I tried to find out how much time we need to render a manual page, and looked for the largest manpage. I found in the ports collection the salt(7) manpage from the saltstack (https://saltstack.com/)
When I run the man command I noticed that groff crashes with signal 6.
How to repeat:
$ fetch https://www.freebsd.org/~wosch/tmp/salt.7.gz
$ zcat salt.7.gz | groff >/dev/null; echo $?
<standard input>:860: warning: can't find character with input code 153
<standard input>:3504: warning [p 22, 5.8i]: can't break line
troff: Failed assertion at line 510, file `/usr/src/gnu/usr.bin/groff/src/roff/troff/../../../../../../contrib/groff/src/roff/troff/input.cpp'.
groff: troff: Signal 6 (core dumped)
grops:<standard input>:1960401:warning: no final `x stop' command
$ groff --version
GNU groff version 1.19.2
Which FreeBSD version? The 'Version' field is set to CURRENT, but troff is not included in the base system in CURRENT.
(In reply to Ed Maste from comment #1)
FreeBSD 12.0-CURRENT from Nov 17 2017 (upgraded from FreeBSD 11.1-STABLE a week ago).
I see the problem also on FreeBSD 11.1-STABLE
Recent 12-CURRENT does not provide /usr/bin/troff - perhaps you did not run make delete-old after the upgrade from 11?
(In reply to Ed Maste from comment #3)
You are right - I forgot to run 'make delete-old'. I assumed this is part of 'make installworld'. My bad, sorry.