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Date: Thu, 9 Aug 2018 22:16:12 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Ryan Stone <rysto32@gmail.com>
Cc: freebsd.ed.lists@sumeritec.com,
 FreeBSD Current <freebsd-current@freebsd.org>
Subject: Re: programs like gdb core dump
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On Thu, Aug 09, 2018 at 02:54:59PM -0400, Ryan Stone wrote:
> On Sat, Aug 4, 2018 at 9:17 PM Erich Dollansky
> <freebsd.ed.lists@sumeritec.com> wrote:
> >
> > Hi,
> >
> > I compiled me yesterday this system:
> >
> > 12.0-CURRENT FreeBSD 12.0-CURRENT #1 r337285:
> >
> > When restarting fortune core dumps. When trying to load the core dump,
> > gdb core dumps.
> >
> > The message is always:
> >
> > Bad system call (core dumped)
> >
> > Trying to install ports results in the same effect.
> >
> > Erich
> 
> Try "kldload sem"

We have kern.lognosys tunable/sysctl which allows to print the missed
syscall number to console and control terminal.