[Bug 2085835] Re: "Predictable Network Interface Naming" suddenly changed the name from enp96s0f0 to enp96s0f0np0 causing outage

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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Title:
  "Predictable Network Interface Naming" suddenly changed the name from
  enp96s0f0 to enp96s0f0np0 causing outage

Status in linux package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  On three identical servers - sleds in a blade chassis.
  the NIC name of one of the servers suddenly changed, causing an outage. The netplan config could not assign IP to the interface due to the name change.

  enp96s0f0 to enp96s0f0np0

  The two other servers still have the enp96s0f0 name. No BIOS or other
  configuration change is detectable between the three systems.
  Firmware, software - all the same

  
  I tried to debug this issue myself, but it turned out to be a very niche and complicated topic.
  I went to submit an issue on https://github.com/systemd/systemd/issues, but they only accept issues for newer versions.

  System info:

  dundts at mongodb-rs2:~$ lsb_release -rd
  Description:    Ubuntu 22.04.3 LTS
  Release:        22.04

  dundts at mongodb-rs2:~$ apt-cache policy systemd
  system:
    Installiert:           249.11-0ubuntu3.11
    Installationskandidat: 249.11-0ubuntu3.12
    Versionstabelle:
       249.11-0ubuntu3.12 500
          500 http://de.archive.ubuntu.com/ubuntu jammy-updates/main amd64 Packages
   *** 249.11-0ubuntu3.11 100
          100 /var/lib/dpkg/status
       249.11-0ubuntu3.7 500
          500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages
       249.11-0ubuntu3 500
          500 http://de.archive.ubuntu.com/ubuntu jammy/main amd64 Packages

  dundts at mongodb-rs2:~$ sudo dmesg | grep i40e
  [sudo] password for dundts:
  [    3.657531] i40e: Intel(R) Ethernet Connection XL710 Network Driver
  [    3.658208] i40e: Copyright (c) 2013 - 2019 Intel Corporation.
  [    3.715866] i40e 0000:60:00.0: fw 3.1.54559 api 1.5 nvm 3.2d 0x80000b4b 1.1767.0 [8086:37d3] [152d:8a40]
  [    3.720222] i40e 0000:60:00.0: MAC address: d8:c4:97:4c:66:ae
  [    3.720558] i40e 0000:60:00.0: FW LLDP is enabled
  [    3.732613] i40e 0000:60:00.0: Added LAN device PF0 bus=0x60 dev=0x00 func=0x00
  [    3.733075] i40e 0000:60:00.0: Features: PF-id[0] VFs: 32 VSIs: 66 QP: 32 RSS FD_ATR FD_SB NTUPLE DCB VxLAN Geneve PTP VEPA
  [    3.788671] i40e 0000:60:00.1: fw 3.1.54559 api 1.5 nvm 3.2d 0x80000b4b 1.1767.0 [8086:37d3] [152d:8a40]
  [    3.804478] i40e 0000:60:00.1: MAC address: d8:c4:97:4c:66:af
  [    3.804964] i40e 0000:60:00.1: FW LLDP is enabled
  [    3.839982] i40e 0000:60:00.1 eth1: NIC Link is Up, 10 Gbps Full Duplex, Flow Control: None
  [    3.851939] i40e 0000:60:00.1: Added LAN device PF1 bus=0x60 dev=0x00 func=0x01
  [    3.877994] i40e 0000:60:00.1: Features: PF-id[1] VFs: 32 VSIs: 66 QP: 32 RSS FD_ATR FD_SB NTUPLE DCB VxLAN Geneve PTP VEPA
  [    4.065330] i40e 0000:60:00.0 enp96s0f0np0: renamed from eth0
  [    4.096320] i40e 0000:60:00.1 enp96s0f1np1: renamed from eth1

  dundts at mongodb-rs2:~$ sudo udevadm info /sys/class/net/enp96s0f0np0
  P: /devices/pci0000:5d/0000:5d:00.0/0000:5e:00.0/0000:5f:03.0/0000:60:00.0/net/enp96s0f0np0
  L: 0
  E: DEVPATH=/devices/pci0000:5d/0000:5d:00.0/0000:5e:00.0/0000:5f:03.0/0000:60:00.0/net/enp96s0f0np0
  E: INTERFACE=enp96s0f0np0
  E: IFINDEX=2
  E: SUBSYSTEM=net
  E: USEC_INITIALIZED=4079509
  E: ID_MM_CANDIDATE=1
  E: ID_NET_NAMING_SCHEME=v249
  E: ID_NET_NAME_MAC=enxd8c4974c66ae
  E: ID_OUI_FROM_DATABASE=Quanta Computer Inc.
  E: ID_NET_NAME_PATH=enp96s0f0np0
  E: ID_BUS=pci
  E: ID_VENDOR_ID=0x8086
  E: ID_MODEL_ID=0x37d3
  E: ID_PCI_CLASS_FROM_DATABASE=Network controller
  E: ID_PCI_SUBCLASS_FROM_DATABASE=Ethernet controller
  E: ID_VENDOR_FROM_DATABASE=Intel Corporation
  E: ID_MODEL_FROM_DATABASE=Ethernet Connection X722 for 10GbE SFP+
  E: ID_PATH=pci-0000:60:00.0
  E: ID_PATH_TAG=pci-0000_60_00_0
  E: ID_NET_DRIVER=i40e
  E: ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
  E: ID_NET_NAME=enp96s0f0np0
  E: NM_UNMANAGED=1
  E: SYSTEMD_ALIAS=/sys/subsystem/net/devices/enp96s0f0np0
  E: TAGS=:systemd:
  E: CURRENT_TAGS=:system:

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