[Bug 1788775] [NEW] updating grub can end up with loopback devices in grub.cfg

[Michael Hudson-Doyle]

Public bug reported:

I had (I think, I can't quite remember) the filesystem.squashfs from a
live server ISO mounted when the kernel was updated. A menu entry for
this OS-resembling device is now in my grub.cfg:

menuentry 'Ubuntu 18.04.1 LTS (18.04) (on /dev/loop35p1)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-cf05f674-791e-48eb-9b42-1bb903f4d024' {
        insmod part_msdos
        insmod ext2
        if [ x$feature_platform_search_hint = xy ]; then
          search --no-floppy --fs-uuid --set=root  cf05f674-791e-48eb-9b42-1bb903f4d024
        else
          search --no-floppy --fs-uuid --set=root cf05f674-791e-48eb-9b42-1bb903f4d024
        fi
        linux /boot/vmlinuz-4.15.0-29-generic root=UUID=cf05f674-791e-48eb-9b42-1bb903f4d024 ro
        initrd /boot/initrd.img-4.15.0-29-generic
}

I didn't select it :)

Something in this setup should be skipping loopback devices, surely?

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1788775

Title:
  updating grub can end up with loopback devices in grub.cfg

Status in grub2 package in Ubuntu:
  New

Bug description:
  I had (I think, I can't quite remember) the filesystem.squashfs from a
  live server ISO mounted when the kernel was updated. A menu entry for
  this OS-resembling device is now in my grub.cfg:

  menuentry 'Ubuntu 18.04.1 LTS (18.04) (on /dev/loop35p1)' --class ubuntu --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-cf05f674-791e-48eb-9b42-1bb903f4d024' {
          insmod part_msdos
          insmod ext2
          if [ x$feature_platform_search_hint = xy ]; then
            search --no-floppy --fs-uuid --set=root  cf05f674-791e-48eb-9b42-1bb903f4d024
          else
            search --no-floppy --fs-uuid --set=root cf05f674-791e-48eb-9b42-1bb903f4d024
          fi
          linux /boot/vmlinuz-4.15.0-29-generic root=UUID=cf05f674-791e-48eb-9b42-1bb903f4d024 ro
          initrd /boot/initrd.img-4.15.0-29-generic
  }

  I didn't select it :)

  Something in this setup should be skipping loopback devices, surely?

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