4 Jan
2018
4 Jan
'18
5:57 p.m.
Hi,
I haven't had chance to personally check this out but apparently the
latest CentOS 7 kernel package doesn't boot under Xen PV:
https://bugs.centos.org/view.php?id=13763
This may be highly relevant to you because an update was just pushed
out for the KPTI feature (to help mitigate Spectre/Meltdown etc in
Linux).
As mentioned in that bug report, there are patches to fix this but
they haven't yet been applied to the main CentOS kernel package.
In the mean time you can use the kernel package from the CentOSPlus
repository which does have this fix and the KPTI one.
https://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus
All of this was researched by a customer having the problem today
and it resolved it for them.
Cheers,
Andy
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https://bitfolk.com/ -- No-nonsense VPS hosting
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6 Jan
6 Jan
8:34 a.m.
On 4 Jan 2018, at 17:57, Andy Smith <andy(a)bitfolk.com> wrote:
I haven't had chance to personally check this out
but apparently the
latest CentOS 7 kernel package doesn't boot under Xen PV:
https://bugs.centos.org/view.php?id=13763
This may be highly relevant to you because an update was just pushed
out for the KPTI feature (to help mitigate Spectre/Meltdown etc in
Linux).
As mentioned in that bug report, there are patches to fix this but
they haven't yet been applied to the main CentOS kernel package.
In the mean time you can use the kernel package from the CentOSPlus
repository which does have this fix and the KPTI one.
https://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus
All of this was researched by a customer having the problem today
and it resolved it for them.
This was fine until CentOS updated the CentOSPlus kernel overnight. Now the updated one
fails to boot in exactly the same way as the standard CentOS kernel. This must be some
change they have made to mitigate the CPU vulnerabilities.
I think we’ll have to stay on the standard kernel version 3.10.0-693.11.1 until more
information is available.
Cheers,
Mike
9:06 a.m.
On 6 Jan 2018, at 08:34, Mike Zanker <mike(a)zanker.uk> wrote:
This was fine until CentOS updated the CentOSPlus
kernel overnight. Now the updated one fails to boot in exactly the same way as the
standard CentOS kernel. This must be some change they have made to mitigate the CPU
vulnerabilities.
I think we’ll have to stay on the standard kernel version 3.10.0-693.11.1 until more
information is available.
Further information/discussion here:
https://discussions.citrix.com/topic/392239-new-centos-6-kernel-fails-to-bo…
<https://discussions.citrix.com/topic/392239-new-centos-6-kernel-fails-to-boot-on-xenserver-65/>
(CentOS 6 but same issue)
https://www.centos.org/forums/viewtopic.php?f=13&t=65602
<https://www.centos.org/forums/viewtopic.php?f=13&t=65602>
Cheers,
Mike
24 Feb
24 Feb
6:48 a.m.
Hi,
On Sat, Jan 06, 2018 at 08:34:48AM +0000, Mike Zanker wrote:
On 4 Jan 2018, at 17:57, Andy Smith
<andy(a)bitfolk.com> wrote:
Just a quick note that someone has built a CentOS 7 kernel with a
fix for this problem, as described here:
<https://kevandrews.uk/centos-7-xen-pv-guests-failing-boot-kernel-3100-693171el7>
Following the link to the bug report at
<https://bugs.centos.org/view.php?id=14347>, it says that the next
CentOS Plus kernel update will include this fix.
So if you're using CentOS 7 and are affected by this then it sounds
like the way to go would be to install that kernel and get future
kernels from Plus also.
Hopefully at the next point release of CentOS 7 they would include a
fixed kernel in the main repository.
As far as I am aware the kernel package in CentOS 6 has already had
this problem fixed.
Cheers,
Andy
--
https://bitfolk.com/ -- No-nonsense VPS hosting
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In the mean time you can use the kernel package
from the CentOSPlus
repository which does have this fix and the KPTI one.
https://wiki.centos.org/AdditionalResources/Repositories/CentOSPlus
All of this was researched by a customer having the problem today
and it resolved it for them.
This was fine until CentOS updated the CentOSPlus kernel
overnight. Now the updated one fails to boot in exactly the same
way as the standard CentOS kernel.
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days inactive
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Mike Zanker