kern/51664: slhci(4) does not handle NAKs properly

[flxd%NetBSD.org@localhost]

>Number:         51664
>Category:       kern
>Synopsis:       slhci(4) does not handle NAKs properly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 27 09:10:00 +0000 2016
>Originator:     Felix Deichmann
>Release:        7.99.42
>Organization:
>Environment:
NetBSD 7.99.42 alpha
>Description:
slhci(4) does not handle NAKs properly, seen especially when trying to use axe(4) at slhci: It will attach, but ifconfig(8) hangs when trying to bring up the interface.
>How-To-Repeat:
Use axe(4) at slhci(4).
>Fix: