Nmap hangs on VLAN interface

[dmiller-nmap]

Discovered this bug report, which sounds like it may not be a Nmap-specific issue, but worth looking into:
https://forums.opensuse.org/showthread.php/505740-tcpdump-nmap-hangs-on-VLAN-interface

So there are phisycal Iface (eth0 for example) unassined any IP:
and VLAN iface over it (eth0.30)
There is no problem with data interchange via the VLAN iface.
But while I start tcpdump -nti eth0.30 or nmap -O 172.xx.xx.yy
I get completely hanged terminal session (I use PuTTY terminal).
Moreover, the process started does not receives any SIGNAL – nor -HUP, -TERM, -9 and still stays in memory until reboot.
While there were no VLAN ifaces at all, both sniffer and portscanner worked fine.

Reported on Nmap 5.21 (OpenSUSE 11.4) and Nmap 6.40 (OpenSUSE 13.1)

[cpandya2909]

I faced the same problem with nmap in multiple vlan.
I used --unprivileged option and nmap worked for me