We have a new kernel version coming soon that is currently in proposed.
Please try that kernel and let us know if you see the same problem.
There's detail on enabling proposed and updating to the 6.8.0-72 kernel
at https://canonical-kernel-docs.readthedocs-hosted.com/latest/how-
to/testing-verification/test-kernel-in-proposed/

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https://bugs.launchpad.net/bugs/2119655

Title:
  BFD session via bond interface cannot be established

Status in linux-hwe-6.8 package in Ubuntu:
  Confirmed

Bug description:
  That one's a bit special, but once we booted into 6.8.0-65.68, the BFD 
session in bird wouldn't come up.
  It was toggling between the states "Init" and "Down"

  With the previous version 6.8.0-57.59 it would work ok (booted back
  into that one to test)

  # /usr/sbin/birdc -rv show bfd sessions
  0001 BIRD 1.6.8 ready.
  0016 Access restricted
  1020-bfd1:
       IP address                Interface  State      Since       Interval  
Timeout
       141.42.4.42               bond0      Up         15:58:16      0.200    
0.600
       141.42.4.43               bond0      Up         15:58:16      0.200    
0.600

  The bird.conf:

  === snip ===
  log stderr all;

  router id from "bond0";

  # Lokale Devices/Interfaces einbeziehen.
  # u.a. fuer die automatische Erkennung der RouterID notwendig
  protocol device {
          scan time 10;
  };

  protocol bfd {
      interface "bond0" {
          interval 200 ms;
          multiplier 3;

          passive;
      };

      neighbor 141.42.4.42;
      neighbor 141.42.4.43;
  };
  === snap ===

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: linux-image-6.8.0-65-generic 6.8.0-65.68~22.04.1
  ProcVersionSignature: Ubuntu 6.8.0-57.59~22.04.1-generic 6.8.12
  Uname: Linux 6.8.0-57-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Aug  6 15:58 seq
   crw-rw---- 1 root audio 116, 33 Aug  6 15:58 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.11-0ubuntu82.10
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/timer', 
'/dev/snd/seq'] failed with exit code 1:
  CasperMD5CheckResult: unknown
  Date: Wed Aug  6 16:38:31 2025
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  MachineType: HP ProLiant DL360p Gen8
  PciMultimedia:
   
  ProcFB: 0 simpledrmdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-57-generic 
root=UUID=c6fc71dd-f3ee-46dd-827f-c03d86f6eefa ro gfxpayload=text nomodeset 
intel_iommu=igfx_off intremap=off
  RelatedPackageVersions:
   linux-restricted-modules-6.8.0-57-generic N/A
   linux-backports-modules-6.8.0-57-generic  N/A
   linux-firmware                            20220329.git681281e4-0ubuntu3.37
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux-hwe-6.8
  UpgradeStatus: Upgraded to jammy on 2024-04-09 (484 days ago)
  WifiSyslog:
   
  dmi.bios.date: 07/01/2015
  dmi.bios.vendor: HP
  dmi.bios.version: P71
  dmi.chassis.type: 23
  dmi.chassis.vendor: HP
  dmi.ec.firmware.release: 2.82
  dmi.modalias: 
dmi:bvnHP:bvrP71:bd07/01/2015:efr2.82:svnHP:pnProLiantDL360pGen8:pvr:cvnHP:ct23:cvr:sku654081-B21:
  dmi.product.family: ProLiant
  dmi.product.name: ProLiant DL360p Gen8
  dmi.product.sku: 654081-B21
  dmi.sys.vendor: HP

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