What were you trying to do that didn't work?

Trying to install a system with RHEL9 and UEFI, which has its disks as a DDF container, the RPM scriptlet of grub2-common fails in error, causing the installation to fail:

Error in POSTTRANS scriptlet in rpm package grub2-common

After much investigation, the root cause is grub2-probe executing in the RPM scriptlet fails in error because it's not capable of detecting the DDF volume:

# grub2-probe --target=fs_uuid /boot
grub2-probe: error: ../grub-core/kern/disk.c:236:disk `mduuid/ae5ff76c9b96633df9ac83931903c2a9,1' not found.

A workaround is to create /boot/grub2/device.map with mapping below:

(hd0)     /dev/md126p2

But such mapping cannot be created without much hacking during the installation phase, hence tagging this JIRA as Major.

Please provide the package NVR for which bug is seen:

grub2-tools-minimal-2.06-80.el9_4.x86_64

How reproducible:

Always

Steps to reproduce (minimal reproducer)

1. On a QEMU/KVM system, add 2 additional disks that will be used as a DDF Raid
2. Create a DDF Raid on the disks, format it and mount it

   # yum -y install mdadm
   # mdadm --create /dev/md/ddf --name=ddf --level container --raid-disks=2 --metadata=ddf /dev/vdb /dev/vdc
   # mdadm --create /dev/md/Volume0 --name=Volume0 --level raid1 --raid-disks=2 /dev/md/ddf
   # mkfs.xfs /dev/md/Volume0
   # mount /dev/md/Volume0 /mnt

3. Execute grub2-probe

   # grub2-probe --target=fs_uuid /mnt

Expected results

Some UUID being returned

Actual results

grub2-probe: error: ../grub-core/kern/disk.c:236:disk `mduuid/ae5ff76c9b96633df9ac83931903c2a9' not found.