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[Jürg Häfliger <1854001@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1854001

Title:
  pmtu net kernel selftests are skipped on bionic linux-hwe-edge 5.3

Status in ubuntu-kernel-tests:
  Fix Released
Status in iproute2 package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in iproute2 source package in Bionic:
  Invalid
Status in linux source package in Bionic:
  Won't Fix

Bug description:
  [Impact]
  selftests will incorrectly indicate a failure, taking the time of developers to verify a false positive, and preventing us from finding real bugs in the corresponding code.

  [Test case]
  Run the script directly and verify there are no failures.
  sudo ./tools/testing/selftests/net/pmtu.sh

  [Regression potential]
  No kernel code was changed, only the test. The fix could cause false positives to happen with newer versions of iproute2, but those were tested as well.

  
  ------------------------------------

  11:52:44 DEBUG| [stdout] # selftests: net: pmtu.sh
  11:52:44 DEBUG| [stdout] # TEST: ipv4: PMTU exceptions                                         [ OK ]
  11:52:44 DEBUG| [stdout] # TEST: ipv6: PMTU exceptions                                         [ OK ]
  11:52:44 DEBUG| [stdout] #   vxlan4 not supported
  11:52:44 DEBUG| [stdout] # TEST: IPv4 over vxlan4: PMTU exceptions                             [SKIP]
  11:52:44 DEBUG| [stdout] #   vxlan4 not supported
  11:52:44 DEBUG| [stdout] # TEST: IPv6 over vxlan4: PMTU exceptions                             [SKIP]
  11:52:46 DEBUG| [stdout] # TEST: IPv4 over vxlan6: PMTU exceptions                             [ OK ]
  11:52:47 DEBUG| [stdout] # TEST: IPv6 over vxlan6: PMTU exceptions                             [ OK ]
  11:52:47 DEBUG| [stdout] #   geneve4 not supported
  11:52:47 DEBUG| [stdout] # TEST: IPv4 over geneve4: PMTU exceptions                            [SKIP]
  11:52:47 DEBUG| [stdout] #   geneve4 not supported
  11:52:47 DEBUG| [stdout] # TEST: IPv6 over geneve4: PMTU exceptions                            [SKIP]
  11:52:48 DEBUG| [stdout] # TEST: IPv4 over geneve6: PMTU exceptions                            [ OK ]
  11:52:49 DEBUG| [stdout] # TEST: IPv6 over geneve6: PMTU exceptions                            [ OK ]
  11:52:51 DEBUG| [stdout] # TEST: IPv4 over fou4: PMTU exceptions                               [ OK ]
  11:52:52 DEBUG| [stdout] # TEST: IPv6 over fou4: PMTU exceptions                               [ OK ]
  11:52:53 DEBUG| [stdout] # TEST: IPv4 over fou6: PMTU exceptions                               [ OK ]
  11:52:54 DEBUG| [stdout] # TEST: IPv6 over fou6: PMTU exceptions                               [ OK ]
  11:52:55 DEBUG| [stdout] # TEST: IPv4 over gue4: PMTU exceptions                               [ OK ]
  11:52:57 DEBUG| [stdout] # TEST: IPv6 over gue4: PMTU exceptions                               [ OK ]
  11:52:58 DEBUG| [stdout] # TEST: IPv4 over gue6: PMTU exceptions                               [ OK ]
  11:52:59 DEBUG| [stdout] # TEST: IPv6 over gue6: PMTU exceptions                               [ OK ]
  11:53:00 DEBUG| [stdout] # TEST: vti6: PMTU exceptions                                         [ OK ]
  11:53:03 DEBUG| [stdout] # TEST: vti4: PMTU exceptions                                         [ OK ]
  11:53:03 DEBUG| [stdout] # TEST: vti4: default MTU assignment                                  [ OK ]
  11:53:03 DEBUG| [stdout] # TEST: vti6: default MTU assignment                                  [ OK ]
  11:53:03 DEBUG| [stdout] # TEST: vti4: MTU setting on link creation                            [ OK ]
  11:53:04 DEBUG| [stdout] # TEST: vti6: MTU setting on link creation                            [ OK ]
  11:53:04 DEBUG| [stdout] # TEST: vti6: MTU changes on link changes                             [ OK ]
  11:53:04 DEBUG| [stdout] #   vxlan4 not supported
  11:53:04 DEBUG| [stdout] # TEST: ipv4: cleanup of cached exceptions                            [SKIP]
  ....

  Upgrading iproute2 to 5.2 fixes this.

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