Dovecot release v2.3.7

Eirik Rye rye at
Tue Jul 16 14:11:31 EEST 2019

Please disregard this. My apologies.

The issue appears to have been caused by an unrelated network issue with 
one of the directors, that coincidentally occurred at almost the exact 
same time.

A potential improvement would be if the "Ring SYNC seq=XX appears to 
have got lost" error message would indicate which director/server it 
pertains to.

Best 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
>> Binary packages are available at
>> Changes
>> -------
>> * fts-solr: Removed break-imap-search parameter
>> + Added more events for the new statistics, see
>> + mail-lua: Add IMAP metadata accessors, see
>> + Add event exporters that allow exporting raw events to log files and
>>    external systems, see
>> + 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

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