bin/50121: makemandb / man crashes on certain manual pages in netbsd-6

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>Number:         50121
>Category:       bin
>Synopsis:       makemandb / man crashes on certain manual pages in netbsd-6
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 03 15:30:00 +0000 2015
>Originator:     Havard Eidnes
>Release:        NetBSD 6.1_STABLE
>Organization:
	None
>Environment:
System: NetBSD smistad.uninett.no 6.1_STABLE NetBSD 6.1_STABLE (MAANEN) #1: Wed Oct 29 11:27:25 CET 2014 he%smistad.uninett.no@localhost:/usr/obj/sys/arch/i386/compile/MAANEN i386
Architecture: i386
Machine: i386
>Description:
	The makemandb program crashes on certain man pages.  In my
	case, the zabbix_agentd page from the pkgsrc-wip zabbix-agent
	package makes this happen (under the -v option):

Parsing: /usr/pkg/man/man8/zabbix_agentd.8
assertion "MAN_BLOCK == p->parent->type" failed: file "/usr/src/external/bsd/mdocml/lib/libmandoc/../../dist/man.c", line 212, function "man_node_append"
Abort (core dumped)

	The same happens if you do "man" on that manual page.
	However, if you do "nroff -man" on the manpage, it formats
	~ok.  The manpage doesn't use the new man page macros.

	This has the slightly nasty side effect that "man -k" on this
	machine is useless, as any lookup results in:

apropos: Unable to query schema version: disk I/O error

	(I thought that error code / message was reserved for actual
	hard IO failures, which this isn't an instance of.)


>How-To-Repeat:
	Install the pkgsrc-wip zabbix-agent package, watch either "man
	zabbix_agentd" or "makemandb -v" crash.

>Fix:
	There's quite a few updates to man/mkmandb in newer NetBSD
	code, but it appears to drag along also an update of mdocml
	and sqlite...

	However, with a wholesale upgrade to HEAD of all those 4
	components, makemandb no longer crashes, and "man
	zabbix_agentd" works as expected.
	Is this too invasive to contemplate pulling up to netbsd-6?
	Or does there exist a "point fix" for this problem?