i386 top reporting nan% or inf% WCPU

Tue Jul 24 17:44:17 UTC 2018

I recently merged my work in progress tree up to r336665 and built a
i386 VM image. Running the image in QEMU (qemu-system-x86_64) and
executing 'top' I see the WCPU column reported as either nan% or inf%
for all processes.

Prior to today I hadn't built or tested i386 in a while, so I am not
sure off hand if this is a recent issue. amd64 is fine. Is anyone else
seeing this?