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Created attachment 1656185 [details]
Reproducer

If a connection for a virtual device is added and its master is not
present, NetworkManager creates the link without activating the
connection.

This bug was found by nmstate CI, where a VLAN enslaved to an ovs-port
was created even when the master was not present due to lack of the
NM-ovs plugin. Then NM failed to create another VLAN because the first
one already existed with the same id.

Reproducer script in attachment.

NM version: current git master

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/merge_requests/403

Upstream fix:

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/commit/4bdf8c31d3671948ec61564e39c6747b5fdc5fc6

test case added:
bridge_no_link_till_master

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1847