Looks like 4.13 introduces a new incompatibility

[Bruno Wolff III]

On Mon, Jul 10, 2017 at 05:03:42 +0200,
  "Jason A. Donenfeld" <Jason at zx2c4.com> wrote:
>
>I need to annoy Ted Tso about this. It'll get merged for rc1 or rc2.

OK. I'll confirm when it builds again. I might try it out early if Tso 
has it in a public develoment tree before it gets to Linus' tree. This 
might show up other issues in things that build after cookie.o and so might 
be worthwhile even if building kernels from source is otherwise not usually 
worth the effort for me.