Bug#1051271: GRUB2 2.12~rc1-7 prevent machine to boot

[Agustin Martin]

El mar, 5 sept 2023 a las 17:21, Agustin Martin
(<agmartin at debian.org>) escribió:
>
> On Tue, Sep 05, 2023 at 04:19:01PM +0200, Miguel A. Vallejo wrote:
> > Package: grub2
> > Version: 2.12~rc1-7
> > Severity: critical
> >
> > This morning I noticed an apt upgrade in Debian unstable/Sid upgraded
> > grub-common, grub2-common, grub-efi-amd64 and grub-efi-amd64-bin. The
> > upgrade went normally and no errors were shown. Then I turned the
> > computer off and after a few hours I tried to turn it on, but it
> > didn't boot, it tried to boot but finally showed the bios screen.
> >
> > After booting with a live USB and chroot into the hard drive, I
> > downgraded those four packages to version 2.06-3~deb11u5, and after
> > run install-grub, the computer booted normally.
> >
> > Anyone can confirm problems with version 2.12~rc1-7 and UEFI machines?
>
> Same problem here.

I can confirm that downgrading all above grub packages to 2.06-13,
reinstalling grub and updating grub.cfg works around this issue.

Did all together, only part of the above might be required. Previously
tried to change grub.cfg to an old version to check if I could reach
the grub menu, but no luck.

diffing old (the one generated by buggy grub) and new grub.cfg created
after downgrading I see a dis_ucode_ldr parameter as well as an 'UEFI
Firmware Settings' entry in old grub.cfg.

Hope this helps

-- 
Agustin