With this fix,

GOMAXPROCS=8 ./all.bash

passes, at least on my machine.

Fixes #10216.

Change-Id: Ib5991950892a1399ec81aced0a52b435e6f83fdf
Reviewed-on: https://go-review.googlesource.com/9392Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>