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[Jürg Häfliger <1928889@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1928889

Title:
  devlink_port_split in net from ubuntu_kernel_selftests linux ADT test
  failure with linux/5.11.0-18.19 ( list index out of range)

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux-oem-5.10 package in Ubuntu:
  Invalid
Status in linux-oem-5.13 package in Ubuntu:
  Invalid
Status in linux source package in Focal:
  Invalid
Status in linux-oem-5.10 source package in Focal:
  Fix Released
Status in linux-oem-5.13 source package in Focal:
  Fix Released
Status in linux source package in Hirsute:
  Fix Released
Status in linux-oem-5.10 source package in Hirsute:
  Invalid
Status in linux-oem-5.13 source package in Hirsute:
  Invalid
Status in linux source package in Impish:
  Fix Released
Status in linux-oem-5.10 source package in Impish:
  Invalid
Status in linux-oem-5.13 source package in Impish:
  Invalid

Bug description:
  [Impact]
  If there is no devlink device available, the devlink_port_split.py in kselftest/net will fail with:
   # selftests: net: devlink_port_split.py
   # Traceback (most recent call last):
   #   File "/tmp/autopkgtest.ojlWKQ/build.XZw/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 277, in <module>
   #     main()
   #   File "/tmp/autopkgtest.ojlWKQ/build.XZw/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 242, in main
   #     dev = list(devs.keys())[0]
   # IndexError: list index out of range 
   not ok 43 selftests: net: devlink_port_split.py # exit=1

  [Fix]
  * 25173dd4093a24 selftests: net: devlink_port_split.py: skip the test if no devlink device

  This test only exist in our source tree since Hirsute, this patch can
  be cherry-picked into all affected kernels.

  [Test Plan]
  Run this test manually from the patched source tree, the test will be skipped when there is no devlink device:
    # selftests: net: devlink_port_split.py
    # no devlink device was found, test skipped
    ok 7 selftests: net: devlink_port_split.py # SKIP

  [Where problems could occur]
  Change limited to testing tool, if this change is incorrect it might cause false-negative result in our test report.

  
  [Original Bug Report]
  This is a scripted bug report about ADT failures while running linux tests for linux/5.11.0-18.19 on hirsute. Whether this is caused by the dep8 tests of the tested source or the kernel has yet to be determined.

  Not a regression. Found to occur previously on hirsute/linux
  5.11.0-14.15

  Testing failed on:
      amd64: https://autopkgtest.ubuntu.com/results/autopkgtest-hirsute/hirsute/amd64/l/linux/20210515_005957_75e5a@/log.gz
      arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-hirsute/hirsute/arm64/l/linux/20210513_203508_96fd3@/log.gz
      ppc64el: https://autopkgtest.ubuntu.com/results/autopkgtest-hirsute/hirsute/ppc64el/l/linux/20210513_163708_c0203@/log.gz
      s390x: https://autopkgtest.ubuntu.com/results/autopkgtest-hirsute/hirsute/s390x/l/linux/20210513_144454_54b04@/log.gz

  17:39:37 DEBUG| [stdout] # selftests: net: devlink_port_split.py
  17:39:37 DEBUG| [stdout] # Traceback (most recent call last):
  17:39:37 DEBUG| [stdout] #   File "/tmp/autopkgtest.ojlWKQ/build.XZw/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 277, in <module>
  17:39:37 DEBUG| [stdout] #     main()
  17:39:37 DEBUG| [stdout] #   File "/tmp/autopkgtest.ojlWKQ/build.XZw/src/autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/./devlink_port_split.py", line 242, in main
  17:39:37 DEBUG| [stdout] #     dev = list(devs.keys())[0]
  17:39:37 DEBUG| [stdout] # IndexError: list index out of range
  17:39:37 DEBUG| [stdout] not ok 43 selftests: net: devlink_port_split.py # exit=1

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