bin/53748: ssh/sshd unusable on i386/current

[martin%NetBSD.org@localhost]

>Number:         53748
>Category:       bin
>Synopsis:       ssh/sshd unusable on i386/current
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 27 19:20:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.25
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-porter.duskware.de 8.99.25 NetBSD 8.99.25 (PORTER) #7: Thu Nov 8 10:00:36 CET 2018 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/i386/compile/PORTER i386
Architecture: i386
Machine: i386
>Description:

Since (I believe) the last openssl update, sshd and ssh on this
machine are unusable. Sshd becomes unresponsive, it takes ages
to log in or attempts time out. Once loged in, everything works
fine for that session.
Suspecting broken BN lib code for the KEX phase.

My cpu is old, but not exactly that slow (even my mac68k can do ssh
sessions, even if initial log in takes 70s, but that is on a 40 MHz
machine, not a GHZ one)

CPU on this i386:

cpu0 at mainbus0 apid 0
cpu0: Intel(R) Pentium(R) 4 CPU 2.60GHz, id 0xf29
cpu0: package 0, core 0, smt 0
cpu1 at mainbus0 apid 1
cpu1: Intel(R) Pentium(R) 4 CPU 2.60GHz, id 0xf29
cpu1: package 0, core 0, smt 1


>How-To-Repeat:
run -current, try to ssh in ?
Can anyoe reproduce it or is there some other failure specific to my
machine?

>Fix:
n/a