Auth process sometimes stop responding after upgrade

[Simone Lazzaris]

> Hi all, again;
> 
> I've enabled the core dumps and let it go for some day waiting for the issue
> to reoccur.
> 
> Meantime I've also upgraded the poolmon script, as Sami suggested.
> 
> It seems that the upgrade has scared the issue away, because it no longer
> occurred.
> 
> Maybe the problem is related to the way the old poolmon talked to the
> director daemon? I'm not very inclined to downgrade poolmon to catch a
> traceback, but can do if neccessary.

Well, maybe it's not necessary ;)
I've performed some maintenance operations on the backends and that triggered the 
crash. It seems that something goes wrong where one backend come back online.

Unfortunately, the core was not dumped.... And I don't know what to do: the director 
service was not chrooted, and ulimit -c is unlimited.

>From the log file:

Sep 18 12:21:46 imap-front4 dovecot: director: Panic: file doveadm-connection.c: line 1097 
(doveadm_connection_deinit): assertion failed: (conn->to_ring_sync_abort == NULL)
Sep 18 12:21:46 imap-front4 dovecot: director: Error: Raw backtrace: /usr/local/lib/dovecot/
libdovecot.so.0(+0xa15be) [0xb77345be] -> /usr/local/lib/dovecot/libdovecot.so.
0(+0xa1641) [0xb7734641] -> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0xb76ba35e] 
-> dovecot/director() [0x80574f7] -> dovecot/director() [0x8057f03] -> /usr/local/lib/
dovecot/libdovecot.so.0(io_loop_call_io+0x6b) [0xb774d3db] -> /usr/local/lib/dovecot/
libdovecot.so.0(io_loop_handler_run_internal+0xfe) [0xb774ee1e] -> /usr/local/lib/dovecot/
libdovecot.so.0(io_loop_handler_run+0x46) [0xb774d496] -> /usr/local/lib/dovecot/
libdovecot.so.0(io_loop_run+0x48) [0xb774d658] -> /usr/local/lib/dovecot/libdovecot.so.
0(master_service_run+0x2e) [0xb76c645e] -> dovecot/director(main+0x49e) [0x804cf5e] -> 
/lib/i386-linux-gnu/i686/cmov/libc.so.6(__libc_start_main+0xe6) [0xb753be46] -> dovecot/
director() [0x804d081]
Sep 18 12:21:46 imap-front4 dovecot: director: Fatal: master: service(director): child 7941 
killed with signal 6 (core not dumped)
Sep 18 12:21:46 imap-front4 dovecot: director: Connecting to 212.183.164.161:9090 (as 
212.183.164.164): Initial connection
Sep 18 12:21:46 imap-front4 dovecot: director: Incoming connection from director 
212.183.164.163/in

My current config:

root at imap-front4:~# doveconf -n
# 2.2.36 (1f10bfa63): /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 3.2.0-4-686-pae i686 Debian 7.11 
# Hostname: imap-front4
auth_mechanisms = plain login digest-md5 cram-md5 apop scram-sha-1
auth_verbose = yes
auth_verbose_passwords = plain
base_dir = /var/run/dovecot/
default_login_user = nobody
director_doveadm_port = 9091
director_mail_servers = 192.168.1.142 192.168.1.143 192.168.1.216 192.168.1.217 
192.168.1.218 192.168.1.219
director_servers = 212.183.164.161 212.183.164.162 212.183.164.163 212.183.164.164
disable_plaintext_auth = no
listen = *
passdb {
  args = /usr/local/etc/dovecot/sql.conf
  driver = sql
}
protocols = imap pop3
service director {
  chroot = 
  fifo_listener login/proxy-notify {
    mode = 0666
  }
  inet_listener {
    port = 9090
  }
  unix_listener director-userdb {
    mode = 0600
  }
  unix_listener login/director {
    mode = 0666
  }
}
service imap-login {
  executable = imap-login director
  service_count = 0
  vsz_limit = 128 M
}
service pop3-login {
  executable = pop3-login director
  service_count = 0
  vsz_limit = 128 M
}
ssl_cert = </usr/local/etc/dovecot/imapd.pem
ssl_key =  # hidden, use -P to show it
ssl_protocols = !SSlv2 !SSLv3
syslog_facility = local5
userdb {
  driver = prefetch
}



*Simone Lazzaris*
*Qcom S.p.A.*
simone.lazzaris at qcom.it[1] | www.qcom.it[2]
* LinkedIn[3]* | *Facebook*[4]
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