Verified for bionic-ussuri using the test script in comment #33

ubuntu@node-lepaute:~$ dpkg -l | grep pyroute2
ii  python3-pyroute2                     0.5.9-0ubuntu1~cloud0                  
         all          Python3 Netlink library
ubuntu@node-lepaute:~$ echo 63 | sudo tee 
/sys/class/net/enp3s0f0/device/sriov_numvfs
63
ubuntu@node-lepaute:~$ ./test-lp1904730.sh 
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/__init__.py", line 
1311, in _ft_decode_generic
    self.decode_nlas(offset)
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/__init__.py", line 
1436, in decode_nlas
    offset)
struct.error: unpack_from requires a buffer of at least 4 bytes

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./test-lp1904730.sh", line 7, in <module>
    link = ip.link('get', index=link_idx, ext_mask=1)[0]
  File "/usr/lib/python3/dist-packages/pyroute2/iproute/linux.py", line 1332, 
in link
    msg_flags=msg_flags)
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/nlsocket.py", line 373, 
in nlm_request
    return tuple(self._genlm_request(*argv, **kwarg))
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/nlsocket.py", line 864, 
in nlm_request
    callback=callback):
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/nlsocket.py", line 376, 
in get
    return tuple(self._genlm_get(*argv, **kwarg))
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/nlsocket.py", line 701, 
in get
    raise msg['header']['error']
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/nlsocket.py", line 177, 
in parse
    msg.decode()
  File 
"/usr/lib/python3/dist-packages/pyroute2/netlink/rtnl/ifinfmsg/__init__.py", 
line 1087, in decode
    nlmsg.decode(self)
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/__init__.py", line 982, 
in decode
    self._ft_decode(self, offset)
  File "/usr/lib/python3/dist-packages/pyroute2/netlink/__init__.py", line 
1314, in _ft_decode_generic
    raise NetlinkNLADecodeError(e)
pyroute2.netlink.exceptions.NetlinkNLADecodeError: unpack_from requires a 
buffer of at least 4 bytes
ubuntu@node-lepaute:~$ sudo add-apt-repository cloud-archive:ussuri-proposed
 Ubuntu Cloud Archive for OpenStack Ussuri [proposed]
 More info: https://wiki.ubuntu.com/OpenStack/CloudArchive
Press [ENTER] to continue or Ctrl-c to cancel adding it.
...
ubuntu@node-lepaute:~$ sudo apt-get upgrade python3-pyroute2
...
ubuntu@node-lepaute:~$ dpkg -l | grep pyroute2
ii  python3-pyroute2                     0.5.9-0ubuntu2~cloud0                  
         all          Python3 Netlink library
ubuntu@node-lepaute:~$ ./test-lp1904730.sh 
63

** Tags added: verification-done-bionic-ussuri

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https://bugs.launchpad.net/bugs/1904730

Title:
  neutron-agent-sriov fails to create port

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