Upgrade 2.2.27 to 2.3.9.2: master(imap): net_connect_unix(imap) failed: Resource temporarily unavailable

[Eirik Rye]

On 08/01/2020 11:09, Aki Tuomi wrote:
> Can you enable 'verbose_proctitle=yes' and maybe compare with ss -tp output?

Thanks for the response!

What exactly did you want to compare? `ss -tp` does not appear to show 
cmdline/process title. I enabled it for one server, but will have to 
wait for users to reconnect and for the issue to reappear there.

In the meantime, on another server experiencing the same issue at this 
moment (same configuration), but no proctitles:

root at imap03:~# doveadm process status | grep "^imap " | wc -l
7564
root at imap03:~# ps aux | grep "dovecot/imap$" | wc -l
7570
root at imap03:~# ss -tp | grep '"imap-login"' | wc -l
8009
root at imap03:~# ss -tp | grep '"imap"' | wc -l
536
root at imap03:~# ss -nt "( sport = :143 or sport = :993 )" | wc -l
8739
root at imap03:~# doveadm who -1 | wc -l
7581

The `ss -tp` output appears normal (e.g. 8009+536 ~= 8739).

-- 
Eirik