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[Jürg Häfliger <1917609@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1917609

Title:
  [Regression] ubuntu_bpf failed to build on Groovy

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Groovy:
  Fix Released

Bug description:
  [Impact]
  Upstream commit d3bec0138bfbe58606fc1d6f57a4cdc1a20218db (bpf: Zero-fill re-used per-cpu map element) was applied to Groovy as part of an upstream stable update. This patch fixes a bpf issue and at the same time adds new selftests to verify these changes. However, the selftests can't be compiled on 5.8 due to missing helper functions that were added only later. The bpf selftest build fails with errors such as:

  /usr/bin/ld: /tmp/autopkgtest.IzBxE1/build.8NX/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/bpf/map_init.test.o: in function `prog_run_insert_elem':
    /tmp/autopkgtest.IzBxE1/build.8NX/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/bpf/prog_tests/map_init.c:89: undefined reference to `ASSERT_OK'

  [Fix]
  The proposed fix it to partially revert this commit by removing the selftests parts.

  [Testcase]
  On a groovy/linux repo:

  $ make -C tools/testing/selftests TARGETS=bpf SKIP_TARGETS=

  [Where problems could occur]
  By removing the selftests we could be introducing a regression with the bpf code change which would be likely unoticed during the tests.

  
  ==== Original Description ====

  Issue found on 5.8.0-1024.26-azure / 5.8.0-1022.23-oracle

  Test failed to build, I didn't see any meaningful error message, this
  might need to be double checked.

      HDRINST usr/include/asm/fcntl.h
      HDRINST usr/include/asm/termbits.h
      HDRINST usr/include/asm/errno.h
      INSTALL ./usr/include
    make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux'
    make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests'
    stderr:
    make: *** [Makefile:159: all] Error 1

  Please find attachment for the complete test log.

  == Process to reproduce this ==
  1. git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/groovy
  2. cd groovy/tools/testing/selftests
  3. make TARGETS=bpf
  You will see the build failed if it's affected by this.

  I think this is affecting the ubuntu_kernel_selftests as well, as the
  net test would require the bpf test to be built first.

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