group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Would it be possible for you to test the latest upstream stable kernel?
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the
latest v4.4 stable kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4.141

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Incomplete

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

-- 
You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1782544

Title:
  tcpreplay and veth device; extra transmit bytes on 4.4.0-130-generic
  kernel

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Incomplete

Bug description:
  Issue found in a test harness for some code running on Ubuntu 16.04.4
  LTS where we use a veth device to play in packets to the code under
  test. Essentially we see an extra 14 bytes being transmitted at the
  end of every packet that is just random garbage. Problem came in with
  the  4.4.0-130 kernel; if I revert to the 4.4.0-128 kernel the issue
  goes away. I have verified the issue on several different boxes
  running 16.04

  
  The following steps reproduce the problem:

  1) Veth setup

  sudo ip link add name nic1 type veth peer name nic2
  sudo sysctl -q -w net.ipv6.conf.nic1.disable_ipv6=1
  sudo sysctl -q -w net.ipv6.conf.nic2.disable_ipv6=1
  sudo ip link set nic1 up
  sudo ip link set nic2 up

  2) Configure tcpdump to collect packets on one interface:

  sudo tcpdump -i nic1 -w outPkts.pcap

  3) Play in packets on the other (Any pcap will do):

  sudo tcpreplay -q -i nic2 inPkts.pcap

  When I check ifconfig I can see nic2/nic1 transmitting/receiving more
  bytes than expected. Opening the capture seen by tcpdump shows an
  extra 14 bytes received for every packet when compared to the input.

  
  tcpreplay version info:
    tcpreplay version: 3.4.4 (build 2450) (debug)
    Copyright 2000-2010 by Aaron Turner <aturner at synfin dot net>
    Cache file supported: 04
    Not compiled with libdnet.
    Compiled against libpcap: 1.7.4
    64 bit packet counters: enabled
    Verbose printing via tcpdump: enabled
    Packet editing: disabled
    Fragroute engine: disabled
    Injection method: PF_PACKET send()

  tcpdump version info
    tcpdump version 4.9.2
    libpcap version 1.7.4
    OpenSSL 1.0.2g  1 Mar 2016

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-130-generic 4.4.0-130.156
  ProcVersionSignature: Ubuntu 4.4.0-130.156-generic 4.4.134
  Uname: Linux 4.4.0-130-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  spw        3336 F.... pulseaudio
   /dev/snd/controlC0:  spw        3336 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Jul 19 10:30:07 2018
  HibernationDevice: RESUME=UUID=032369ab-18b8-41c3-a386-4ed08706f461
  InstallationDate: Installed on 2016-11-03 (622 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  MachineType: Dell Inc. OptiPlex 7010
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-130-generic root=UUID=7b20f97c-4edc-4af1-bdbb-72ccb26cfbec ro quiet splash intel_iommu=on
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-130-generic N/A
   linux-backports-modules-4.4.0-130-generic  N/A
   linux-firmware                             1.157.20
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/12/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 0KRC95
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A02
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd08/12/2013:svnDellInc.:pnOptiPlex7010:pvr01:rvnDellInc.:rn0KRC95:rvrA02:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 7010
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1782544/+subscriptions