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[Jürg Häfliger <1753941@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1753941

Title:
  ubuntu_bpf_jit test failed on Bionic s390x systems

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

Bug description:
  == SRU Justification ==
  The ubuntu_bpf_jit test will fail with the following 5 test cases:

  test_bpf: #292 BPF_MAXINSNS: Ctx heavy transformations FAIL to prog_create err=-524 len=4096
  test_bpf: #293 BPF_MAXINSNS: Call heavy transformations FAIL to prog_create err=-524 len=4096
  test_bpf: #298 BPF_MAXINSNS: ld_abs+get_processor_id FAIL to prog_create err=-524 len=4096
  test_bpf: #299 BPF_MAXINSNS: ld_abs+vlan_push/pop FAIL to select_runtime err=-524
  test_bpf: #300 BPF_MAXINSNS: jump around ld_abs FAIL to select_runtime err=-524

  test_bpf: Summary: 337 PASSED, 5 FAILED, [329/329 JIT'ed]

  And modprobe error can be found in the report as well:
  modprobe: ERROR: could not insert 'test_bpf': Invalid argument

  Issue can be reproduce on both zVM and Ubuntu on LPAR s390x systems.

  == Fix ==
  3203c9010060 ("test_bpf: flag tests that cannot be jited on s390")

  A backport of the fix is needed to compile out "BPF_MAXINSNS:
  ld_abs+vlan_push/pop" and "BPF_MAXINSNS: jump around ld_abs'
  testcases. They have been removed from lib/test_bpf.c on 93731ef086ce
  ("bpf: migrate ebpf ld_abs/ld_ind tests to test_verifier"), however,
  backporting this patch would require pulling other patches as prereqs.

  == Regression Potential ==
  None, the fix is in a test module and only masks failing testcases on s390 only.

  == Test Case ==
  Load the test_bpf module, it should load without errors.

  
  Not sure if this is related to bug 1751234 (error on AMD64 system is different)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-11-generic 4.15.0-11.12
  ProcVersionSignature: Ubuntu 4.15.0-11.12-generic 4.15.5
  Uname: Linux 4.15.0-11-generic s390x
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: s390x
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord'
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  CurrentDmesg:

  Date: Wed Mar  7 08:13:51 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
  Lspci:

  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:

  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=/dev/mapper/kl02vg01-root crashkernel=196M BOOT_IMAGE=0
  RelatedPackageVersions:
   linux-restricted-modules-4.15.0-11-generic N/A
   linux-backports-modules-4.15.0-11-generic  N/A
   linux-firmware                             1.172
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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