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Created attachment 1698418 [details]
reproducer.log

Description of problem:
if the slaves were attached to bond with mode 802.3ad before, then it fails to create mode balance-tlb/alb

Version-Release number of selected component (if applicable):
nmstate-0.3.2-1.el8.noarch
NetworkManager-1.26.0-0.1.el8.x86_64
DISTRO=RHEL-8.3.0-20200616.0
Linux hp-dl388g8-08.rhts.eng.pek2.redhat.com 4.18.0-214.el8.x86_64 #1 SMP Fri Jun 12 08:55:08 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux


How reproducible:
100%

Steps to Reproduce:
1. Create bond0 with slaves veth0 and veth1, mode 802.3ad
2. remove bond0
3. create bond0(or any other name) with slaves veth0 and veth1, mode balance-tlb

Actual results:
Success

Expected results:
Fail

Additional info:
If you create balance-tlb with new slaves, it works well

It's a regression issue introduced by nmstate-0.3 and does not exists in nmstate-0.2.

Verified with versions:
nmstate-0.3.4-3.el8.noarch
NetworkManager-1.26.0-2.el8.x86_64
DISTRO=RHEL-8.3.0-20200728.n.0
Linux hpe-dl380pgen8-02-vm-9.hpe2.lab.eng.bos.redhat.com 4.18.0-228.el8.x86_64 #1 SMP Mon Jul 27 06:05:31 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Created attachment 1702938 [details]
verified.log

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 (nmstate 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/RHBA-2020:4696