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Bug 2149012 - NM brings down interfaces attached to a ovs bridge after "nmcli networking off/on"
Summary: NM brings down interfaces attached to a ovs bridge after "nmcli networking of...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: NetworkManager
Version: 9.2
Hardware: Unspecified
OS: Unspecified
high
unspecified
Target Milestone: rc
: ---
Assignee: Fernando F. Mancera
QA Contact: Vladimir Benes
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-11-28 14:47 UTC by Beniamino Galvani
Modified: 2023-11-07 10:12 UTC (History)
12 users (show)

Fixed In Version: NetworkManager-1.43.10-1.el9
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-11-07 08:37:53 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker NMT-170 0 None None None 2023-01-24 11:44:50 UTC
Red Hat Issue Tracker RHELPLAN-140668 0 None None None 2022-11-28 14:49:43 UTC
Red Hat Product Errata RHBA-2023:6585 0 None None None 2023-11-07 08:38:18 UTC
freedesktop.org Gitlab NetworkManager NetworkManager-ci merge_requests 1350 0 None opened ovs: test vxlan on external OVS bridge is UP after networking off 2023-03-07 17:57:42 UTC
freedesktop.org Gitlab NetworkManager NetworkManager merge_requests 1512 0 None opened device: always queue recheck_assume before making device managed 2023-01-24 11:44:15 UTC
freedesktop.org Gitlab NetworkManager NetworkManager merge_requests 1642 0 None opened Fix managing external interfaces (wip) 2023-05-29 08:32:25 UTC

Description Beniamino Galvani 2022-11-28 14:47:06 UTC 
When a virtual interface is created outside of NetworkManager and attached to an ovs bridge, after disabling and re-enabling networking multiple times via "nmcli networking off; nmcli networking on", NetworkManager brings the interface down. This can be reproduced with the following commands:

  ip link add vxlan1 type vxlan remote 172.25.12.1 id 120 dstport 0
  ip link set vxlan1 up
  ovs-vsctl add-br br1
  ovs-vsctl add-port br1 vxlan1

  ovs-vsctl show
  ip link show vxlan1

  nmcli networking off
  nmcli networking on

  sleep 1

  nmcli networking off
  nmcli networking on

  ovs-vsctl show
  ip link show vxlan1

At the end, vxlan1 is down:

  272: vxlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc noqueue master ovs-system state DOWN mode DEFAULT group default qlen 1000

The expected result is that the interface is not touched by NM since it was created externally.

Affected versions:
NetworkManager 1.30, NetworkManager 1.40, current git main
Comment 1 Beniamino Galvani 2022-11-28 14:55:29 UTC 
Initially, the vxlan is in disconnected state and is considered 'external'.

  [1669644967.4654] device (vxlan1): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external')

The problem is that after toggling networking, the 'external' state is lost and the device becomes fully managed.

  [1669644995.0894] device (vxlan1): state change: disconnected -> unmanaged (reason 'sleeping', sys-iface-state: 'external')
  [1669645001.8996] device (vxlan1): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
  [1669645001.9245] device (vxlan1): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'managed')

At this point a "networking off" will bring the interface down.
Comment 13 Vladimir Benes 2023-04-20 13:00:06 UTC 
after a certain amount of repetitions, I still see missing LOWER_UP
see attachment
Comment 20 Beniamino Galvani 2023-05-29 08:37:44 UTC 
> adding may_fail tag to the ovs_vxlan_networking_off_on test

I couldn't reproduce the new failure with the NMCI test, but according to logs it seems caused by a race condition in NM that makes the external device fully managed by NM

By stopping and resuming NM at the right time the issue is 100% reproducible:

  # Temporarily stop NetworkManager to trigger the race condition, which                                                                                       
  # happens when NM detects the interface already attached to the OVS                                                                                          
  # bridge and already announced by udev.
  killall -STOP NetworkManager
  ip link add vxlan1 type vxlan remote 172.25.12.1 id 120 dstport 0
  ip link set vxlan1 up
  ovs-vsctl add-br br1
  ovs-vsctl add-port br1 vxlan1
  sleep .4
  killall -CONT NetworkManager

  ovs-vsctl show
  ip link show vxlan1

  nmcli networking off
  nmcli networking on

  sleep 1

  nmcli networking off
  nmcli networking on

  ovs-vsctl show
  ip link show vxlan1
  # vxlan1 is DOWN now
Comment 24 Vladimir Benes 2023-07-03 14:09:20 UTC 
working well, moving to verified
Comment 26 errata-xmlrpc 2023-11-07 08:37:53 UTC 
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 (NetworkManager 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-2023:6585
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