dying on osx

[Mike Makuch]

OSX 10.13.6 High Sierra, dovecot 2.3.2.1

dovecot starts up and runs but dies as soon as my mail client makes a 
request with log and config below.

And advice appreciated.

Thanks

Mike



20180810-083730 auth: Debug: auth client connected (pid=77432)

20180810-083730 auth: Debug: client in: AUTH    1    PLAIN 
service=imap    secured    session=xo1p2BRzZNd/AAAB lip=127.0.0.1    
rip=127.0.0.1    lport=143    rport=55140
20180810-083730 auth: Debug: client passdb out: CONT    1
20180810-083730 auth: Debug: client in: CONT    1 AG1rbQBta20xMjM= 
(previous base64 data may contain sensitive data)
20180810-083730 auth: Debug: static(mkm,127.0.0.1,<xo1p2BRzZNd/AAAB>): 
lookup
20180810-083730 auth: Debug: client passdb out: OK    1 user=mkm    
host=localhost    nopasswd=y
20180810-083730 auth: Debug: master in: REQUEST    4201906177 77432    
1    b8126b4b71be2959fc7716888eccc566 session_pid=77433    
request_auth_token
20180810-083730 auth-worker(77426): Debug: 
passwd(mkm,127.0.0.1,<xo1p2BRzZNd/AAAB>): lookup
20180810-083730 auth: Debug: master userdb out: USER 4201906177    
mkm    system_groups_user=mkm    uid=503 gid=20    home=/Users/mkm 
auth_token=4d2bb44168df3d63e4e1bb352e59de632bc7da49
20180810-083730 imap-login: Info: Login: user=<mkm>, method=PLAIN, 
rip=127.0.0.1, lip=127.0.0.1, mpid=77433, secured, 
session=<xo1p2BRzZNd/AAAB>
20180810-083730 imap(mkm)<77433><xo1p2BRzZNd/AAAB>: Fatal: 
setgroups(505) failed: Too many extra groups

# doveconf -n
# 2.3.2.1 (0719df592): /usr/local/etc/dovecot/dovecot.conf
# OS: Darwin 17.7.0 x86_64
# Hostname: pine
auth_debug = yes
auth_debug_passwords = yes
default_internal_user = _dovecot
default_login_user = _dovenull
disable_plaintext_auth = no
listen = 127.0.0.1
log_path = /var/log/dovecot
log_timestamp = "%Y%m%d-%H%M%S "
mail_debug = yes
mail_gid = staff
mail_location = mbox:~/Mail:INBOX=/var/mail/%u
mail_privileged_group = mail
mail_uid = _dovecot
passdb {
   args = password=*** host=localhost nopasswd=y
   driver = static
}
passdb {
   args = login
   driver = pam
}
protocols = imap
service auth {
   user = root
}
service imap-login {
   inet_listener imap {
     address = *
     port = 143
   }
}
ssl = no
userdb {
   driver = passwd
}