There was about 50-70 processes for every user with deinit at the end and in file:
Dec  9 16:53:10 host1 dovecot: imap-login: Error: read(imap) failed: Remote closed connection (destination service { process_limit } reached?)

Why there was about 50 dovecot imap processes per user with deinit status and what could have caused this ?

Resterting of dovecot proccess solved problem.

wt., 11 gru 2018 o 09:53 j.emerlik <j.emerlik@gmail.com> napisał(a):
What exactly means "deinit".

Yesterday I had all IMAP processes with word "deinit" in brackets and dovecot reached the limit of processes.
I had to do a restart of the process.

eg.:

dovecot   32482  0.0  0.0  24832  4256 ?        S    03:29   0:00 dovecot_host1/imap [pierrot xxx.xxx.xx.xx (deinit)]

Dovecot version 2.2.32.

Regards,
Jack