bug#53541: backtrace during fresh Guix System install during formatting

[bdju]

On Tue Jan 25, 2022 at 9:21 PM CST, bdju via Bug reports for GNU Guix wrote:
> Using a "latest" installer image from the last day or two
> Picture of error taken with my phone attached (eh, what can ya do?)
>
> >Device /dev/sdc is still in use.
>
> This sticks out and appears in a couple spots.
if I don't view the details of /boot it tells me it can't read
/dev/sda1 and to format it, then if I select it, it
becomes ext4 by default and format is set to no

Should the boot partition be fat32, ext4, or could it even be btrfs? I'm
doing an encrypted install and I want btrfs for the root partition.