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Description of problem:
Running a RHEL 6 RC guest on a RHEL 5.5 KVM host with all current errata applied.

When issuing a 'virsh shutdown rhel6guest', virsh confirms the shutdown in progress, but the guest continues to run. The problem does not exist with RHEL5 guests running on the same host.

How reproducible:
Always

Steps to Reproduce:
Run a RHEL 6 guest on a RHEL 5 KVM host and issue 'virsh shutdown GUEST' on the host.
  
Actual results:
RHEL 6 guests keeps running.

Expected results:
RHEL 6 guest gracefully shuts down

Additional info:
Assuming that the issue is in the virtio driver layer, so filing against kernel. Not sure if that is right though.

Suggesting to fix async after RHEL 6 GA.

Setting Priority to "URGENT" as this is expected to affect actual product environments.

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Please provide the XML for the RHEL6 guest, 'virsh dumpxml $GUESTNAME' and the log file /var/log/libvirt/qemu/$GUEST.log

Well, I do have a RHEL-5.5 kvm host at hand. I was able to reproduce the issue by installing a minimal RHEL-6 guest since minimal installation comes without acpid. After installing and starting acpid, the guest shutsdown normally on virsh shutdown. I guess you installed minimal guest without acpid, didn't you?

Great, thanks Jiri.  Daniel R., fair to close as not a bug?