Re: 8.2.2004 Latest yum update renders machine unbootable

[Stephen John Smoogen <smooge@xxxxxxxxx>]

On Sun, 2 Aug 2020 at 18:13, Robert G (Doc) Savage via CentOS
<centos@xxxxxxxxxx> wrote:
>
> -----Original Message-----
> From: Stephen John Smoogen <smooge@xxxxxxxxx>
> Reply-To: CentOS mailing list <centos@xxxxxxxxxx>
> To: CentOS mailing list <centos@xxxxxxxxxx>
> Subject: Re:  8.2.2004 Latest yum update renders machine unbootable
> Date: Sun, 2 Aug 2020 10:57:49 -0400
>
> On Sun, 2 Aug 2020 at 10:20, david <david@xxxxxxxx> wrote:
> > > <snip>
>
> I agree  it is a lot of shorthand because of expectations. In the endwe (the list) don't know what you have on your system or what state itis in. In order to get that information to help we would need you totry the following:
> 1. boot using a working USB/cdrom/netboot path and installer2. choose the rescue mode3. have the rescue mount the disks as local and chroot into thesystem. << if possible have the system also bring up networking >>
> Thenyum list kernel shim grub2 mokutil
> John,
>
>
> I have a CentOS 8.2.2004 system running on an EPYC-equipped SuperMicro motherboard. I assume it uses EFI boot. I have it set to auto-update with cron.daily, so it almost certainly has the buggy package(s) installed. I'm loath to try rebooting it just to see.
>

The buggy package is the shim package. If you don't have it on your
system then you should not be affected.

>
> When I run "yum list kernel shim grub2 mokutil" all I get back are the three installed kernel packages. Reverting to the old fashioned "rpm -qa | grep kernel-4 ; rpm -qa | grep shim ; rpm -qa | grep grub2 ; rpm -qa | grep mokutil" I get:
>
>
> kernel-4.18.0-147.8.1.el8_1.x86_64
> kernel-4.18.0-193.14.2.el8_2.x86_64
> kernel-4.18.0-193.6.3.el8_2.x86_64
> grub2-tools-2.02-87.el8_2.x86_64
> grub2-pc-2.02-87.el8_2.x86_64
> grub2-pc-modules-2.02-87.el8_2.noarch
> grub2-common-2.02-87.el8_2.noarch
> grub2-tools-efi-2.02-87.el8_2.x86_64
> grub2-tools-minimal-2.02-87.el8_2.x86_64
> grub2-tools-extra-2.02-87.el8_2.x86_64
>
>
> I apparently do not have either shim or mokutil packages installed. I'm not sure what this means. Am I not using EFI boot?
>
>

use the df command. If you are using EFI then it will report /boot/EFI
as a partition. If it doesn't then I would assume you are using BIOS.


> I have local copies of the earlier v2.02-81 grub2 packages. Would it be worthwhile to replace my v2.02-87 grub2 packages, then add this line to /etc/dnf/dnf.conf:
>
>
> exclude=grub shim mokutil
>
>
> as previously advised?
>

Since the problem is the shim package and you don't seem to have it..
I would say exclusion is not needed.

>
> Or should I just leave well enough alone and wait for tonight's auto-update to fix things?
>
>
> --Doc Savage
>     Fairview Heights, IL
>
>
>
>
>
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>
>
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-- 
Stephen J Smoogen.
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