[Dovecot] Doveadm sometimes failed "to iterate through some users" after upgrade to 2.2

[Alessio Cecchi]

Hi,

I'm running every week in cron "doveadm expunge -A mailbox Spam before 
30d" and monthly "doveadm quota recalc -A".

After the upgrade to dovecot 2.2.12 (from 2.1.17), "doveadm -A" 
sometimes exit with this error:

doveadm(user at domain.com): Error: User listing returned failure
doveadm: Error: Failed to iterate through some users
# echo $?
75

If I re-run the same command the user where doveadm stops changeing 
(always in alphabetical order):

info@
mario@
pippo@
zazza@

and finally, after 3 or 4 run, ends with success.

I have enable debug (via doveadm -D and auth/mail debub in 
10-logging.con) but there are no errors or difference in the log when 
doveadm exit with the error (error code is 75).

If I run

# doveadm expunge -A mailbox Spam savedbefore 30d

doveadm works fine

Can somebody help me?

Here is my configuration:

# dovecot -n
# 2.2.12: /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-5-amd64 x86_64 Debian 6.0.9
auth_debug = yes
auth_master_user_separator = *
auth_verbose = yes
deliver_log_format = msgid=%m, from=%f, subject="%s": %$
dict {
   expire = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
   sqlquota = mysql:/etc/dovecot/dovecot-dict-sql.conf.ext
}
disable_plaintext_auth = no
dotlock_use_excl = no
first_valid_gid = 89
first_valid_uid = 89
imap_client_workarounds = delay-newmail tb-extra-mailbox-sep tb-lsub-flags
imap_idle_notify_interval = 29 mins
imap_logout_format = in=%i out=%o session=<%{session}>
last_valid_gid = 89
last_valid_uid = 89
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
listen = *
mail_debug = yes
mail_fsync = always
mail_location = maildir:~/Maildir
mail_nfs_index = yes
mail_nfs_storage = yes
mail_plugins = quota expire
maildir_very_dirty_syncs = yes
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character subaddress comparator-i;ascii-numeric relational regex 
imap4flags copy include variables body enotify environment mailbox date 
ihave vnd.dovecot.duplicate
mmap_disable = yes
namespace {
   list = children
   location = maildir:%%h/Maildir:INDEX=~/Maildir/shared/%%u
   prefix = shared/%%n/
   separator = /
   subscriptions = no
   type = shared
}
namespace inbox {
   inbox = yes
   location =
   mailbox Drafts {
     auto = subscribe
     special_use = \Drafts
   }
   mailbox Sent {
     auto = subscribe
     special_use = \Sent
   }
   mailbox "Sent Messages" {
     special_use = \Sent
   }
   mailbox Spam {
     auto = subscribe
     special_use = \Junk
   }
   mailbox Trash {
     auto = subscribe
     special_use = \Trash
   }
   prefix =
   separator = /
}
passdb {
   args = username_format=%Ld /etc/dovecot/extra/alias-domains-denylogin.txt
   deny = yes
   driver = passwd-file
}
passdb {
   args = /etc/dovecot/extra/master-users
   driver = passwd-file
   master = yes
   pass = yes
}
passdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
plugin {
   expire = Trash
   expire2 = Spam
   expire_dict = proxy::expire
   quota = maildir:UserQuota
   quota2 = dict:Quota Usage::noenforcing:proxy::sqlquota
   quota_grace = 10M
   quota_rule2 = Trash:storage=+100M
   quota_warning = storage=95%% quota-warning 95 %u
   quota_warning2 = storage=80%% quota-warning 80 %u
   sieve = ~/.dovecot.sieve
   sieve_before = /etc/dovecot/sieve/before.sieve
   sieve_dir = ~/sieve
   sieve_extensions = +vnd.dovecot.duplicate -vacation
}
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s, 
bytes=%i/%o, session=<%{session}>
protocols = imap pop3 sieve
service auth-worker {
   process_limit = 1000
}
service auth {
   client_limit = 5500
   unix_listener auth-userdb {
     group = vchkpw
     mode = 0660
     user = vpopmail
   }
}
service dict {
   process_limit = 300
   unix_listener dict {
     group = vchkpw
     mode = 0660
     user = vpopmail
   }
}
service imap-login {
   process_min_avail = 4
   service_count = 0
}
service imap {
   process_limit = 4000
   service_count = 100
}
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
}
service pop3-login {
   service_count = 0
}
service pop3 {
   process_limit = 1023
   service_count = 100
}
service quota-warning {
   executable = script /etc/dovecot/scripts/quota-warning.sh
   unix_listener quota-warning {
     user = vpopmail
   }
   user = vpopmail
}
ssl_cert = </etc/dovecot/ssl/wildcard-myemail.net.pem
ssl_key = </etc/dovecot/ssl/wildcard-myemail.net.key
submission_host = localhost
userdb {
   args = /etc/dovecot/dovecot-sql.conf.ext
   driver = sql
}
protocol lda {
   mail_location = maildir:~/Maildir:INDEX=MEMORY
   mail_plugins = quota expire sieve
}
protocol imap {
   mail_max_userip_connections = 15
   mail_plugins = quota expire imap_quota
}
protocol sieve {
   mail_max_userip_connections = 2
}
protocol pop3 {
   mail_max_userip_connections = 5
}

-- 
Alessio Cecchi is:
@ ILS -> http://www.linux.it/~alessice/
on LinkedIn -> http://www.linkedin.com/in/alessice
Assistenza Sistemi GNU/Linux -> http://www.cecchi.biz
Cloud Email Hosting -> http://www.qboxmail.com
@ PLUG -> ex-Presidente, adesso senatore a vita, http://www.prato.linux.it