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[Jürg Häfliger <1829812@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1829812

Title:
  Regression for ubuntu_kernel_selftests [net] ubuntu_bpf test case
  fails to build on disco

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux-aws package in Ubuntu:
  Fix Released
Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux source package in Disco:
  Fix Released
Status in linux-aws source package in Disco:
  Fix Released
Status in linux-azure source package in Disco:
  Fix Released

Bug description:
  [SRU Justification]

  == Impact ==
  Some upstream stable change modified the bpf selftest to use a function that probes for existing eBPF program types. However that function does not exist in the 5.0 kernel sources.

  == Fix ==
  Picking two additional changes from upstream (which only modify the tools sub-directory), allows to compile the selftests again.

  == Risk of Regression ==
  Since the kernel itself is not touched, the risk is low.

  == Testcase ==
  With build-essential installed and the Disco kernel tree cloned:

  cd tools/testing/selftests/
  TARGET=net make

  ---

  This test will failed to build on 5.0.0-16 Disco.

  5.0.0-16 Disco + 5.0.0-15 source code - build OK
  5.0.0-16 Disco + 5.0.0-16 source code - Failed

  Bisect shows this one e38969c9 (selftests/bpf: skip verifier tests for
  unsupported program types) in our tree is the cause (upstream commit:
  8184d44c)

  Which uses a "recently introduced bpf_probe_prog_type()" to skip test.
  And we don't have it implemented.

    make[1]: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf'
    gcc -o /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/urandom_read -static urandom_read.c -Wl,--build-id
    make -C ../../../lib/bpf OUTPUT=/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/
    make[2]: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/lib/bpf'

    Auto-detecting system features:
    ...                        libelf: [ on  ]
    ...                           bpf: [ on  ]

      HOSTCC   /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/fixdep.o
      HOSTLD   /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/fixdep-in.o
      LINK     /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/fixdep
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/libbpf.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/bpf.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/nlattr.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/btf.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/libbpf_errno.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/str_error.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/netlink.o
      CC       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/bpf_prog_linfo.o
      LD       /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/libbpf-in.o
      LINK     /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/libbpf.a
      LINK     /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/libbpf.so
      LINK     /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/test_libbpf
    make[2]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/lib/bpf'
    gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf -I../../../../include/generated  -I../../../include    test_verifier.c /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread -o /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/test_verifier
    make[1]: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf'
    make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests'
    stderr:
    Warning: Kernel ABI header at 'tools/include/uapi/linux/if_link.h' differs from latest version at 'include/uapi/linux/if_link.h'
    test_verifier.c: In function ‘do_test_single’:
    test_verifier.c:15951:22: warning: implicit declaration of function ‘bpf_probe_prog_type’; did you mean ‘bpf_program__set_type’? [-Wimplicit-function-declaration]
      if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
                          ^~~~~~~~~~~~~~~~~~~
                          bpf_program__set_type
    /usr/bin/ld: /tmp/ccRNIovw.o: in function `do_test_single':
    test_verifier.c:(.text+0xf41): undefined reference to `bpf_probe_prog_type'
    collect2: error: ld returned 1 exit status
    make[1]: *** [../lib.mk:152: /home/ubuntu/autotest/client/tmp/ubuntu_bpf/src/linux/tools/testing/selftests/bpf/test_verifier] Error 1
    make: *** [Makefile:90: all] Error 2

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: linux-image-5.0.0-16-generic 5.0.0-16.17
  ProcVersionSignature: User Name 5.0.0-16.17-generic 5.0.8
  Uname: Linux 5.0.0-16-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May 21 04:54 seq
   crw-rw---- 1 root audio 116, 33 May 21 04:54 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
  ApportVersion: 2.20.10-0ubuntu27
  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:
  CurrentDmesg:

  Date: Tue May 21 05:08:27 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-5.0.0-16-generic root=UUID=8595ef43-8a93-42a9-9f7b-92ebcc44df3f ro
  RelatedPackageVersions:
   linux-restricted-modules-5.0.0-16-generic N/A
   linux-backports-modules-5.0.0-16-generic  N/A
   linux-firmware                            1.178.1
  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

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