Mateusz Krawczyk via Exim-users <exim-users@exim.org> (Mo 05 Mär 2018 08:32:13 
CET):
> Hello,
> 
> I'm running latest Centos 6 with exim 4.90.1. Recently I have noticed that
> some exim process in my system hangs on phase "handling TLS incoming
> connection" using 100% CPU for hours.
> 
> exiwhat
> 
> 41182 handling TLS incoming connection from s16.*** [91.*.*.*]
> 
> strace
> 
> read(7, "", 6049)                       = 0
> alarm(0)                                = 180
> alarm(180)                              = 0
> read(7, "", 6049)                       = 0
> alarm(0)                                = 180
> alarm(180)                              = 0

> 
> lrwx------ 1 root root 64 03-05 08:03 6 -> socket:[230019376]
> lrwx------ 1 root root 64 03-05 08:03 7 -> socket:[230019376]

> In /var/log/exim/mainlog
> 
> 2018-03-04 16:46:16 H=s16** [91.*.*.*]
> X=TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no F=<a...@example.com>
> rejected RCPT <w...@other.com>:
> (empty string after colon)
> ...

The verification message is missing. The rejection is probably due to
ACL verify recipient. Do you set a message there?

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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