 {</font></div><div class=""><font face="Menlo" class=""> user = vmail</font></div><div class=""><font face="Menlo" class="">}</font></div><div class=""><font face="Menlo" class="">ssl_cert = </etc/ssl/mail/cert.pem</font></div><div class=""><font face="Menlo" class="">ssl_client_ca_dir = /etc/ssl/certs/</font></div><div class=""><font face="Menlo" class="">ssl_dh = # hidden, use -P to show it</font></div><div class=""><font face="Menlo" class="">ssl_key = # hidden, use -P to show it</font></div><div class=""><font face="Menlo" class="">ssl_prefer_server_ciphers = yes</font></div><div class=""><font face="Menlo" class="">submission_host = postfix:588</font></div><div class=""><font face="Menlo" class="">protocol lmtp {</font></div><div class=""><font face="Menlo" class=""> auth_socket_path = director-userdb</font></div><div class=""><font face="Menlo" class="">}</font></div></body></html>