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[Jürg Häfliger <1953366@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1953366

Title:
  spectre_v2 from ubuntu_kernel_selftests ADT test failure with
  5.13/5.11 ppc64el

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Impish:
  Fix Released
Status in linux source package in Jammy:
  Fix Released

Bug description:
  This is a scripted bug report about ADT failures while running linux
  tests for linux/5.13.0-23.23 on impish. Whether this is caused by the
  dep8 tests of the tested source or the kernel has yet to be
  determined.

  This test was previously being skipped. After recent test changes,
  it's now showing up as a failure. Not a regression.

  ubuntu_kernel_selftests.powerpc/security:spectre_v2 consistently
  failing on 5.13 and 5.11

  Found failing on:
    Impish/linux 5.13.0-23.23
    Hirsute/linux 5.11.0-42.46 (passed on first run, though failing after retrigger)
    Foal/hwe-5.13 5.13.0-23.23~20.04.1
    Focal/hwe-5.11 5.11.0-42.46~20.04.1

  23:45:31 DEBUG| [stdout] # selftests: powerpc/security: spectre_v2
  23:45:31 DEBUG| [stdout] # test: spectre_v2
  23:45:31 DEBUG| [stdout] # tags: git_version:d9c024c2-dirty
  23:45:50 DEBUG| [stdout] # sysfs reports: 'Mitigation: Software count cache flush, Software link stack flush'
  23:45:50 DEBUG| [stdout] #  PM_BR_PRED_CCACHE: result 2147483649 running/enabled 19680067308
  23:45:50 DEBUG| [stdout] # PM_BR_MPRED_CCACHE: result 2147475077 running/enabled 19680064034
  23:45:50 DEBUG| [stdout] #  PM_BR_PRED_PCACHE: result          0 running/enabled 19680062840
  23:45:50 DEBUG| [stdout] # PM_BR_MPRED_PCACHE: result          0 running/enabled 19680061722
  23:45:50 DEBUG| [stdout] # Miss percent 99 %
  23:45:50 DEBUG| [stdout] # Branch misses > 15% unexpected in this configuration!
  23:45:50 DEBUG| [stdout] # Possible mis-match between reported & actual mitigation
  23:45:50 DEBUG| [stdout] # failure: spectre_v2
  23:45:50 DEBUG| [stdout] not ok 1 selftests: powerpc/security: spectre_v2 # exit=1
  23:45:50 DEBUG| [stdout] make: Leaving directory '/tmp/autopkgtest.XkeXuO/build.i7C/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/powerpc/security'

  Testing failed on:
      ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-impish/impish/ppc64el/l/linux/20211204_000820_141a2@/log.gz

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