ReaR rescue image is not bootable

Solution Verified - Updated -

Issue

  • ReaR rescue image is not bootable from UEFI firmware.

  • Upon inspecting the contents of the ISO, the efiboot.img file—which acts as the EFI System Partition(ESP) is found to be empty.

    [root@localhost ~]# mount -o loop,ro rear-localhost.iso /mnt/1
[root@localhost ~]# mount /mnt/1/boot/efiboot.img /mnt/2
[root@localhost ~]# find /mnt/2
/mnt/2

(Expected)
[root@localhost ~]# mount /mnt/3/boot/efiboot.img /mnt/4
[root@localhost ~]# find /mnt/4
/mnt/4
/mnt/4/EFI
/mnt/4/EFI/BOOT
/mnt/4/EFI/BOOT/BOOTX64.efi
/mnt/4/EFI/BOOT/grub.cfg
/mnt/4/EFI/BOOT/fonts
/mnt/4/EFI/BOOT/locale
:

  • rear mkbackup outputs "umount: /tmp/rear.gwFJBM9ela7W7fz/tmp/efi_virt: target is busy.".

Environment

  • Red Hat Enterprise Linux 7, 8 and 9
  • UEFI
  • Third party security software installed (Kaspersky Endpoint Antivirus, Symantec Data Center Security, Microsoft Defender, etc)
  • Or, systems with high CPU counts and large memory capacities

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