Fatal: master: service(imap): child 20258 killed with signal 6 (core not dumped - set service imap { drop_priv_before_exec=yes })

[CJ Keist]

All,
   Just move our mail servers over to a new mail server running postfix 
2.11.1 and dovecot 2.2.13 and getting the subject line errors in my 
/var/adm/files.  People are complaining of loosing their connections to 
the mail server.

I've been able to google this error but haven't found fix for this yet. 
  NOt sure where to put the drop-priv option in the config files either.

Any suggestions?

Var adm message:
Jul 10 08:54:29 mail2 dovecot: [ID 583609 mail.crit] imap(chen): Fatal: 
master: service(imap): child 20258 killed with signal 6 (core not dumped 
- set service imap { drop_priv_before_exec=yes })

Here is config output:

root at mail2:/userM/mail-services/dovecot/sbin# ./dovecot -n
# 2.2.13: /userM/mail-services/dovecot/etc/dovecot/dovecot.conf
# OS: SunOS 5.11 i86pc
auth_failure_delay = 5 secs
auth_mechanisms = plain login cram-md5
auth_worker_max_count = 300
base_dir = /userM/mail-services/dovecot/var/run/dovecot/
disable_plaintext_auth = no
hostname = mail2.engr.colostate.edu
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 duplicate
namespace inbox {
   inbox = yes
   location =
   mailbox Drafts {
     special_use = \Drafts
   }
   mailbox Junk {
     special_use = \Junk
   }
   mailbox Sent {
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Trash {
     special_use = \Trash
   }
   prefix =
}
passdb {
   driver = pam
}
passdb {
   driver = passwd
}
postmaster_address = cjay at engr.colostate.edu
service auth {
   unix_listener /var/lib/postfix/private/auth {
     mode = 0666
   }
   unix_listener auth-userdb {
     group = postfix
     mode = 0666
     user = postfix
   }
   user = root
}
service imap-login {
   inet_listener imap {
     port = 143
   }
   inet_listener imaps {
     port = 993
     ssl = yes
   }
}
service pop3-login {
   inet_listener pop3 {
     port = 110
   }
   inet_listener pop3s {
     port = 995
     ssl = yes
   }
}
ssl_cert = </userM/mail-services/dovecot/etc/ssl/dovecot.pem
ssl_key = </userM/mail-services/dovecot/etc/ssl/privkey.pem
userdb {
   args = blocking=yes
   driver = passwd
}
protocol imap {
   mail_max_userip_connections = 50
}
protocol lda {
   mail_plugins = sieve
}


-- 
C. J. Keist                     Email: cj.keist at colostate.edu
Systems Group Manager           Solaris 10 OS (SAI)
Engineering Network Services    Phone: 970-491-0630
College of Engineering, CSU     Fax:   970-491-5569
Ft. Collins, CO 80523-1301

All I want is a chance to prove 'Money can't buy happiness'