[CentOS] 8.2.2004 Latest yum update renders machine unbootable

Sun Aug 2 13:56:35 UTC 2020
Johnny Hughes <johnny at centos.org>

On 8/2/20 8:47 AM, david wrote:
> At 06:37 AM 8/2/2020, Johnny Hughes wrote:
>> On 8/2/20 8:30 AM, david wrote:
>> > At 06:10 AM 8/2/2020, you wrote:
>> >> On 8/2/20 8:04 AM, david wrote:
>> >> >
>> >> >> <snip>
>> >> >
>> >> >
>> >> >
>> >> >> > 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:
>> >> >>
>> >> >> PowerTools/x86_64/os/Packages/shim-unsigned-x64-15-8.el8.x86_64.rpm
>> >> >> BaseOS/x86_64/os/Packages/shim-ia32-15-15.el8_2.x86_64.rpm
>> >> >> BaseOS/x86_64/os/Packages/shim-x64-15-15.el8_2.x86_64.rpm
>> >> >>
>> >> >> For CentOS Linux 7 .. the new files are:
>> >> >>
>> >> >> x86_64/Packages/mokutil-15-8.el7.x86_64.rpm
>> >> >> x86_64/Packages/shim-ia32-15-8.el7.x86_64.rpm
>> >> >> x86_64/Packages/shim-unsigned-ia32-15-8.el7.x86_64.rpm
>> >> >> x86_64/Packages/shim-unsigned-x64-15-8.el7.x86_64.rpm
>> >> >> x86_64/Packages/shim-x64-15-8.el7.x86_64.rpm
>> >> >>
>> >> >> You need only replace the files you currently have installed, not
>> >> >> install every file.
>> >> >>
>> >> >> Please report both positive and negative results.
>> >> >>
>> >> >> Thanks,
>> >> >> Johnny Hughes
>> >> >>
>> >> > I updated my Centos 7, and it's awaiting a reboot.  The
>> version of
>> >> shim
>> >> > says 15-7, which I presume is the bad one.
>> >> >
>> >> > What do I need to do?  Obviously, a reboot will encounter the
>> >> failure.Â
>> >> > Or, should I perform "yum update" periodically and wait for shim
>> >> 15-8 to
>> >> > appear, and only after that do the reboot?  Or is there some
>> other
>> >> remedy?
>> >> >
>> >> > And by the way, I'm amazed at the speed with which this problem was
>> >> > addressed and a fix provided.  You guys work wonders.
>> >> >
>> >> > David
>> >>
>> >> It would be best IF the kernel and shim get installed at the same time
>> >> if possible .. so I would install the kernel again (since it is not
>> >> running yet) with the new shim.
>> >>
>> >> BTW .. it does not fail on every install .. so it might work w/o
>> the new
>> >> update.  However, no need to chance it at this point.  Wait until
>> the
>> >> new shim is there and install it and reinstall the kernel is my
>> advise.
>> >
>> > Here's what I get...
>> >
>> > rpm -qa | grep shim
>> > shim-x64-15-7.el7_9.x86_64
>> >
>> > yum update
>> > Loaded plugins: fastestmirror, langpacks, priorities
>> > Loading mirror speeds from cached hostfile
>> > Â * base: mirror.fileplanet.com
>> > Â * epel: mirror.prgmr.com
>> > Â * extras: mirror.shastacoe.net
>> > Â * remi-php73: mirror.sjc02.svwh.net
>> > Â * remi-safe: mirror.sjc02.svwh.net
>> > Â * updates: centos-distro.1gservers.com
>> > 373 packages excluded due to repository priority protections
>> > No packages marked for update
>> >
>> >
>> >
>> > Should I just wait for 15-8 to appear?
>> >
>> > David
>> >
>>
>> Yes .. it should be on mirror.centos.org now .. you could change the
>> repo where your updates come from.  OR .. wait for that mirror to get
>> updated.
> 
> 
> I just did
> yum clean all
> yum update
> 
> and 15-8 showed up.  Maybe the 'clean all' did it, or maybe just showed up.
> 
> I applied the update (yum update), rebooted and...
> no boot.  Just a blank screen.
> 
> Hardware is a Mac-Mini :-(
> 
> This is not an essential machine, so I could re-install (from
> netinstall) if you think it's worth the effort.
> 
> Or what?
> 
> David

You just need to reinstall the kernel and it should work.

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