Comment 19 for bug 1052535

in my environement, when quantum runs for a while , this bug would appear, even i didn't delete this network.

# ip netns exec qrouter-93a70ed7-ac17-41d3-9d92-4d8bfb0ee56a ip a
seting the network namespace failed: Invalid argument

futher more, i cann't delete it

# service quantum-l3-agent stop
quantum-l3-agent stop/waiting

# ip netns del qrouter-93a70ed7-ac17-41d3-9d92-4d8bfb0ee56a
Cannot remove /var/run/netns/qrouter-93a70ed7-ac17-41d3-9d92-4d8bfb0ee56a: Device or resource busy