[Dovecot] lmtp panic in proxy lmtp director

[Xavier Pons]

Hi, we are getting some  core dumps with signal 6 in ltmp on a dovecot 
director proxy server,
like this:

Dec  5 14:31:51 sproxy1 dovecot: lmtp(29999): Panic: file lmtp-proxy.c: 
line 376 (lmtp_proxy_output_timeout): assertion failed: 
(proxy->data_input->eof)
Dec  5 14:31:51 sproxy1 dovecot: lmtp(29999): Error: Raw backtrace: 
/usr/lib64/dovecot/libdovecot.so.0() [0x363323d99a] -> 
/usr/lib64/dovecot/libdovecot.so.0() [0x363323d9e6] -> 
/usr/lib64/dovecot/libdovecot.so.0(i_error+0) [0x3633216f8f] -> 
dovecot/lmtp() [0x406e57] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handle_timeouts+0xd4) 
[0x3633248ff4] -> 
/usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x5b) 
[0x3633249bdb] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x28) 
[0x3633248c58] -> 
/usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) 
[0x3633236fc3] -> dovecot/lmtp(main+0x154) [0x403f84] -> 
/lib64/libc.so.6(__libc_start_main+0xfd) [0x373cc1ec5d] -> 
dovecot/lmtp() [0x403d69]
Dec  5 14:31:51 sproxy1 abrt[30067]: saved core dump of pid 29999 
(/usr/libexec/dovecot/lmtp) to 
/var/spool/abrt/ccpp-1323091911-29999.new/coredump (1368064 bytes)
Dec  5 14:31:51 sproxy1 dovecot: master: Error: service(lmtp): child 
29999 killed with signal 6 (core dumped)

we have something misconfigured  or it's a bug on this dovecot version?

our doveconf -n is:
# 2.0.15: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-71.29.1.el6.x86_64 x86_64 CentOS Linux release 6.0 
(Final)
auth_cache_size = 3 k
auth_cache_ttl = 15 mins
auth_verbose = yes
base_dir = /var/run/dovecot/
default_client_limit = 30000
default_process_limit = 5000
director_doveadm_port = 990
director_mail_servers = 10.80.82.21 10.80.82.22
director_servers = 10.80.82.11 10.80.82.12
doveadm_proxy_port = 24245
lmtp_proxy = yes
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
passdb {
   args = proxy=y nopassword=y starttls=any-cert
   driver = static
}
postmaster_address = xavier.pons at uib.es
protocols = imap pop3 lmtp sieve
service auth {
   client_limit = 27048
   unix_listener /var/spool/postfix/private/auth {
     mode = 0666
   }
   unix_listener auth-userdb {
     group = dovecot
     mode = 0660
   }
}
service director {
   fifo_listener login/proxy-notify {
     mode = 0666
   }
   inet_listener {
     port = 991
   }
   inet_listener director-doveadm {
     port = 990
   }
   unix_listener director-userdb {
     mode = 0660
   }
   unix_listener login/director {
     mode = 0666
   }
}
service doveadm {
   inet_listener {
     port = 24245
   }
}
service imap-login {
   executable = imap-login director
   inet_listener imap {
     port = 143
   }
   inet_listener imaps {
     port = 993
     ssl = yes
   }
}
service lmtp {
   inet_listener lmtp {
     port = 30025
   }
}
service managesieve-login {
   executable = managesieve-login director
}
service pop3-login {
   executable = pop3-login director
   inet_listener pop3 {
     port = 110
   }
   inet_listener pop3s {
     port = 995
     ssl = yes
   }
}
ssl = required
ssl_cert = </etc/pki/tls/certs/imap.crt
ssl_key = </etc/pki/tls/private/imap.uib.es_privatekey.pem
syslog_facility = local1
verbose_proctitle = yes
protocol lmtp {
   auth_socket_path = director-userdb
   passdb {
     args = /etc/dovecot/dovecot-ldap-pass.conf.lmtp
     driver = ldap
   }
}
protocol doveadm {
   auth_socket_path = director-userdb
}
protocol imap {
   mail_max_userip_connections = 20
}
protocol pop3 {
   pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
}

Xavier

-- 
xavier.pons at uib.es
Centre de Tecnologies de la Informació
Universitat Illes Balears