[Dovecot] lazy_expunge and shared folders

20 May 2014

      Hi,
since migration to Dovecot 2.2 I have troubles with lazy_expunge as soon as
a user shares a folder. The user the folder is shared to cannot login
anymore, dovecot logs Fatal: lazy_expunge: Unknown namespace: '.EXPUNGED/'

When no folder is shared lazy_expunge is working fine, deleted mails are
moved to the expunged namespace and can be recovered without any problems.
Sharing folders works as long as I disable lazy_expunge.

I have used the config (with minor changes) with dovecot 2.0 for years
without any problem. Switching to dovecot 2.2.10 (atrps repository) or
2.2.12 (dovecot enterprise repo) lazy_expunge and acl do not work together
anymore.
Is it a bug, a known limitation or is something wrong with my config?
Any hints are welcome.
Thanks in advance,
Florian
dovecot -n
# 2.2.12.12 (03196f188677): /etc/dovecot/dovecot.conf
# OS: Linux 2.6.32-042stab085.20 x86_64 CentOS release 6.5 (Final)
auth_cache_negative_ttl = 10 mins
auth_cache_size = 10 M
auth_cache_ttl = 2 hours
auth_failure_delay = 10 secs
auth_mechanisms = plain login
auth_socket_path = /var/run/dovecot/auth-userdb
base_dir = /var/run/dovecot/
disable_plaintext_auth = no
first_valid_gid = 105
first_valid_uid = 105
hostname = ...
imap_client_workarounds = delay-newmail tb-extra-mailbox-sep tb-lsub-flags
imap_idle_notify_interval = 10 mins
last_valid_uid = 105
listen = ...
lmtp_save_to_detail_mailbox = yes
login_log_format_elements = user=<%u> method=%m rip=%r lip=%l mpid=%e %c
mail_gid = vimap
mail_home = /var/imap/spool/%1n/%n
mail_location = mdbox:~/mdbox
mail_plugins = " fts fts_lucene acl"
mail_temp_dir = /var/imap/tmp
mail_uid = vimap
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
mbox_write_locks = fcntl
mdbox_rotate_interval = 1 days
namespace {
list = children
location =
mdbox:/var/imap/spool/%%1n/%%n/mdbox:INDEXPVT=/var/imap/spool/%1n/%n/mdbox/shared/%%u
prefix = User/%%u/
separator = /
subscriptions = no
type = shared
}
namespace expunged {
hidden = yes
list = no
location = mdbox:/var/imap/spool/%1n/%n/mdbox:MAILBOXDIR=expunged
prefix = .EXPUNGED/
separator = /
subscriptions = no
type = private
}
namespace inbox {
inbox = yes
location = mdbox:/var/imap/spool/%1n/%n/mdbox
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Learn {
auto = subscribe
}
mailbox Learn/Ham {
auto = subscribe
}
mailbox Learn/Spam {
auto = subscribe
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox Spam {
auto = subscribe
special_use = \Junk
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
mailbox virtual/All {
special_use = \All
}
mailbox virtual/Flagged {
special_use = \Flagged
}
prefix =
separator = /
type = private
}
passdb {
args = /etc/dovecot/master-users
driver = passwd-file
master = yes
}
passdb {
args = /etc/dovecot/dovecot-ldap.conf.ext
driver = ldap
}
passdb {
args = /etc/dovecot/extra-users
driver = passwd-file
}
plugin {
acl = vfile:/var/imap/global-acls:cache_secs=300
acl_shared_dict = file:/var/imap/shared-mailboxes/shared-mailboxes
fts = lucene
fts_autoindex = yes
fts_lucene = whitespace_chars=@.
lazy_expunge = .EXPUNGED/
lazy_expunge_only_last_instance = yes
recipient_delimiter = +
sieve = ~/.dovecot.sieve
sieve_dir = ~/sieve
sieve_max_actions = 32
sieve_max_redirects = 4
sieve_max_script_size = 1M
}
pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
postmaster_address = postmaster@...
protocols = imap pop3 lmtp sieve
service auth {
unix_listener /var/spool/postfix/private/auth {
group = postfix
mode = 0660
user = postfix
}
unix_listener auth-userdb {
group = vimap
mode = 0600
user = vimap
}
user = $default_internal_user
}
service imap-login {
process_min_avail = 4
service_count = 0
}
service imap {
process_limit = 1024
vsz_limit = 256 M
}
service lmtp {
inet_listener lmtp {
address = ...
port = 24
}
}
service managesieve-login {
inet_listener sieve {
port = 4190
}
inet_listener sieve_deprecated {
port = 2000
}
service_count = 1
vsz_limit = 64 M
}
service pop3-login {
inet_listener pop3s {
port = 995
ssl = yes
}
process_min_avail = 4
service_count = 0
}
service pop3 {
process_limit = 512
}
ssl_cert = 