Re: [Xen-users] Fedora 11 Xen guest install not completing

[Michael Brown <mrb137@xxxxxxxxx>]

On Sat, Jan 9, 2010 at 9:17 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> On Fri, Jan 08, 2010 at 03:20:30PM -0500, Michael Brown wrote:
>> Host: Red Hat Enterprise Linux 5.4
>> Hardware: HP Proliant BL460c G6
>> 48G RAM total
>>
>> When attempting to install a Fedora 11 Xen guest, the guest install is
>> freezing at "initializing cgroup subsys net_cls".  I currently have
>> RHEL 5.4 and RHEL 4.8 guests running successfully under the same dom0,
>> each using 4G RAM.  I have attempted to load the Fedora 11 guest with
>> anything between 1G and 4G RAM, and between 1-4 CPUs, all with the
>> same result.  Has anyone seen this before when loading Fedora as a
>> guest, and know what I need to do to resolve this under Xen?
>>
>
> What kind of hardware you have?
>
> RHEL 5.4 Xen has a bug, where it doesn't mask out some cpuid features
> of some new CPUs from the guest. This can cause problems with some guests.
>
> Fedora 11 default (installer) kernel has a bug, where it tries to use
> some forbidden features in the guest, if they're not masked out by
> hypervisor cpuid masking.
>
> So these two bugs combined can make F11 guest crash on EL 5.4 Xen.
>
> Two solutions:
>
> - Run later F11 (update) kernel in the guest, which has this bug fixed.
>  (obviously not possible for the installer..)
> - Run updated Xen on the host. There's a 'virttest' kernel available for
>  RHEL 5.4, which fixes this cpuid masking bug. This fix will also be
>  part of upcoming RHEL 5.5.
>
> I'm not sure if this is the bug you're seeing, but it could be.. depends
> on your hardware.
>
> See: https://bugzilla.redhat.com/show_bug.cgi?id=524719
>
> So either try the 'virttest' kernel from that bugzilla, or then the
> latest EL 5.5 beta kernel from:
> http://people.redhat.com/jwilson/el5/
>
> -- Pasi
>
>

Thanks for the info and links!

The hardware I'm using is an HP Proliant BL460c G6 blade server.  I
can't tell from the bugzilla if this hardware is affected by the bugs
you mentioned or not.  In any event, I will try the test/beta kernels
to determine if those resolve the issue.

Michael

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