bin/53764: named dumps core when exiting

[martin%NetBSD.org@localhost]

>Number:         53764
>Category:       bin
>Synopsis:       named dumps core when exiting
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Dec 06 09:15:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.26
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD unpluged.duskware.de 8.99.26 NetBSD 8.99.26 (UNPLUGED) #213: Wed Dec 5 12:28:43 CET 2018 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/evbarm/compile/UNPLUGED evbarm
Architecture: earm
Machine: evbarm
>Description:

When rebooting this machine (like with: shutdown -r now) named seems to dump
core shortly before the system unmounts all file systems.

I can not reproduce it with /etc/rc.d/named stop - so maybe it only happens
"sometimes".

Unfortunately the core file produced is unusable (separate PR), so diagnostic
is a bit tricky. There is nothing in syslog.

>How-To-Repeat:
n/a

>Fix:
n/a