>creating partition table with 2 partitions (20.0 MiB, 40.0 MiB)...
>Error: Partition(s) 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, >37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64 on /dev/vda have been written, but we have >been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should >reboot now before making further changes.
>Backtrace:
>           3 (primitive-load "/gnu/store/l9jgvnkl4ai2n461x3j1slx0fad…")
>In ./gnu/build/vm.scm:
>   470:21  2 (initialize-hard-disk "/dev/vda" #:bootloader-package _ …)
>    300:2  1 (initialize-partition-table "/dev/vda" (#<<partitio…> …) …)
>In ./guix/build/utils.scm:
>   654:6  0 (invoke _ . _)

>      program: "parted"
>      arguments: ("--script" "/dev/vda" "mklabel" "msdos" "mkpart" "primary" "ext2" "1048576B" "22020096B" "set" "1" "boot" "on" "mkpart" "primary" "ext2" "22020608B" "63963648B" "set" "2" "esp" "on")

I see.

That's the same thing that makes all the system tests fail (see bug 43344).

I don't know why.

I've already tried to invoke wipefs -a before that parted invocation--it didn't
help.