Comment 22 for bug 1811515

Reviewed: https://review.opendev.org/666845
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=8ecad3ca4b3ebb655440ad926de5029e0d2ccc1b
Submitter: Zuul
Branch: master

commit 8ecad3ca4b3ebb655440ad926de5029e0d2ccc1b
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Fri Jun 21 13:57:26 2019 +0000

    Remove some synchronization decorators from ip_lib

    Removed the synchronization from the following ip_lib functions:
    * create_netns
    * remove_netns
    * list_netns

    The mentioned bug #1811515 and the corresponding patch [1], explain
    the problem of Pyroute2 NetNS class and the file descriptors used
    in a multithread environment. This is why, until a fix is applied to
    this library, a synchronization decorator was applied to all Pyroute2
    commands.

    However, the listed functions do not instantiate this class. These three
    methods only handle the filesystem in order to create, remove or list
    the system namespaces. That means those methods are not affected by the
    mentioned bug in Pyroute2 and it is safe to execute them without any
    synchronization.

    [1] https://review.opendev.org/#/c/631275/

    Change-Id: I71521efbdaf9bb6d7cd9650f77c52bf6e02c9ced
    Closes-Bug: #1833717
    Related-Bug: #1811515