[Dovecot] Dovecat crash signal 11 core dump

[Ray Kirby]

Vpopmail 5.5.0

Dovecot -n
# 2.0.rc1: /usr/local/etc/dovecot/dovecot.conf
# OS: Linux 2.6.31.5-127.fc12.i686.PAE i686 Fedora release 12 (Constantine)
auth_debug = yes
auth_debug_passwords = yes
auth_verbose = yes
debug_log_path = /var/log/dovecot
default_internal_user = vpopmail
disable_plaintext_auth = no
log_path = /var/log/dovecot
mail_debug = yes
mail_gid = 508
mail_location = maildir: /home/vpopmail/domains/%d/%n/Maildir
mail_uid = 508
passdb {
   args = cache_key=%u%s:backend=%q
   driver = vpopmail
}
service auth {
   unix_listener auth-userdb {
     group = vpopmail
     user = vpopmail
   }
}
ssl = no
userdb {
   driver = vpopmail
}
protocol imap {
   imap_client_workarounds = tb-extra-mailbox-sep
   mail_max_userip_connections = 20
}


Problem:

Jul 08 12:35:08 auth: Debug: Loading modules from directory: 
/usr/local/lib/dovecot/auth
Jul 08 12:35:08 auth: Debug: new auth connection: pid=5514
Jul 08 12:35:08 auth: Debug: client in: AUTH    1    PLAIN   
  service=imap    lip=30.30.14.22    rip=192.168.0.100    lport=143   
  rport=53112
Jul 08 12:35:08 auth: Debug: client out: CONT    1
Jul 08 12:35:08 auth: Debug: client in: CONT    1   
  AHJraXJieaBteUxprmV1cC5jb20AYWJzcmNr
Jul 08 12:35:08 auth: Debug: vpopmail(user at mydomain.com,192.168.0.100): 
lookup user=user domain=mydomain.com
Jul 08 12:35:08 auth: Debug: client out: OK    1    user=user at mydomain.com
Jul 08 12:35:08 auth: Debug: master in: REQUEST    1    5514    1   
  4a87d9ed9185eb0794667c5f7adb724f
Jul 08 12:35:08 auth: Debug: vpopmail(user at mydomain.com,192.168.0.100): 
lookup user=user domain=mydomain.com

Jul 08 12:35:08 master: Error: service(auth): child 5516 killed with 
signal 11 (core dumped)
Jul 08 12:35:08 master: Error: service(auth): command startup failed, 
throttling

Jul 08 12:35:08 imap-login: Info: Internal login failure (auth failed, 1 
attempts): user=<user at mydomain.com>, method=PLAIN, rip=192.168.0.100, 
lip=30.30.14.22, mpid=5517

Thanks