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[Po-Hsu Lin <2049391@xxxxxxxxxxxxxxxxxx>]

** Tags added: 6.8 arm64 noble sru-s20240902

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https://bugs.launchpad.net/bugs/2049391

Title:
  arp_ndisc_evict_nocarrier.sh from ubuntu_kselftests_net is flaky with
  Azure Standard_B1ms

Status in ubuntu-kernel-tests:
  New

Bug description:
  This test is just failing with Azure Standard_B1ms from J-azure-6.2 to
  M-azure. And it's never found failing on other Azure instances.

  Also it can be found on M-aws-6.5.0-1011.11 a1.medium and
  M-gcp-6.5.0-1009.9 g1.small as well.

  One common point on these 3 instances is that they're running with 2G
  ram

  
  Test log:
  $ sudo ./arp_ndisc_evict_nocarrier.sh
  run arp_evict_nocarrier=1 test
  failed
  run arp_evict_nocarrier=0 test
  ok
  run all.arp_evict_nocarrier=0 test
  ok
  run ndisc_evict_nocarrier=1 test
  ok
  run ndisc_evict_nocarrier=0 test
  ok
  run all.ndisc_evict_nocarrier=0 test
  ok

  dmesg output:
  [  279.196525] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  [  279.196557] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  [  279.309576] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  [  279.398842] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  [  279.494938] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  [  279.563290] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  [  279.635331] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready

  syslog output:
  2024-01-15T11:28:20.756379+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Link UP
  2024-01-15T11:28:20.781355+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.196525] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  2024-01-15T11:28:20.781369+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.196557] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  2024-01-15T11:28:20.781286+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Gained carrier
  2024-01-15T11:28:20.824786+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Lost carrier
  2024-01-15T11:28:20.829860+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Link DOWN
  2024-01-15T11:28:20.845170+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd[1]: run-netns-ns\x2dpeer\x2dajfTVM.mount: Deactivated successfully.
  2024-01-15T11:28:20.867943+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Link UP
  2024-01-15T11:28:20.893639+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.309576] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  2024-01-15T11:28:20.893848+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Gained carrier
  2024-01-15T11:28:20.920006+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Lost carrier
  2024-01-15T11:28:20.926994+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Link DOWN
  2024-01-15T11:28:20.943986+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd[1]: run-netns-ns\x2dpeer\x2dajfTVM.mount: Deactivated successfully.
  2024-01-15T11:28:20.965478+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Link UP
  2024-01-15T11:28:20.981462+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Gained carrier
  2024-01-15T11:28:20.988715+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.398842] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
  2024-01-15T11:28:21.022477+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Lost carrier
  2024-01-15T11:28:21.029149+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd-networkd[627]: veth0: Link DOWN
  2024-01-15T11:28:21.080992+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.494938] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  2024-01-15T11:28:21.148991+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.563290] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  2024-01-15T11:28:21.220994+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net kernel: [  279.635331] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
  2024-01-15T11:28:21.744921+00:00 l-laz-az-s2-stdb1ms-u-kselftests-net systemd[1]: run-netns-ns\x2dpeer\x2dajfTVM.mount: Deactivated successfully.

  The test is a bit flaky, it's not guaranteed to fail when I try to run
  this manually.

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