Etcd and kubernetes have hit this.
See  https://bugzilla.redhat.com/show_bug.cgi?id=1248071

Change-Id: I6231013efa0a19ee74f7ebacd1024adb368af83a
Reviewed-on: https://go-review.googlesource.com/12951Reviewed-by: Ian Lance Taylor <iant@golang.org>