Leapp preupgrade getting "Inhibitor: Detected loaded kernel drivers which have been removed in RHEL 8. Upgrade cannot proceed."

Environment

• Red Hat Enterprise Linux 7 (RHEL 7)
• Red Hat Enterprise Linux 8 (RHEL 8)
• Leapp Upgrade Tool

Issue

• Getting upgrade inhibitor when performing leapp preupgrade --target 8.x:

  Inhibitor: Detected loaded kernel drivers which have been removed in RHEL 8. Upgrade cannot proceed.
  

• As per /var/log/leapp/leapp-report.txt file:

  Risk Factor: high (inhibitor)
  Title: Detected loaded kernel drivers which have been removed in RHEL 8. Upgrade cannot proceed.
  Summary: Support for the following RHEL 7 device drivers has been removed in RHEL 8: 
   - floppy
   - pata_acpi
  

Resolution

Support for these device drivers has been removed in RHEL 8. Remove these drivers before proceeding with the upgrade:

$ sudo rmmod floppy pata_acpi

or

$ sudo modprobe -r floppy pata_acpi

Mostly, the Content from lore.kernel.org is not included.pata_acpi driver might not be in use even though the driver is loaded. However, if the hardware has a legacy PATA controller that works with the driver and drives attached to the controller, please consider migrating to modern hardware such as SATA or SCSI/SAS controllers.

Root Cause

• Support for a few device drivers has been removed in RHEL 8.
  Check the official documentation to see the list of removed drivers.
• pata_acpi driver which is provided by the installed kernel package will be loaded in RHEL7 when any IDE controller is connected even if the controller cannot be controlled by the driver since its alias is any IDE class storage.

Diagnostic Steps

• Verify the leapp report file /var/log/leapp/leapp-report.txt and check the risk factor message:

  Risk Factor: high (inhibitor)
  Title: Detected loaded kernel drivers which have been removed in RHEL 8. Upgrade cannot proceed.
  Summary: Support for the following RHEL 7 device drivers has been removed in RHEL 8: 
   - floppy
   - pata_acpi
  

• And check that the module is really not in use:

  $ lsmod | grep floppy
  floppy                 69432  0
  
  $ lsmod | grep pata_acpi
  pata_acpi              13053  0
  

$ lspci -nnvv
[...]
00:07.1 IDE interface [0101]: Intel Corporation 82371AB/EB/MB PIIX4 IDE [8086:7111] (rev 01) (prog-if 8a [ISA Compatibility mode controller, 
supports both channels switched to PCI native mode, supports bus mastering])
[...]
        Kernel driver in use: ata_piix
        Kernel modules: ata_piix, pata_acpi, ata_generic

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