dovecot: config: Error: BUG: Config client connection sent too much data

[Tony]

Hello,

Today I started noticing a very odd Dovecot error in the mail logs
across 2 replicated Dovecot hosts via dsync. I have searched the Dovecot
archives, Google, back tracked, downgraded Dovecot to earlier versions
from earlier this year and ruled everything out I could think of to no
avail. There really are not any helpful reports with what I am
specifically seeing. The strange thing is only vmail at domain.net is
repeatedly shown in the log. The error looks like this.

*Aug 24 22:46:02 orbitron dovecot: config: Error: BUG: Config client
connection sent too much data****Aug 24 22:46:02 orbitron dovecot:
doveadm(vmail at domain.net@domain.net at domain.net@domain.net at domain.net@domain.net at domain.net@domain.net at domain.net):
Fatal: Error reading configuration: read(/var/run/dovecot/config)
failed: read(size=8192) failed: Connection reset by peer***
$ dovecot --version
2.2.31 (65cde28) 

Dovecot #1: Linux kernel 4.9.36-x86_64
Dovecot #2: Linux kernel 4.12.8-x86_64

Here are the latest Dovecot updates performed this year.

[2017-04-29 14:45] [ALPM] upgraded dovecot (2.2.28-2 -> 2.2.28-3)
[2017-05-02 23:05] [ALPM] upgraded dovecot (2.2.28-3 -> 2.2.29.1-1)
[2017-06-11 17:20] [ALPM] upgraded dovecot (2.2.29.1-1 -> 2.2.30.2-1)
[2017-06-30 22:46] [ALPM] upgraded dovecot (2.2.30.2-1 -> 2.2.31-1)

When Dovecot was last updated back on June 30, I did `systemctl
daemon-reload` but never actually restarted the Dovecot daemon until
what seems like today. The only thing I did today was edit
/etc/dovecot/conf.d/10-auth.conf by simply enabling
"*auth_username_format = %Lu*" which was commented out before I enabled
it. That is the /*only*/ thing that I tested. After I was done testing I
went back and commented out the same thing so it reads
"*#auth_username_format = %Lu*" and of course restarted Dovecot. I
really doubt this has anything to do with what I am reporting as auth is
not the problem in this case.


Thank You,

Tony

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