[ovs-discuss] The function compose_output_action__ has a serious bug

[Wangyong]

Dear all,
I'think the function compose_output_action__ has a serious bug.

When the host A has to virtual machine VMa and VMb. if huge traffic from VMa to VMb, then offline
the VMb, and this function enter the first condition. so the action length is zero. so when return, the
OVS will generate a DROP flow entry to the datapath.
    if (!xport) {
        xlate_report(ctx, "Nonexistent output port");
        return;
    } else if (xport->config & OFPUTIL_PC_NO_FWD) {
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