From owner-freebsd-hackers@freebsd.org  Tue Feb 13 23:21:07 2018
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Date: Tue, 13 Feb 2018 15:20:56 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: rare gmake jobserver hangs, lost SIGCHLD?
To: Joerg Sonnenberger <joerg@bec.de>
cc: freebsd-hackers@freebsd.org
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On 13 Feb, Joerg Sonnenberger wrote:
> 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.

Thanks!  That looks promising.