On Fri, Apr 03, 2020 at 10:24:28AM -0600, Theo de Raadt wrote: > I suspect your /etc/disktab file is broken.
Sadly that was not it, but someone else suggested that my /usr/obj was mounted "async" and, as it was mfs, that was true and there's a known bug (from November, so I guess more than a couple months) that with writing to a vnd on an async mount causing it. Replacing it with a disk mount means I can now build releases again! Hurray!
