Unfair CPU possession by a qemu-kvm task; RHEL5 guests on a RHEL6 host

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Issue

When running RHEL5 KVM guests on a RHEL6 host, some guests sometimes experience "Soft lockup" error messages
Guests eventually resume normal operation without intervention

Environment

Red Hat Enterprise Linux 6.1 & 6.2
Kernel versions prior to kernel-2.6.32-220.2.1.el6
Running RHEL5 guests under KVM

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