Engine-setup fails with error message as: [ ERROR ] Failed to execute stage 'Setup validation': Failed to clear zombie commands. Please access support in attempt to resolve the problem

Issue

• engine-setup fails while performing major upgrade RHEV 3.x

[ INFO ] Stage: Setup validation
During execution engine service will be stopped (OK, Cancel) [OK]:
[ INFO ] Cleaning stale zombie tasks and commands
[ ERROR ] Failed to execute stage 'Setup validation': Failed to clear zombie commands. Please access support in attempt to resolve the problem
[ INFO ] Stage: Clean up
Log file is located at /var/log/ovirt-engine/setup/ovirt-engine-setup-20151109135655-1ta9ju.log
[ INFO ] Generating answer file '/var/lib/ovirt-engine/setup/answers/20151109135807-setup.conf'
[ INFO ] Stage: Pre-termination
[ INFO ] Stage: Termination
[ ERROR ] Execution of setup failed