fedora-minimal trying to boot from loop device

In upstream infra

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nodepool@nodepool:~$ openstack --os-cloud osic-cloud1 console log show 0ed1cf5d-9cc6-4793-aa8f-bce3521ca89d
[H[J[1;1H[?25l[m[H[J[1;1H[20;7H[mUse the ^ and v keys to change the selection.
      Press 'e' to edit the selected item, or 'c' for a command prompt. [4;80H [7m[4;1H Fedora 24 (Twenty Four) [m[4;79H[m[m[5;1H Advanced options
 for Fedora 24 (Twenty Four) [m[5;79H[m[m[6;1H Ubuntu 14.04.5 LTS (14.04) (on /dev/loop4p1) [m[6;79H[m[m[7;1H Advanced options for Ubuntu 14.
04.5 LTS (14.04) (on /dev/loop4p1) [m[7;79H[m[m[8;1H Ubuntu 14.04.5 LTS (14.04) (on /dev/loop5p1) [m[8;79H[m[m[9;1H Advanced options for Ubuntu 14.04.5 LTS (14.04
) (on /dev/loop5p1) [m[9;79H[m[m[10;1H [m[10;79H[m[m[11;1H
               [m[11;79H[m[m[12;1H [m[12;79H[m[m[13;1H
    [m[13;79H[m[m[14;1H [m[14;79H[m[m[15;1H [m[15;7
9H[m[m[16;1H [m[16;79H[m[m[17;1H [m[17;79H[m[m[18;1
H [m[18;79H[m[18;80H [4;79H[22;1H The selected entry will be started automatically in 5s. [4;79H[22;1H The selected entry will be started automatically in 4s. [4;79H[22;1H The selected entry will be started automatically in 3s. [4;79H[22;1H The selected entry will be started automatically in 2s. [4;79H[22;1H The selected entry will be started automatically in 1s. [4;79H[22;1H The selected entry will be started automatically in 0s. [4;79H[?25h[H[J[1;1H[H[J[1;1H[ 0.000000] Linux version 4.8.8-200.fc24.x86_64 (<email address hidden>) (gcc version 6.2.1 20160916 (Red Hat 6.2.1-2) (GCC) ) #1 SMP Tue Nov 15 19:41:51 UTC 2016
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.8.8-200.fc24.x86_64 root=/dev/loop7p1 ro nofb nomodeset vga=normal console=tty0 console=ttyS0,115200 no_timer_check
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Something is really wrong here. It's got Ubuntu kernels in the grub config and all during the build in the infra "99-fix-grub-timeout" element

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2016-11-21 01:19:59,245 INFO nodepool.image.build.fedora-24: dib-run-parts Mon Nov 21 01:19:59 UTC 2016 Running /tmp/in_target.d/finalise.d/99-fix-grub-timeout
2016-11-21 01:19:59,267 INFO nodepool.image.build.fedora-24: + set -e
2016-11-21 01:19:59,268 INFO nodepool.image.build.fedora-24: + '[' -f /etc/default/grub ']'
2016-11-21 01:19:59,268 INFO nodepool.image.build.fedora-24: + sed -i -e 's/^GRUB_TIMEOUT=[0-9]\+/GRUB_TIMEOUT=0/' /etc/default/grub
2016-11-21 01:19:59,352 INFO nodepool.image.build.fedora-24: + which update-grub
2016-11-21 01:19:59,353 INFO nodepool.image.build.fedora-24: + [[ fedora == gentoo ]]
2016-11-21 01:19:59,353 INFO nodepool.image.build.fedora-24: + GRUB_CFG=/boot/grub2/grub.cfg
2016-11-21 01:19:59,353 INFO nodepool.image.build.fedora-24: + /usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg
2016-11-21 01:20:00,082 INFO nodepool.image.build.fedora-24: Generating grub configuration file ...
2016-11-21 01:20:00,226 INFO nodepool.image.build.fedora-24: Found linux image: /boot/vmlinuz-4.8.8-200.fc24.x86_64
2016-11-21 01:20:03,287 INFO nodepool.image.build.fedora-24: Found Ubuntu 14.04.5 LTS (14.04) on /dev/loop4p1
2016-11-21 01:20:04,942 INFO nodepool.image.build.fedora-24: Found Ubuntu 14.04.5 LTS (14.04) on /dev/loop5p1
2016-11-21 01:20:06,465 INFO nodepool.image.build.fedora-24: done
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The kernel oops on boot as it can't mount root