Testing ERROR: "Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING."

[LIU Yulong]

Branch:
neutron master, HEAD: commit 7a0e5185c6cf7b5f8bcfe50576e86798947a7ba7

Exception:
      File "/home/yulong/github/neutron/neutron/agent/l3/dvr_edge_router.py", line 160, in initialize
        self._create_snat_namespace()
      File "/home/yulong/github/neutron/neutron/agent/l3/dvr_edge_router.py", line 181, in _create_snat_namespace
        self.snat_namespace.create()
      File "/home/yulong/github/neutron/neutron/agent/l3/dvr_snat_ns.py", line 32, in create
        super(SnatNamespace, self).create()
      File "/home/yulong/github/neutron/neutron/agent/l3/namespaces.py", line 95, in create
        ip_wrapper = self.ip_wrapper_root.ensure_namespace(self.name)
      File "/home/yulong/github/neutron/neutron/agent/linux/ip_lib.py", line 243, in ensure_namespace
        ip = self.netns.add(name)
      File "/home/yulong/github/neutron/neutron/agent/linux/ip_lib.py", line 696, in add
        'net.ipv4.conf.all.promote_secondaries=1'])
      File "/home/yulong/github/neutron/neutron/agent/linux/ip_lib.py", line 718, in execute
        run_as_root=run_as_root)
      File "/home/yulong/github/neutron/neutron/agent/linux/utils.py", line 147, in execute
        returncode=returncode)
    neutron_lib.exceptions.ProcessExecutionError: Exit code: 2; Stdin: ; Stdout: ; Stderr: Ncat: Invalid -w timeout (must be greater than 0). QUITTING.

Upstream log search:
http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%20%5C%22Exit%20code%3A%202%3B%20Stdin%3A%20%3B%20Stdout%3A%20%3B%20Stderr%3A%20Ncat%3A%20Invalid%20-w%20timeout%20(must%20be%20greater%20than%200).%20QUITTING.%5C%22

local testing:
http://paste.openstack.org/show/789733/

[Bernard Cafarelli (bcafarel)]

I think this is an old issue made more visible with https://review.opendev.org/#/c/705065/ change (we know get the error properly).

nc.openbsd accepts 0 for timeout (-w param), while ncat from nmap fails with relevant error.
I can not reproduce it locally though, even removing netcat-openbsd and installing nmap test still passes.

It may be a random failure that causes timeout parameter missing, in all cases we should make sure to have a proper value set.

I will bring it to next CI meeting

[Bernard Cafarelli (bcafarel)]

Nevermind, just saw https://bugs.launchpad.net/bugs/1863213 (I was on PTO so missed that one)