On Wed, Jan 14, 2015 at 9:24 AM, Bart Van Assche <bvanassche@acm.org> wrote:

However, this caused the
build server to install the kernel-debug-devel RPM instead of the
kernel-devel RPM (see also
https://cbs.centos.org/koji/taskinfo?taskID=6041 for the logs).

I've encountered the same problem with the openafs-kmod package.  The only solution I've found was to have a 

BuildRequires: kernel-devel = %{kver}

... because the kernel-debug-devel provides "kernel-devel = 3.10.0-123.13.2.el7.debug"

This is why it finds it when you don't specify the kversion.  Red Hat, in their infinite wisdom, made the kernel-debug-devel provide kernel-devel, and the RPM sorting algorithm finds that "3.10.0-123.13.2.el7.debug" is a later version-release than "3.10.0-123.13.2.el7".