apport information

** Attachment added: "CurrentDmesg.txt"

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  ipvsadm --ops causes CPU soft lockup on traffic

Status in linux package in Ubuntu:

Bug description:
  Using IPVS with One-Packet Scheduling on UDP causes CPU soft lockup on

  Steps to reproduce:

  1. Install ipvsadm and netcat-openbsd
  2. Execute `ipvsadm -a -u -s rr --ops && ipvsadm -A -u -r -m -w 1`
  3. Execute `nc -l -k -u 1235` to actually have a listening service
  4. In another terminal, generate traffic `while sleep 0.01; do date | nc -u 
-w 0 1234; done`

  In only takes several packets (around 100 in my tests) to cause the
  soft lockup to appear. Even with lower packet rates (sleep 1 for
  example), the bug occurs.

  This problem is already fixed in the current 4.20 vanilla kernel but
  is present in the 4.15 vanilla kernel (tested packages from the
  kernel-ppa). So basically, this would be a backport.

  Ubuntu release: Ubuntu 18.04.1 LTS
  Kernel version: Ubuntu 4.15.0-43.46-generic 4.15.18
  ProblemType: Bug
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 10 11:37 seq
   crw-rw---- 1 root audio 116, 33 Jan 10 11:37 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.9-0ubuntu7.5
  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:
  DistroRelease: Ubuntu 18.04
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
   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: QEMU Standard PC (i440FX + PIIX, 1996)
  Package: linux (not installed)
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-43-generic 
root=UUID=27723a0b-84b7-4d41-ac73-d96bb9bc770a ro
  ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
   linux-restricted-modules-4.15.0-43-generic N/A
   linux-backports-modules-4.15.0-43-generic  N/A
   linux-firmware                             1.173.2
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  Tags:  bionic
  Uname: Linux 4.15.0-43-generic x86_64
  UnreportableReason: This report is about a package that is not installed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  _MarkForUpload: False 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-2.12
  dmi.modalias:,1996):pvrpc-i440fx-2.12:cvnQEMU:ct1:cvrpc-i440fx-2.12: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-2.12
  dmi.sys.vendor: QEMU

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