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During some errors with domain dovecot.org, I didn't receive any answer.

So here is output of dovecot -n

 first_valid_uid = 420
info_log_path = /var/log/dovecot/dovecot.log
lda_mailbox_autocreate = yes
lda_mailbox_autosubscribe = yes
log_path = /var/log/dovecot/errors.log
mail_plugins = " zlib expire acl"
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
namespace {
  inbox = no
  list = children
  location = maildir:/home/vpopmail/Public/Maildir
  prefix = Shared.
  separator = .
  subscriptions = yes
  type = shared
}
namespace {
  hidden = no
  inbox = yes
  list = yes
  location =
  mailbox Junk {
    auto = create
    special_use = \Junk
  }
  mailbox Sent {
    auto = subscribe
    special_use = \Sent
  }
  mailbox Spam {
    auto = subscribe
    special_use = \Junk
  }
  mailbox Trash {
    auto = subscribe
    special_use = \Trash
  }
  prefix = INBOX.
  separator = .
  subscriptions = yes
  type = private
}
passdb {
  driver = vpopmail
}
plugin {
  acl = vfile
  expire = INBOX.Trash
  expire2 = INBOX.Spam
  expire3 = INBOX.Junk
  quota = maildir
  quota_rule2 = INBOX.Trash:ignore
  quota_rule3 = INBOX.Sent:ignore
  sieve = ~/Maildir/sieve/dovecot.sieve
  sieve_after = ~/Maildir/sieve/01_vacation.sieve
  sieve_before = /etc/dovecot/sieve/global.sieve
  sieve_dir = ~/Maildir/sieve
  sieve_global_dir = /etc/dovecot/sieve/
  sieve_quota_max_scripts = 50
  zlib_save = bz2
}
protocols = imap sieve pop3
service anvil {
  chroot = empty
  client_limit = 0
  drop_priv_before_exec = no
  executable = anvil
  extra_groups =
  group =
  idle_kill = 4294967295 secs
  privileged_group =
  process_limit = 1
  process_min_avail = 1
  protocol =
  service_count = 0
  type = anvil
  unix_listener anvil-auth-penalty {
    group =
    mode = 0600
    user =
  }
  unix_listener anvil {
    group =
    mode = 0600
    user =
  }
  user = $default_internal_user
  vsz_limit = 18446744073709551615 B
}
service auth-worker {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = auth -w
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol =
  service_count = 1
  type =
  unix_listener auth-worker {
    group =
    mode = 0600
    user = $default_internal_user
  }
  user =
  vsz_limit = 18446744073709551615 B
}
service auth {
  chroot =
  client_limit = 4096
  drop_priv_before_exec = no
  executable = auth
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 1
  process_min_avail = 0
  protocol =
  service_count = 0
  type =
  unix_listener /var/run/auth-master {
    group = vchkpw
    mode = 0660
    user = vpopmail
  }
  unix_listener /var/run/private/auth {
    group =
    mode = 0666
    user =
  }
  unix_listener auth-client {
    group =
    mode = 0600
    user =
  }
  unix_listener auth-login {
    group =
    mode = 0600
    user = $default_internal_user
  }
  unix_listener auth-master {
    group =
    mode = 0600
    user =
  }
  unix_listener auth-userdb {
    group =
    mode = 0600
    user =
  }
  unix_listener login/login {
    group =
    mode = 0666
    user =
  }
  user = dovecot
  vsz_limit = 8 G
}
service config {
  chroot =
  client_limit = 0
  drop_priv_before_exec = no
  executable = config
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol =
  service_count = 0
  type = config
  unix_listener config {
    group =
    mode = 0600
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}
service dict {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = dict
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol =
  service_count = 0
  type =
  unix_listener dict {
    group =
    mode = 0666
    user =
  }
  user = $default_internal_user
  vsz_limit = 18446744073709551615 B
}
service director {
  chroot =
  client_limit = 0
  drop_priv_before_exec = no
  executable = director
  extra_groups =
  fifo_listener login/proxy-notify {
    group =
    mode = 00
    user =
  }
  group =
  idle_kill = 4294967295 secs
  privileged_group =
  process_limit = 1
  process_min_avail = 0
  protocol =
  service_count = 0
  type =
  unix_listener director-admin {
    group =
    mode = 0600
    user =
  }
  unix_listener login/director {
    group =
    mode = 00
    user =
  }
  user = $default_internal_user
  vsz_limit = 18446744073709551615 B
}
service dns_client {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = dns-client
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol =
  service_count = 0
  type =
  unix_listener dns-client {
    group =
    mode = 0666
    user =
  }
  unix_listener login/dns-client {
    group =
    mode = 0666
    user =
  }
  user = $default_internal_user
  vsz_limit = 18446744073709551615 B
}
service doveadm {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = doveadm-server
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol =
  service_count = 1
  type =
  unix_listener doveadm-server {
    group =
    mode = 0600
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}
service imap-login {
  chroot = login
  client_limit = 0
  drop_priv_before_exec = no
  executable = imap-login
  extra_groups =
  group =
  idle_kill = 0
  inet_listener imap {
    address = 0.0.0.0
    port = 143
    ssl = no
  }
  inet_listener imaps {
    address = 0.0.0.0
    port = 993
    ssl = yes
  }
  privileged_group =
  process_limit = 128
  process_min_avail = 3
  protocol = imap
  service_count = 1
  type = login
  user = dovecot
  vsz_limit = 64 M
}
service imap {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = imap
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 1024
  process_min_avail = 0
  protocol = imap
  service_count = 50
  type =
  unix_listener login/imap {
    group =
    mode = 0666
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}
service lmtp {
  chroot =
  client_limit = 0
  drop_priv_before_exec = no
  executable = lmtp
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol = lmtp
  service_count = 0
  type =
  unix_listener lmtp {
    group =
    mode = 0666
    user =
  }
  user =
  vsz_limit = 0
}
service log {
  chroot =
  client_limit = 0
  drop_priv_before_exec = no
  executable = log
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 1
  process_min_avail = 0
  protocol =
  service_count = 0
  type = log
  user =
  vsz_limit = 18446744073709551615 B
}
service managesieve-login {
  chroot = login
  client_limit = 0
  drop_priv_before_exec = no
  executable = managesieve-login
  extra_groups =
  group =
  idle_kill = 0
  inet_listener sieve {
    address =
    port = 4190
    ssl = no
  }
  privileged_group =
  process_limit = 128
  process_min_avail = 3
  protocol = sieve
  service_count = 1
  type = login
  user = dovecot
  vsz_limit = 64 M
}
service managesieve {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = managesieve
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol = sieve
  service_count = 1
  type =
  unix_listener login/sieve {
    group =
    mode = 0666
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}
service pop3-login {
  chroot = login
  client_limit = 0
  drop_priv_before_exec = no
  executable = pop3-login
  extra_groups =
  group =
  idle_kill = 0
  inet_listener pop3 {
    address = 0.0.0.0
    port = 110
    ssl = no
  }
  inet_listener pop3s {
    address = 0.0.0.0
    port = 995
    ssl = yes
  }
  privileged_group =
  process_limit = 128
  process_min_avail = 3
  protocol = pop3
  service_count = 1
  type = login
  user = dovecot
  vsz_limit = 64 M
}
service pop3 {
  chroot =
  client_limit = 1
  drop_priv_before_exec = no
  executable = pop3
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 1024
  process_min_avail = 0
  protocol = pop3
  service_count = 50
  type =
  unix_listener login/pop3 {
    group =
    mode = 0666
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}
service ssl-params {
  chroot =
  client_limit = 0
  drop_priv_before_exec = no
  executable = ssl-params
  extra_groups =
  group =
  idle_kill = 0
  privileged_group =
  process_limit = 0
  process_min_avail = 0
  protocol =
  service_count = 0
  type = startup
  unix_listener login/ssl-params {
    group =
    mode = 0666
    user =
  }
  user =
  vsz_limit = 18446744073709551615 B
}
ssl_cert = </var/qmail/control/servercert.pem
ssl_cipher_list = ALL:!LOW:!SSLv2
ssl_key = </var/qmail/control/servercert.pem
userdb {
  args = quota_template=quota_rule=*:backend=%q
  driver = vpopmail
}
verbose_proctitle = yes
verbose_ssl = yes
protocol imap {
  imap_max_line_length = 64 k
  mail_plugins = quota imap_quota  zlib imap_zlib acl imap_acl expire
}
protocol pop3 {
  mail_plugins = quota
  pop3_no_flag_updates = no
  pop3_uidl_format = %v-%u
}
protocol sieve {
  managesieve_logout_format = bytes ( in=%i : out=%o )
}
protocol lda {
  auth_socket_path = /var/run/auth-master
  info_log_path = /var/log/dovecot-lda/lda.log
  log_path = /var/log/dovecot-lda/lda-errors.log
  mail_fsync = optimized
  mail_plugins = sieve quota autocreate expire
  postmaster_address = angryni...@medianetork.ro
  sendmail_path = /var/qmail/bin/sendmail
}
protocol lmtp {
  mail_fsync = optimized
}


type of error: COREDUMP
Feb 04 11:49:59 imap(portase.flo...@medianetork.ro): Fatal: master:
service(imap): child 23391 killed with signal 11 (core dumped)

Disabling  of shared mailbox results in correct functioning of dovecot.

To mention again: dovecot version previous to 2.2 was working OK.




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