[libvirt-users] [libvirt] libvirt 1.2.10 and latest EL6 qemu-kvm

[Kashyap Chamarthy]

On Mon, Jan 19, 2015 at 08:25:55PM +0100, Franky Van Liedekerke wrote:
> 
> 
> Kashyap Chamarthy <kchamart at redhat.com> schreef op 19 januari 2015 19:00:23 CET:

[. . .]

> >> And as a result, when doing 'virsh start' (virsh define worked ok),
> >the following error occured: 
> >> 
> >> 2015-01-19 15:05:26.539+0000: 4347: error :
> >qemuMonitorJSONCheckError:379 : internal error: unable to execute QEMU
> >command 'qom-list': The command qom-list has not been

I forgot to note, your error message is truncated. I guess it's
'qom-list has not been found"

> >You seem to be hitting this bug (although the bug is for RHEL7, looks
> >like the same behavior):
> >
> >    https://bugzilla.redhat.com/show_bug.cgi?id=1082124
> >
> >Where Michal Privoznik says, it should already be fixed with these
> >commits in libvirt:
> >
> >  730af8f2cd7bc0e4c98b97200857909f42ea817f --
> >  qemuMonitorJSONGetCPUx86Data: Don't fail on ancient qemus
> >  84f69602143551433e3e0a5226dc572ecb33c059 -- qemu: Check for presence
> >  of device and properities when getting CPUID
> >  a6a6f84af92a506f83fdecf56f292bcb89905492 -- qemu: Change return type
> >  of qemuMonitorGetGuestCPU() 
> >> 
> >> The only thing I could do (even downgrading libvirt to 1.2.9 didn't
> >> work), was to downgrade qemu-kvm to the older version again ...  Any
> >> hints on this? 
> >
> >For the EL distrubtione you're using, I think using whatever the newest
> >supported combination of libvirt and QEMU should help. 
> 
> Yes, I know it's old but there is no newer qemu-kvm package on
> centos6. 

You can probably check with the oVirt project, who does rebuilds of QEMU

    http://resources.ovirt.org/pub/ovirt-3.5/rpm/el6Server/x86_64/

> But the bug you reported is not the same: it is about
> qom-list, not qom-get 

Your error message says: "unable to execute QEMU command 'qom-list'"

And, this commit message mentions 'qom-list'

  commit 730af8f2cd7bc0e4c98b97200857909f42ea817f
  Author: Michal Privoznik <mprivozn at redhat.com>
  Date:   Tue Nov 19 15:42:28 2013 +0100
  
      qemuMonitorJSONGetCPUx86Data: Don't fail on ancient qemus
      
      On the domain startup, this function is called to dump some info about
      the CPUs. At the beginning of the function we check if we aren't running
      older qemu which is not exposing the CPUs via 'qom-list'. However, we
      are not checking for even older qemus, which throw 'CommandNotFound'
      error.
      
      Signed-off-by: Michal Privoznik <mprivozn at redhat.com

> and also: it workerd fine with an older qemu-kvm
> package. So I guess something in the newer qemu-kvm package has
> changed and libvirt is not yet taking that into account. 

I'm not an expert on this subject, but if you want to narrow down the
issue further, you might want to investigate with libvirt debug logs

    http://wiki.libvirt.org/page/DebugLogs

>
> I"d be more
> than happy to update qemu-kvm to something newer, but that requires a
> lot more work ...


-- 
/kashyap