[Bug 1995469] Re: Version 0.6.7-3 is broken for "del" operations on recent kernels

[James Page]

Raised bug task for jammy and uploaded for SRU team to review.

Note that this only impacts deployments where the HWE kernel is in use;
I've tested the proposed package both with the release kernel and the
HWE kernel on 22.04.


** Changed in: pyroute2 (Ubuntu Jammy)
       Status: Triaged => In Progress

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Title:
  Version 0.6.7-3 is broken for "del" operations on recent kernels

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive zed series:
  Fix Released
Status in pyroute2 package in Ubuntu:
  Fix Released
Status in pyroute2 source package in Jammy:
  In Progress
Status in pyroute2 source package in Kinetic:
  Fix Released

Bug description:
  [Impact]

  Because of this bug upstream
  https://github.com/svinota/pyroute2/issues/923, in the versions of
  pyroute2 prior to 0.6.10, all delete operations (address, link, route,
  ...) fail with 'Operation not supported'.

  This is related to the kernel commit
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a6cec0bcd34264be8887791594be793b3f12719f

  Pyroute package has to be upgraded to a version 0.6.10 or later as
  long as the distro comes with the kernel that contains the above
  commit.

  Reproducer:

  $ sudo python3
  Python 3.10.7 (main, Sep  8 2022, 14:34:29) [GCC 12.2.0] on linux
  Type "help", "copyright", "credits" or "license" for more information.
  >>> from pyroute2 import IPRoute
  >>> IPRoute().link("add", ifname="dum0", kind="dummy")
  ({'header': {'length': 36, 'type': 2, 'flags': 256, 'sequence_number': 255, 'pid': 4993, 'error': None, 'target': 'localhost', 'stats': Stats(qsize=0, delta=0, delay=0)}, 'event': 'NLMSG_ERROR'},)
  >>> IPRoute().link_lookup(ifname="dum0")
  [10]
  >>> IPRoute().link("del", ifname="dum0")
  Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/lib/python3/dist-packages/pr2modules/iproute/linux.py", line 1489, in link
      ret = self.nlm_request(msg, msg_type=command, msg_flags=msg_flags)
    File "/usr/lib/python3/dist-packages/pr2modules/netlink/nlsocket.py", line 401, in nlm_request
      return tuple(self._genlm_request(*argv, **kwarg))
    File "/usr/lib/python3/dist-packages/pr2modules/netlink/nlsocket.py", line 906, in nlm_request
      for msg in self.get(
    File "/usr/lib/python3/dist-packages/pr2modules/netlink/nlsocket.py", line 404, in get
      return tuple(self._genlm_get(*argv, **kwarg))
    File "/usr/lib/python3/dist-packages/pr2modules/netlink/nlsocket.py", line 732, in get
      raise msg['header']['error']
  pr2modules.netlink.exceptions.NetlinkError: (95, 'Operation not supported')

  ProblemType: Bug
  DistroRelease: Ubuntu 22.10
  Package: python3-pyroute2 0.6.7-3
  ProcVersionSignature: Ubuntu 5.19.0-23.24-generic 5.19.7
  Uname: Linux 5.19.0-23-generic x86_64
  ApportVersion: 2.23.1-0ubuntu3
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Nov  2 10:44:29 2022
  InstallationDate: Installed on 2021-08-18 (440 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: pyroute2
  UpgradeStatus: Upgraded to kinetic on 2022-10-23 (9 days ago)

  [Test Case]

  There is a small reproducer above that Eugene included in the bug
  report.

  Additionally we can use the standard charm-deployed regression test
  suite to test kinetic-zed support. nova-compute units can be inspected
  to see if the 'Operation not supported' errors are no longer produced
  in /var/log/neutron/neutron-ovn-metadata-agent.log.

  [Regression Potential]

  The patch has already landed in releases of pyroute2 0.6.10 and above.
  Since pyroute2 is also backported to the zed cloud archive (which is
  on jammy) we'll need to ensure that this patch behaves as expected
  with jammy-zed deploys as well.

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