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The RHEL templates were inherited from RHEL8 instead of upstream so they are still using mkisofs to create the final iso. The actual tool is now xorriso which had maintained backwards compatability.

Upstream templates, including the generic ones shipped by lorax, are already using xorrisofs.

https://gitlab.com/redhat/centos-stream/rpms/lorax-templates-rhel/-/merge_requests/26

The changes are included in lorax-templates-rhel-9.0-27.el9, gating tests passed and also manual testing confirmed that xorrisofs was used and the created iso images are bootable. isoinfo doesn't show any difference between the currently built RHEL-9 boot.iso images and the image built using lorax-templates-rhel-9.0-27.el9.

lorax-templates-rhel-9.0-28.el9 is included in RHEL-9.0.0-20211107.7, moving to VERIFIED.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (new packages: lorax-templates-rhel), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:2364