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Still hit it in rhel6.6, we confirmed with developer whether need to file bug on rhel6 once the same issue is closed as won't fix on rhel7, he said we still need to file bug on rhel6 because there's also some features which will be disabled on rhel7 but will be enabled on rhel6.

host info:
# uname -r && rpm -q qemu-kvm-rhev
2.6.32-496.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.437.el6.x86_64

guest info:
# uname -r
2.6.32-496.el6.x86_64

Best Regards,
sluo

Agree with the WONTFIX from RHEL7: very unlikely to be hit in the field, low priority.