Aki Tuomi <aki.tu...@dovecot.fi> wrote:

On 06.06.2017 14:11, Olaf Hopp wrote:
On 06/05/2017 11:05 AM, Angel L. Mateo wrote:
     I have updated my dovecot proxy servers from 2.2.28 to 2.2.30.
Since the upgrade I'm having the error:

Jun  5 10:54:51 musio12 dovecot: auth: Fatal: master: service(auth):
child 63632 killed with signal 11 (core not dumped)

+1.

We have identified a bug in auth process, and are working with a fix.

This is the 1 line context around the same thing I am seeing, if it helps.
It seems to happen with brute force scanning

        Jun  6 06:13:30 server dovecot: imap-login: Warning: Auth connection 
closed with 1 pending requests (max 7 secs, pid=20675
        , EOF)
        Jun  6 06:13:30 server dovecot: auth: Fatal: master: service(auth): 
child 20676 killed with signal 11 (core not dumped - set service auth { 
drop_priv_before_exec=yes })
        Jun  6 06:13:30 server dovecot: imap-login: Disconnected (auth failed, 1 attempts 
in 7 secs): user=<{dead@account}>, method=PLAIN, rip=5.188.11.11, lip={my-ip}, TLS, 
session=<EpJbYkpRInsFvAsL>

Bots aren't known to exit cleanly, so it's probably related to prematurely
dropped connections.  Apart from that, I'm not seeing this with real
users.

Joseph Tam <jtam.h...@gmail.com>

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