Re: Question about grub rebooting on cloned disk

[Pascal Hambourg]

On 22/01/2025 at 17:01, Mitchell Augustin wrote:
> A partner has observed some behavior where a disk that has been cloned
> from another disk will take an extra reboot compared to the original
> disk, seemingly triggered during execution of the grub binary. After
> this extra reboot, the boot continues normally.
>
> Generally speaking, is there some process within grub for which this
> is the expected behavior? My assumption is that this may be due to
> something like a mismatched UUID between the two disks triggering some
> autocorrection mechanism, but this is just an educated guess, and I am
> not seeing anything in the grub source like this at a quick glance.

AFAIK, GRUB does not do this.
How was the disk cloned ?
Does it happen at every boot or only the first one ?
On the original machine or a different one ?
If this happens only the first time with EFI boot, it could be shim 
fall-back.