From owner-freebsd-hackers@freebsd.org  Tue Feb 13 23:24:08 2018
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From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net>
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Subject: Re: rare gmake jobserver hangs, lost SIGCHLD?
In-Reply-To: <20180213221838.GA7424@britannica.bec.de>
To: Joerg Sonnenberger <joerg@bec.de>
Date: Tue, 13 Feb 2018 15:23:57 -0800 (PST)
CC: Don Lewis <truckman@freebsd.org>, freebsd-hackers@freebsd.org
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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.

And given you said Ryzen earlier there is also this issue just found
and fixed:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225584

> Joerg
-- 
Rod Grimes                                                 rgrimes@freebsd.org