rebooting failure in testing-farm c10s

Example job https://github.com/bootc-dev/bootc/pull/1798/checks?check_run_id=56079749683 ➡️ https://artifacts.dev.testing-farm.io/f456b403-e87f-49dc-be80-7813f9de36ea/

We have an attempted workaround here https://github.com/bootc-dev/bootc/blob/f49a6bac30b2c224f6bac13fb5a68cd33b7fb74e/tmt/tests/booted/bootc_testlib.nu#L7

But this clearly needs root causing.

Is it failing in the ansible playbook which is doing the reboot? Maybe...I think it must be the inner test, but I don't see useful logs...