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Created attachment 1711511 [details]
Reproduce script

Description of problem:

When an unmanaged interface is a bridge port. Activate the profile with
empty `connection.master` does not remove that interface from bridge port.

Version-Release number of selected component (if applicable):
NetworkManager-1.26.0-3.el8.x86_64

How reproducible:
100%

Steps to Reproduce:
1. sudo ./bug_unmanaged_linux_bridge_port.sh
2.
3.

Actual results:

The dummy0 is still a bridge port

+ nmcli c up dummy0
Connection successfully activated (D-Bus active path: /org/freedesktop/NetworkManager/ActiveConnection/56)
+ ip link show dummy0
159: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UNKNOWN mode DEFAULT group default qlen 1000

Expected results:

The dummy0 is not bridge port any  more.

Additional info:

Created attachment 1711512 [details]
System logs with NM trace enabled

Merge request:

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/616

CI test added:
https://gitlab.freedesktop.org/NetworkManager/NetworkManager-ci/-/merge_requests/670

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 (Moderate: NetworkManager and libnma security, bug fix, and enhancement update), 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/RHSA-2021:1574