auth core dump

[Mamontov Roman]

> Op 10/01/2019 om 14:43 schreef Mamontov Roman:
[...]
> Thanks for reporting this. We're looking into it.
> Tracking internally as DOP-867.

Sorry for late answer: I found where problem: dovecot been compiled
on  11-Stable  branch  with  ports OpenSSL. After upgrade to 12-Stable
(which  have  base  OpenSSL  1.1.1)  dovecot (and some other software,
which  use OpenSSL library, but not all) hangs when user connected via
SSL'ed  imap  with  core  dumps.  When  I  removed  ports  OpenSSL and
recompile dovecot with base OpenSSL 1.1.1 it stopped hangs.