Users are unable to access to their mailboxes after upgrading to dovecot-2.2.36-3.el7

Solution In Progress - Updated -

Issue

  • pop3, imap and lmpt start to dump core files after upgrading to dovecot-2.2.36-3.el7.x86_64.
  • No user can access their mailbox.
  • This problem does not occur with the previous version, dovecot-2.2.10-8.el7.

Environment

  • Red Hat Enterprise 8 / dovecot-2.2.36-5.el8.x86_64
  • Red Hat Enterprise 7 / dovecot-2.2.36-3.el7

  • Quota is configured and /etc/dovecot/conf.d/90-quota.conf has configuration like below.

plugin {
  #quota_rule = *:storage=1G
  #quota_rule2 = Trash:storage=+100M
  # LDA/LMTP allows saving the last mail to bring user from under quota to
  # over quota, if the quota doesn't grow too high. Default is to allow as
  # long as quota will stay under 10% above the limit. Also allowed e.g. 10M.
  quota_grace = 
}
plugin {
  quota_warning = storage=90%% quota-warning 90 %u
  quota_warning2 = storage=80%% quota-warning 80 %u
}
service quota-warning {
  executable = script /usr/local/bin/quota-warning.sh
  user = dovecot
  unix_listener quota-warning {
    #user = vmail
    user = dovecot
    mode = 0666
  }
}
plugin {
  #quota = dirsize:User quota
  #quota = maildir:User quota
  #quota = dict:User quota::proxy::quota
  quota = dict:User quota::file:%h/Maildir/dovecot-quota
}
plugin {
  #quota = dict:user::proxy::quota
  #quota2 = dict:domain:%d:proxy::quota_domain
  quota_rule = *:storage=102400
  }

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