test_bpf in net from ubuntu_kernel_selftests failed on cloud kernels

[Po-Hsu Lin]

This test will attempt to insert the test_bpf module, but this module does not exist in KVM kernels:

$ sudo modprobe test_bpf
modprobe: FATAL: Module test_bpf not found in directory /lib/modules/4.15.0-1028-kvm

The script:
$ sudo ./test_bpf.sh
test_bpf: [FAIL]

$ cat test_bpf.sh
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# Runs bpf test using test_bpf kernel module

if /sbin/modprobe -q test_bpf ; then
 /sbin/modprobe -q -r test_bpf;
 echo "test_bpf: ok";
else
 echo "test_bpf: [FAIL]";
 exit 1;
fi

This test_bpf module will need the CONFIG_TEST_BPF to be enabled.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-1028-kvm 4.15.0-1028.28
ProcVersionSignature: User Name 4.15.0-1028.28-kvm 4.15.18
Uname: Linux 4.15.0-1028-kvm x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
Date: Thu Jan 17 08:29:29 2019
SourcePackage: linux-kvm
UpgradeStatus: No upgrade log present (probably fresh install)

[Po-Hsu Lin (cypressyew)]

Failed on Cosmic kernel as well.
$ sudo modprobe test_bpf
modprobe: FATAL: Module test_bpf not found in directory /lib/modules/4.18.0-14-generic

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

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1812189

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Po-Hsu Lin (cypressyew)]

Found on Xenial s390x as well. (only on s390x, passed on other architectures)

[Po-Hsu Lin (cypressyew)]

Could be fixed by commit https://kernel.ubuntu.com/git/ubuntu/autotest-client-tests.git/commit/?id=fd2e1daffb3c66241aa8898c015eefe9ba0bf429

[Po-Hsu Lin (cypressyew)]

Passed on B-4.18
 selftests: net: test_bpf.sh
 ========================================
 test_bpf: ok
 ok 1..8 selftests: net: test_bpf.sh [PASS]

[Po-Hsu Lin (cypressyew)]

Checked X/B/C, test passed.

[Po-Hsu Lin (cypressyew)]

This is still valid for KVM kernels. Re-open the bug.

$ sudo ./test_bpf.sh
test_bpf: [FAIL]
sudo /sbin/modprobe test_bpf
modprobe: FATAL: Module test_bpf not found in directory /lib/modules/4.18.0-1015-kvm

[Po-Hsu Lin (cypressyew)]

BTW fix in comment #5 is for generic kernel.

[Po-Hsu Lin (cypressyew)]

Failed on GKE 5.0 as well.

[Po-Hsu Lin (cypressyew)]

Re-open this bug as this is still an issue.

The test_bpf test in net failed with GKE 5.0.0-1030.31:
  test_bpf: [FAIL]
  not ok 1..9 selftests: net: test_bpf.sh [FAIL]

Further investigate shows this module will require config_test_bpf to be enabled in the kernel config.

[Po-Hsu Lin (cypressyew)]

This is not affecting the generic kernel as we have config_test_bpf set to m.

[Kelsey Steele (kelsey-steele)]

Failed on Bionic/oracle : 5.4.0-1026.26~18.04.1 : amd64

[Ian May (ian-may)]

bionic/linux-oracle-5.4: 5.4.0-1044.47~18.04.1

[Guilherme G. Piccoli (gpiccoli)]

Observed this on B/oracle-5.4, cycle sru-20210621 .

[Bartlomiej Zolnierkiewicz (bzolnier)]

Observed also on 2021.11.29/focal/linux-gcp/5.4.0-1059.63

[Luke Nowakowski-Krijger (lukenow)]

Found on 2022.01.31/xenial/kvm/4.4.0-1100.109