[CentOS] 8.2.2004 Latest yum update renders machine unbootable

Sun Aug 2 12:33:59 UTC 2020
Johnny Hughes <johnny at centos.org>

On 8/2/20 6:59 AM, Johnny Hughes wrote:
> On 8/2/20 2:04 AM, Alessandro Baggi wrote:
>> Il 01/08/20 22:03, Greg Bailey ha scritto:
>>> On 8/1/20 6:56 AM, david wrote:
>>>> At 02:54 AM 8/1/2020, Alessandro Baggi wrote:
>>>>> Hi Johnny,
>>>>> thank you very much for clarification.
>>>>> You said that in the centos infrastructure only one server got the
>>>>> problem.
>>>>> What are the conditions that permit the breakage? There is a particular
>>>>> configuration (hw/sw) case that match always the problem or it is
>>>>> random?
>>>>> Thank you
>>>> I have two servers running Centos 7 on apple hardware (one mac-mini
>>>> and one mac server).  They both failed to reboot a few days ago.  So
>>>> perhaps whatever anti-boot bug hit Centos 8, also hit Centos 7.  I
>>>> can't tell what version got updated since the system simply fails to
>>>> boot.  I don't even get a grub screen. I'll have to rebuild the
>>>> systems from scratch.
>>> You should be able to boot off of installation media into rescue mode,
>>> and downgrade the grub2* and/or shim* RPMs.
>>> -Greg
>> I did the downgrade on a fresh install of c8.2 but yum said that all
>> selected packages (grub2,shim...) are already to the lowest version and
>> the downgrade is not possibile, ending with "nothing to do".
> Ok .. We are running through some final testing now for CentOS Linux 8
> and CentOS Stream .. updates later today for EL8.
> For CentOS Linux 7 .. I just pushed the latest shim packages (we had to
> get these signed by Microsoft .. as do all distros that do shim.
> Microsoft is the official CA for secureboot.
> So in the next few hours, after the mirrors sync up .. you should be
> able to fix any EL7 machines.
> I'll post here again once we have pushed the EL8 and CentOS Stream updates.

OK .. I have also now pushed the CentOS Linux 8 update .. you should see
an update to SHIM .. the new versions are:


For CentOS Linux 7 .. the new files are:


You need only replace the files you currently have installed, not
install every file.

Please report both positive and negative results.

Johnny Hughes

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