dovecot - Oct 2019 - Dovecot and MySQL aborted connections.

Is anyone else using Dovecot (2.3.8) with MySQL (5.7) seeing a lot of 
these in MySQL logs?

2019-10-28T11:08:20.384428+02:00 58378 [Note] Aborted connection 58378 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading
communication packets)
2019-10-28T11:10:09.821171+02:00 58420 [Note] Aborted connection 58420 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading
communication packets)
2019-10-28T11:11:26.170015+02:00 58441 [Note] Aborted connection 58441 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading
communication packets)
2019-10-28T11:13:14.091426+02:00 58459 [Note] Aborted connection 58459 
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading
communication packets)

They've plagued my logs for as long as I can remember. Is Dovecot not 
closing connections to the database properly or something similar?

Reio

Hi,
> Is anyone else using Dovecot (2.3.8) with MySQL (5.7) seeing a lot of these
in MySQL logs?
> 
> 2019-10-28T11:08:20.384428+02:00 58378 [Note] Aborted connection 58378 to
db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
> 2019-10-28T11:10:09.821171+02:00 58420 [Note] Aborted connection 58420 to
db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
> 2019-10-28T11:11:26.170015+02:00 58441 [Note] Aborted connection 58441 to
db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
> 2019-10-28T11:13:14.091426+02:00 58459 [Note] Aborted connection 58459 to
db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
> 
> They've plagued my logs for as long as I can remember. Is Dovecot not
closing connections to the database properly or something similar?
is it possible MySQL closed inactive connections?

SHOW VARIABLES LIKE '%timeout%';

mysqlx_wait_timeout = 3600
wait_timeout = 3600
mysqlx_interactive_timeout = 3600
interactive_timeout = 3600

Gerald

On October 28, 2019 10:15:34 AM GMT+01:00, Reio Remma via dovecot <dovecot at
dovecot.org> wrote:
>Is anyone else using Dovecot (2.3.8) with MySQL (5.7) seeing a lot of 
>these in MySQL logs?
>
>2019-10-28T11:08:20.384428+02:00 58378 [Note] Aborted connection 58378 
>to db: 'vmail' user: 'vmail' host: 'localhost' (Got
an error reading
>communication packets)
>2019-10-28T11:10:09.821171+02:00 58420 [Note] Aborted connection 58420 
>to db: 'vmail' user: 'vmail' host: 'localhost' (Got
an error reading
>communication packets)
>2019-10-28T11:11:26.170015+02:00 58441 [Note] Aborted connection 58441 
>to db: 'vmail' user: 'vmail' host: 'localhost' (Got
an error reading
>communication packets)
>2019-10-28T11:13:14.091426+02:00 58459 [Note] Aborted connection 58459 
>to db: 'vmail' user: 'vmail' host: 'localhost' (Got
an error reading
>communication packets)
>
>They've plagued my logs for as long as I can remember. Is Dovecot not 
>closing connections to the database properly or something similar?
I'm seeing these messages too with mariadb on Debian 10.
>Reio
-- 
Christian Kivalo

On 28/10/2019 11:28, Gerald Galster via dovecot wrote:
> Hi,
>
>> Is anyone else using Dovecot (2.3.8) with MySQL (5.7) seeing a lot of
these in MySQL logs?
>>
>> 2019-10-28T11:08:20.384428+02:00 58378 [Note] Aborted connection 58378
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
>> 2019-10-28T11:10:09.821171+02:00 58420 [Note] Aborted connection 58420
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
>> 2019-10-28T11:11:26.170015+02:00 58441 [Note] Aborted connection 58441
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
>> 2019-10-28T11:13:14.091426+02:00 58459 [Note] Aborted connection 58459
to db: 'vmail' user: 'vmail' host: 'localhost' (Got an
error reading communication packets)
>>
>> They've plagued my logs for as long as I can remember. Is Dovecot
not closing connections to the database properly or something similar?
> is it possible MySQL closed inactive connections?
>
> SHOW VARIABLES LIKE '%timeout%';
>
> mysqlx_wait_timeout = 3600
> wait_timeout = 3600
> mysqlx_interactive_timeout = 3600
> interactive_timeout = 3600
>
> Gerald
Variable_name??? Value
connect_timeout??? 10
interactive_timeout??? 28800
lock_wait_timeout??? 31536000
net_read_timeout??? 30
net_write_timeout??? 60
wait_timeout??? 28800

That sounds plausible.? I wonder how to solve it though. :) I don't get 
any such notices from OpenSMPTD using the same database.