From owner-freebsd-hackers@freebsd.org  Tue Feb 13 22:19:39 2018
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Date: Tue, 13 Feb 2018 23:18:38 +0100
From: Joerg Sonnenberger <joerg@bec.de>
To: Don Lewis <truckman@FreeBSD.org>
Cc: freebsd-hackers@freebsd.org
Subject: Re: rare gmake jobserver hangs, lost SIGCHLD?
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On Tue, Feb 13, 2018 at 10:46:32AM -0800, Don Lewis wrote:
> Starting in December 2016, I've seen three build runaway failures on
> different ports.

https://savannah.gnu.org/bugs/?49014 might be your problem.

Joerg