Delayed flags changes over IDLE

[Kostya Vasilyev]

Timo,

On Wed, Mar 13, 2019, at 12:39 AM, Timo Sirainen wrote:
> On 12 Mar 2019, at 10.21, Kostya Vasilyev via dovecot <dovecot at dovecot.org> wrote:
>> 
>> It makes no difference if the IDLE connection does SELECT or SELECT (CONDSTORE) prior to going IDLE.
>> 
>> But then as far as I know (?) - in Dovecot, once any connection uses CONDSTORE ever, even once, Dovecot creates data structures to track MODSEQ values, and those data structures are forever.
> So are you saying that you can reproduce if you do for a completely new user:
> 
> doveadm exec imap -u testuser1
> a select inbox
> b idle
> 
> And then run:
> echo foo | doveadm save -u testuser1
> doveadm flags add -u testuser1 '\Seen' mailbox inbox 1
> 
> And the EXISTS shows up immediately after saving, but the flag change won't show up? It works fine with me.
> 
> Do you see any errors in "doveadm log errors"? Can you reproduce this if you try with some other mailbox format than mbox?
> 

1 - Yes I was able to reproduce with a completely new user.

I didn't use your doveadm commands above, but created a new Linux user in group mail, set a password in /etc/dovecot/users, and sent a few emails to that user from another mail account / web mail. My SMTP server is Postfix.

Then I used my IDLE client code (which does SELECT CONDSTORE) and a separate netcat connection to make flags changes.

Same thing as before: 1) no flags changes flushed to IDLE 2) until the other connection (which changed flags) does a SELECT.

The only difference from before - it was enough for netcat to do plain SELECT (i.e. SELECT CONDSTORE was not necessary).

I also tried a netcat connection instead of "my IDLE client" and did plain SELECT before going IDLE (i.e. SELECT without CONDSTORE). Same thing: 1) delay 2) flags changes are flushed after the other connection does SELECT.

2 - I switched to Maildir last night - and the problem stopped for same old existing user.

So it looks triggered by a combination of mbox + SELECT (CONDSTORE)?

3 - No errors in doveadm log errors

4 - /var/log/mail.err has this

Mar 13 09:21:17 kman dovecot: auth: Error: Master requested auth for nonexistent client 29548 (created 0 msecs ago, handshake 0 msecs ago)
Mar 13 09:21:18 kman dovecot: imap-login: Error: net_connect_unix(/var/run/dovecot/stats-writer) failed: No such file or directory

Probably means nothing - I tried to log in with IMAP before remembering to add my new user to /etc/dovecot/users

-- K
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