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[Jürg Häfliger <1812620@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1812620

Title:
  msg_zerocopy.sh in net from ubuntu_kernel_selftests failed

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe package in Ubuntu:
  Invalid
Status in linux-hwe source package in Bionic:
  Fix Released
Status in linux source package in Disco:
  Won't Fix
Status in linux source package in Eoan:
  Won't Fix
Status in linux source package in Focal:
  Fix Released

Bug description:
  == SRU Justification [ FOCAL ] ==

  The msg_zerocopy.sh kernel self test will fail on machines that don't
  have 2 or 3 CPUs such as 1 CPU cloud instances since the C test
  program tries to set CPU affinity to CPUs 2 and 3 and bails out if it
  fails.

  == Fix ==

  Upstream linux-next commit

  commit 16f6458f2478b55e2b628797bc81a4455045c74e
  Author: Willem de Bruijn <willemb@xxxxxxxxxx>
  Date:   Wed Aug 5 04:40:45 2020 -0400

      selftests/net: relax cpu affinity requirement in msg_zerocopy test

  The fix now just emits a warning that CPU affinity can't be set rather
  than cause an exit(1) termination.

  == Test cast ==

  Run the msg_zerocopy.sh test from the kernel net selftest on a 1 CPU
  system. Without the fix the test fails. With the fix it runs
  successfully as expected.

  == Regression Potential ==

  The original test pinned the CPUs for a benchmarking metric, for our
  testing we are using this to test to see if the operations in the test
  work successfully.  There is a potential that users using this test
  will not notice the warning if they are using this test as a benchmark
  on a 1 CPU system and may get more jittery timing in their benchmarks
  rather than a test failing and complaining they are not running it on
  a suitable multi-CPU system.  However, the likelyhood of a user using
  this test on a single CPU system for benchmarking is small and as it
  stands the test will now run and produce potentially jittery
  benchmarks on a 1 CPU system compared to previously where it never
  ran.

  --------------------

  This test will return 1

  $ sudo ./msg_zerocopy.sh
  ipv4 tcp -t 1
  ./msg_zerocopy: setaffinity 2
  ./msg_zerocopy: setaffinity 3
  $ echo $?
  1

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-13-generic 4.18.0-13.14
  ProcVersionSignature: User Name 4.18.0-13.14-generic 4.18.17
  Uname: Linux 4.18.0-13-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Jan 21 07:41 seq
   crw-rw---- 1 root audio 116, 33 Jan 21 07:41 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu13.1
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Date: Mon Jan 21 07:50:33 2019
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lsusb: Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
  PciMultimedia:

  ProcFB: 0 cirrusdrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-13-generic root=UUID=2a4b0342-a2dd-4feb-b3e2-9644ca1c4a60 ro console=ttyS0,115200n8
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-13-generic N/A
   linux-backports-modules-4.18.0-13-generic  N/A
   linux-firmware                             1.175.1
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: Ubuntu-1.8.2-1ubuntu1
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-i440fx-xenial
  dmi.modalias: dmi:bvnSeaBIOS:bvrUbuntu-1.8.2-1ubuntu1:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-xenial:cvnQEMU:ct1:cvrpc-i440fx-xenial:
  dmi.product.name: Standard PC (i440FX + PIIX, 1996)
  dmi.product.version: pc-i440fx-xenial
  dmi.sys.vendor: QEMU

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