On Sun, 27 Aug 2023 10:53:48 +1000 Stephen Morris samorris@netspace.net.au wrote:
Caveat: I don't have any knowledge about the tpm and grub2 interaction.
Can anyone suggest what I need to look at to try to determine why this error is occurring?
It sounds like a bug. I think the messages are being generated because when the system tries to mount the restarted partition, it is already mounted because of the restart, and so you get both errors. The inability to mount the already mounted partition triggers the unknown error. How you would debug this is problematic, but it is a theory to consider at least. Why it would suddenly start happening is another question. What were the updates immediately before this started happening? Look in var/log/dnf.rpm.log. If you find a likely culprit, try downgrading it, or, if that doesn't work, go to koji and download an older version and downgrade it locally. https://koji.fedoraproject.org/koji/packages dnf -C downgrade [downloaded package name]
Finally, have you actually had a successful warm restart since the firmware update? That is, can you really cross the firmware update off the list of possibilities?