Dovecot release v2.3.7

[Eirik Rye]

Downgrading to 2.3.6 did indeed resolve the issue.

Our Directors are running Ubuntu 18.04.

Regards,
Eirik Rye

On 16/07/2019 11:17, Eirik Rye via dovecot wrote:
> Version 2.3.7 appears to break director ring sync. After upgrading, our 
> logs are full of these kinds of messages:
> 
> Jul 14 04:09:20 yyy dovecot: director: Error: director: User xxx host 
> lookup failed: Timeout because ring not synced - queued for 30 secs 
> (Ring not synced for 1410 secs, hash=271838221)
> Jul 14 04:09:20 yyy dovecot: director: Error: director: User xxx host 
> lookup failed: Timeout because ring not synced - queued for 30 secs 
> (Ring not synced for 1410 secs, hash=3482757093)
> 
> As well as:
> 
> Jul 14 04:09:21 yyy dovecot: director: Error: Ring SYNC seq=53 appears 
> to have got lost, resending
> 
> These are absent from the logs prior to July 12.
> 
> I have downgraded to 2.3.6 in hopes of resolving the issue.
> 
> Regards,
> Eirik Rye
> 
> On 12/07/2019 14:29, Aki Tuomi via dovecot wrote:
>> Hi!
>>
>> We are pleased to release Dovecot release v2.3.7.
>>
>> Tarball is available at
>>
>> https://dovecot.org/releases/2.3/dovecot-2.3.7.tar.gz
>> https://dovecot.org/releases/2.3/dovecot-2.3.7.tar.gz.sig
>>
>> Binary packages are available at https://repo.dovecot.org/
>>
>> Changes
>> -------
>>
>> * fts-solr: Removed break-imap-search parameter
>> + Added more events for the new statistics, see
>>    https://doc.dovecot.org/admin_manual/list_of_events/
>> + mail-lua: Add IMAP metadata accessors, see
>>    https://doc.dovecot.org/admin_manual/lua/
>> + Add event exporters that allow exporting raw events to log files and
>>    external systems, see
>>    https://doc.dovecot.org/configuration_manual/event_export/
>> + SNIPPET is now PREVIEW and size has been increased to 200 characters.
>> + Add body option to fts_enforced. This triggers building FTS index only
>>    on body search, and an error using FTS index fails the search rather
>>    than reads through all the mails.
>> - Submission/LMTP: Fixed crash when domain argument is invalid in a
>>    second EHLO/LHLO command.
>> - Copying/moving mails using Maildir format loses IMAP keywords in the
>>    destination if the mail also has no system flags.
>> - mail_attachment_detection_options=add-flags-on-save caused email body
>>    to be unnecessarily opened when FETCHing mail headers that were
>>    already cached.
>> - mail attachment detection keywords not saved with maildir.
>> - dovecot.index.cache may have grown excessively large in some
>>    situations. This happened especially when using autoexpunging with
>>    lazy_expunge folders. Also with mdbox format in general the cache file
>>    wasn't recreated as often as it should have.
>> - Autoexpunged mails weren't immediately deleted from the disk. Instead,
>>    the deletion from disk happened the next time the folder was opened.
>>    This could have caused unnecessary delays if the opening was done by
>>    an interactive IMAP session.
>> - Dovecot's TCP connections sometimes add extra 40ms latency due to not
>>    enabling TCP_NODELAY. HTTP and SMTP/LMTP connections weren't
>>    affected, but everything else was. This delay wasn't always visible -
>>    only in some situations with some message/packet sizes.
>> - imapc: Fix various crash conditions
>> - Dovecot builds were not always reproducible.
>> - login-proxy: With shutdown_clients=no after config reload the
>>    existing connections could no longer be listed or kicked with doveadm.
>> - "doveadm proxy kick" with -f parameter caused a crash in some
>>    situations.
>> - Auth policy can cause segmentation fault crash during auth process
>>    shutdown if all auth requests have not been finished.
>> - Fix various minor bugs leading into incorrect behaviour in mailbox
>>    list index handling. These rarely caused noticeable problems.
>> - LDAP auth: Iteration accesses freed memory, possibly crashing
>>    auth-worker
>> - local_name { .. } filter in dovecot.conf does not correctly support
>>    multiple names and wildcards were matched incorrectly.
>> - replicator: dsync assert-crashes if it can't connect to remote TCP
>>    server.
>> - config: Memory leak in config process when ssl_dh setting wasn't
>>    set and there was no ssl-parameters.dat file.
>>    This caused config process to die once in a while
>>    with "out of memory".
>>
>> ---
>> Aki Tuomi
>> Open-Xchange oy
>>