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[Bug 1578141] Re: Predictable interface names partially broken with igb driver

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Dr. Jens Rosenboom" <j.rosenboom@xxxxxxxx>
Date: Tue, 17 May 2016 11:31:28 -0000
Reply-to: Bug 1578141 <1578141@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
@Martin: Fixing the installed system is easy, the bad case happens when
the installer sets up the system with "rename2" as the first interface,
making access via console necessary in order to recover.

root@compute-node37:~# SYSTEMD_LOG_LEVEL=debug udevadm test-builtin net_id /sys/class/net/eno1
calling: test-builtin
=== trie on-disk ===
tool version:          229
file size:         6841778 bytes
header size             80 bytes
strings            1755242 bytes
nodes              5086456 bytes
Load module index
timestamp of '/etc/systemd/network' changed
timestamp of '/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /lib/systemd/network/90-mac-for-usb.link
Created link configuration context.
ID_NET_NAME_MAC=enx002590d8975a
ID_OUI_FROM_DATABASE=Super Micro Computer, Inc.
ID_NET_NAME_ONBOARD=eno1
ID_NET_NAME_PATH=enp7s0f0
Unload module index
Unloaded link configuration context.
root@compute-node37:~# SYSTEMD_LOG_LEVEL=debug udevadm test-builtin net_id /sys/class/net/rename3                                                                                                                                                                                    
calling: test-builtin
=== trie on-disk ===
tool version:          229
file size:         6841778 bytes
header size             80 bytes
strings            1755242 bytes
nodes              5086456 bytes
Load module index
timestamp of '/etc/systemd/network' changed
timestamp of '/lib/systemd/network' changed
Parsed configuration file /lib/systemd/network/99-default.link
Parsed configuration file /lib/systemd/network/90-mac-for-usb.link
Created link configuration context.
ID_NET_NAME_MAC=enx002590d8975b
ID_OUI_FROM_DATABASE=Super Micro Computer, Inc.
ID_NET_NAME_ONBOARD=eno1
ID_NET_NAME_PATH=enp7s0f1
Unload module index
Unloaded link configuration context.

Also note that the whole renaming process seems to come from an Ubuntu
specific patch in Revert-udev-network-device-renaming-immediately-
give.patch, IIUC plain systemd would fail the renaming process and end
up with either (eno1, eth1) or (eth0, eno1) as interface tuples.

If there was a way to get rid of the race condition and make sure that
the system always ends up with the same tuple, that would already be a
large step forward.

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https://bugs.launchpad.net/bugs/1578141

Title:
  Predictable interface names partially broken with igb driver

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

Bug description:
  Note: I'm not sure whether this is really a kernel bug or something
  within systemd/udev, please advise how to further debug.

  On a system with two GE ports, instead of getting named eno1 and eno2,
  I am getting eno1 and renameN. Where N starts at 3 and increases by 2
  on every iteration of doing "rmmod igb;modprobe igb". The
  corresponding lines in dmesg look like this:

  [    2.748429] igb 0000:07:00.0: added PHC on eth0
  [    2.748431] igb 0000:07:00.0: Intel(R) Gigabit Ethernet Network Connection
  [    2.748433] igb 0000:07:00.0: eth0: (PCIe:5.0Gb/s:Width x4) 00:25:90:d7:60:8e
  [    2.748505] igb 0000:07:00.0: eth0: PBA No: 106100-000
  [    2.748506] igb 0000:07:00.0: Using MSI-X interrupts. 8 rx queue(s), 8 tx queue(s)
  [    2.802555] igb 0000:07:00.1: added PHC on eth1
  [    2.802557] igb 0000:07:00.1: Intel(R) Gigabit Ethernet Network Connection
  [    2.802559] igb 0000:07:00.1: eth1: (PCIe:5.0Gb/s:Width x4) 00:25:90:d7:60:8f
  [    2.802631] igb 0000:07:00.1: eth1: PBA No: 106100-000
  [    2.802632] igb 0000:07:00.1: Using MSI-X interrupts. 8 rx queue(s), 8 tx queue(s)
  [    2.803618] igb 0000:07:00.0 eno1: renamed from eth0
  [    2.833208] igb 0000:07:00.1 rename3: renamed from eth1

  What is even worse: Sometimes the naming changes and the second
  interface ends up as eno1 while the first interface is named renameN
  with an even N. The bad thing about this version is that when it
  happens while the installer is running, the installer will setup
  "rename2" as the primary network interface, which works fine for the
  installation itself, but after installation is finished and the first
  boot of the installed system happens, that interface will be gone,
  leaving the system without network connectivity.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May  4 09:48 seq
   crw-rw---- 1 root audio 116, 33 May  4 09:48 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Wed May  4 10:00:39 2016
  HibernationDevice: RESUME=/dev/mapper/compute--node37--vg-swap
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 001 Device 003: ID 0557:2221 ATEN International Co., Ltd Winbond Hermon
   Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Supermicro X9DRT-HF+
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic root=/dev/mapper/compute--node37--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/21/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3.0c
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X9DRT-HF+
  dmi.board.vendor: Supermicro
  dmi.board.version: 0123456789
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 17
  dmi.chassis.vendor: Supermicro
  dmi.chassis.version: 0123456789
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3.0c:bd05/21/2014:svnSupermicro:pnX9DRT-HF+:pvr0123456789:rvnSupermicro:rnX9DRT-HF+:rvr0123456789:cvnSupermicro:ct17:cvr0123456789:
  dmi.product.name: X9DRT-HF+
  dmi.product.version: 0123456789
  dmi.sys.vendor: Supermicro

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References

[Bug 1578141] [NEW] Predictable interface names partially broken with igb driver
From: Dr. Jens Rosenboom, 2016-05-04