msg_zerocopy in net from ubuntu_kernel_selftests failed

[Po-Hsu Lin]

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

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Po-Hsu Lin (cypressyew)]

Found in 4.18 Bionic AWS as well.

[Po-Hsu Lin (cypressyew)]

Didn't see this on 5.0 B-AWS

[Po-Hsu Lin (cypressyew)]

Saw this on 5.0 D-AWS (at lease on c4.large, m4.large)

[Po-Hsu Lin (cypressyew)]

For this issue on D-Azure 5.0
5.0.0-1023.24

It's not failing with all the instances.

Failed:
  * Standard_B1ms
  * Standard_F2s_v2
  * Standard_E2s_v3
  * Standard_D2s_v3

Passed:
  * Standard_L8s_v2
  * Standard_L4s
  * Standard_GS2
  * Standard_F32s_v2
  * Standard_D16s_v3

Test output on an instance (Standard_B1ms) that failed with this test:
 selftests: net: msg_zerocopy.sh
 ========================================
 ipv4 tcp -t 1
 ./msg_zerocopy: setaffinity 2
 ./msg_zerocopy: setaffinity 3
 not ok 1..20 selftests: net: msg_zerocopy.sh [FAIL]

Test output on an instance (Standard_L8s_v2) that passed with this test:
 selftests: net: msg_zerocopy.sh
 ========================================
 ipv4 tcp -t 1
 tx=57024 (3558 MB) txc=0 zc=n
 rx=28513 (3558 MB)
 ipv4 tcp -z -t 1
 tx=49763 (3105 MB) txc=49763 zc=n
 rx=24883 (3105 MB)
 ok
 ipv6 tcp -t 1
 tx=59548 (3716 MB) txc=0 zc=n
 rx=29775 (3716 MB)
 ipv6 tcp -z -t 1
 tx=49549 (3092 MB) txc=49549 zc=n
 rx=24776 (3092 MB)
 ok
 ipv4 udp -t 1
 tx=51972 (3243 MB) txc=0 zc=n
 rx=51963 (3242 MB)
 ipv4 udp -z -t 1
 tx=41616 (2596 MB) txc=41616 zc=n
 rx=41615 (2596 MB)
 ok
 ipv6 udp -t 1
 tx=53761 (3354 MB) txc=0 zc=n
 rx=53736 (3353 MB)
 ipv6 udp -z -t 1
 tx=41872 (2612 MB) txc=41872 zc=n
 rx=41872 (2612 MB)
 ok
 OK. All tests passed
 ok 1..20 selftests: net: msg_zerocopy.sh [PASS]