group.of.nepali.translators team mailing list archive

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

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

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

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

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

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

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

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

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1780761

Title:
  kernel 4.4.0-130-generic - packet loss with ip forward

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

Bug description:
  Reproduced with 16.04.4 LTS and Citrix Xenserver 7.0, 7.1, 7.4.
  Some packet loss is observed after upgrading to 4.4.0-130-generic when the traffic is routed via VM. 

  Steps to reproduce:
  1) Using Citrix Xenserver, set up Ubuntu server VM, upgrade to 4.4.0-130-generic
  2) Enable IP forwarding
  3) Send any traffic via this VM (for ex. icmp ping)
  4) Packets leaving the VM may not reach the second VM on the same physical host or not leave the physical host machine
  5) Packets coming to a physical host machine interface may not reach the virtual machine

  Rollback to 4.4.0-128-generic helps.

  A file with tcpdump results and a brief explanation is attached.

  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
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jul  9 11:24 seq
   crw-rw---- 1 root audio 116, 33 Jul  9 11:24 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.18
  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: Mon Jul  9 13:18:47 2018
  InstallationDate: Installed on 2018-06-04 (34 days ago)
  InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.8)
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb:
   Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd 
   Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Xen HVM domU
  PciMultimedia:
   
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-130-generic root=UUID=46979d34-98b0-470f-9f1f-29147de9f253 ro ipv6.disable=1 net.ifnames=0 biosdevname=0
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-130-generic N/A
   linux-backports-modules-4.4.0-130-generic  N/A
   linux-firmware                             1.157.19
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/14/2018
  dmi.bios.vendor: Xen
  dmi.bios.version: 4.7.5-4.4
  dmi.chassis.type: 1
  dmi.chassis.vendor: Xen
  dmi.modalias: dmi:bvnXen:bvr4.7.5-4.4:bd06/14/2018:svnXen:pnHVMdomU:pvr4.7.5-4.4:cvnXen:ct1:cvr:
  dmi.product.name: HVM domU
  dmi.product.version: 4.7.5-4.4
  dmi.sys.vendor: Xen

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