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Date: Sun, 21 Jan 2018 16:52:36 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: Ryzen issues on FreeBSD ?
To: Peter Moody <freebsd@hda3.com>
cc: Nimrod Levy <nimrodl@gmail.com>, freebsd-stable@freebsd.org,
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On 21 Jan, Peter Moody wrote:
> hm, so i've got nearly 3 days of uptime with smt disabled.
> unfortunately this means that my otherwise '12' cores is actually only
> '6'. I'm also getting occasional segfaults compiling go programs.

Both my original and replacement CPUs croak on go, so I don't think an
RMA is likely to help with that.  Go is a heavy user of threads and my
suspicion is that there is some sort of issue with the locking that is
uses. I'm guessing a memory barrier issue of some sort ...