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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1457472

Title:
  TPACKET_V3 in Linux before 3.19 causes packet loss in libpcap

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Observed packet loss and major slowdown in Nmap on Ubuntu 14.04:
  https://github.com/nmap/nmap/issues/34

  Traced to this bug report for libpcap 1.5.3: https://github.com/the-
  tcpdump-group/libpcap/issues/380

  Underlying issue is a bug in the Linux kernel which was fixed in 3.19:
  https://github.com/torvalds/linux/commit/da413ee

  Please backport this patch to Ubuntu 14.04 LTS kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-53-generic 3.13.0-53.89
  ProcVersionSignature: Ubuntu 3.13.0-53.89-generic 3.13.11-ckt19
  Uname: Linux 3.13.0-53-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nmap      12401 F.... pulseaudio
   /dev/snd/pcmC0D0c:   nmap      12401 F...m pulseaudio
   /dev/snd/pcmC0D0p:   nmap      12401 F...m pulseaudio
   /dev/snd/timer:      nmap      12401 f.... pulseaudio
  CurrentDmesg: [   25.541696] init: plymouth-upstart-bridge main process ended, respawning
  Date: Thu May 21 07:42:08 2015
  HibernationDevice: RESUME=UUID=e4b6770e-dcc5-445d-a445-25d9a244e204
  InstallationDate: Installed on 2015-01-01 (139 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 002: ID 80ee:0021 VirtualBox USB Tablet
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: innotek GmbH VirtualBox
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-53-generic root=UUID=032922f2-3fe1-4228-8c93-8c1e9afc4289 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-53-generic N/A
   linux-backports-modules-3.13.0-53-generic  N/A
   linux-firmware                             1.127.12
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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