s390x/ZFCP: leapp fails in reboot phase when executing "zipl-switch-to-blscfg" command

Environment

• Red Hat Enterprise Linux 7
  • leapp
  • s390x (IBM Z)
  • ZFCP storage

Issue

• During reboot phase, leapp fails, printing the following message on the console and stopping at dracut prompt

  ... upgrade[1549]: ====> * zipl_convert_to_blscfg
  ... upgrade[1549]:         Convert the zipl boot loader configuration to the boot loader specification on s390x systems.
  ... systemd-coredump[2491]: Failed to connect to coredump service: No such file or directory
  ... upgrade[2421]: 2022-10-29 12:43:23.398 ERROR    PID: 835 leapp.workflow.Preparation.zipl_convert_to_blscfg: Could not call zipl-switch-to-blscfg command.
  ... upgrade[2421]: Traceback (most recent call last):
  ... upgrade[2421]:   File "/usr/share/leapp-repository/repositories/system_upgrade/el7toel8/actors/ziplconverttoblscfg/actor.py", line 54, in process
  ... upgrade[2421]:     raise OSError('Failed to convert the ZIPL configuration to BLS.')
  ... upgrade[2421]: OSError: Failed to convert the ZIPL configuration to BLS.
  ... upgrade[1549]: ====> * bind_update
  ... upgrade[1549]:         Actor parsing facts found in configuration and modifing configuration.
  ... upgrade[1549]: ============================================================
  ... upgrade[1549]:                            ERRORS
  ... upgrade[1549]: ============================================================
  ... upgrade[1549]: 2022-10-29 12:43:23.459724 [ERROR] Actor: zipl_convert_to_blscfg
  ... upgrade[1549]: Message: Failed to execute zipl-switch-to-blscfg.
  ... upgrade[1549]: Summary:
  ... upgrade[1549]:     Details: Failed to convert the ZIPL configuration to BLS.
  

Resolution

If you are already in reboot phase, reboot the system for it to load the RHEL7 kernel again.

Please open a case on the customer portal referencing this solution to request access to the hotfix leapp-repository-0.17.0-2.el7_9.

Root Cause

zipl-switch-to-blscfg executes in a container that doesn't have access to device nodes in /dev, causing the issue to occur.
The issue is tracked by This content is not included.BZ 2140563 - ZFCP systems fail to convert + issue with zipl-switch-to-blscfg [rhel-7.9.z].

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