rare gmake jobserver hangs, lost SIGCHLD?

[Rodney W. Grimes]

> 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 at freebsd.org