Hi,

On Wed, 18 Nov 2020 09:00:34 +0300
Oleg Pykhalov <go.wigust@gmail.com> wrote:

> According to Git bisect, the 977eb5d0 commit breaks docker-service-type
> with the following error during “guix system build” or “guix system
> reconfigure”:
> 
>     guix system: error: service 'dockerd' requires 'file-system-/sys/fs/cgroup/blkio', which is not provided by any service

I can confirm this bug.

However, I cannot say one way or another where the patch is the right fix.