Comment 8 for bug 1602299

This looks relevant:

  https://www.redhat.com/archives/dm-devel/2016-June/msg00015.html

On Tue, Jul 19, 2016 at 5:19 AM, Stefan Bader <email address hidden>
wrote:

> While I have not found out where exactly things go wrong, I could
> confirm that this is related to ppc64el builds using a 64k page size. I
> build a test kernel with 4k page size and installed it inside the VM.
> With that bcache-super-show will will reflect the correct status after
> activation and also the superblock magic will remain intact when
> breaking the cache and backing device.
>
> --
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> report.
> https://bugs.launchpad.net/bugs/1602299
>
> Title:
> bcache is unstable on ppc64el
>
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