shutting down computer causes WindowMaker coredump

[Anatoly]

On Mon, 20 Feb 2017 22:20:59 +0100 (CET)
Marco Beishuizen <mbeis at xs4all.nl> wrote:

> Hi,
> 
> I just discovered a really strange issue with my machine running
> FreeBSD 11/amd64.
> 
> Sometimes WM coredumps when shutting down the computer from an xterm, 
> using "shutdown -p now" (after closing all running programs). This is
> a small problem by itself, but the strange thing is that this *only*
> happens after I have upgraded firefox from ports. E.g today FF had a
> small update, I upgraded FF this afternoon and this evening when
> shutting down, WM coredumps.
> 
> Right now I can't see the relationship between WM, FF, shutting down
> and what can cause this.
> 
> Has anyone seen something like this before?
> 
> Regards,
> Marco

I have this issue since end of october (approximately), just when I
fresh installed FreeBSD 10.2 and updated to latest pathclevel (at the
moment) with freebsd-update and updated ports also. Then I've installed
xorg xorg-7.7_2 from packages and fluxbox fluxbox-1.3.7_1 from ports. As
I can recall it, I faced this issue before installing Firefox. That
machine has H61 chiset based motherboard and Pentium G2030 CPU with
integrated graphics, which xorg intel driver detects as Intel(R) HD
Graphics 2500. Also, I've tried older version of fluxbox (didn't
remember which yet) from sources with no success.