Public bug reported:

Issue found on 5.15.0-36.37

Test failed with:
TEST: IPv6 compat mode on - route add notification                  [FAIL]

Test log:
 # selftests: net: fib_nexthops.sh
 # 
 # Basic functional tests
 # ----------------------
 # TEST: List with nothing defined                                     [ OK ]
 # TEST: Nexthop get on non-existent id                                [ OK ]
 # TEST: Nexthop with no device or gateway                             [ OK ]
 # TEST: Nexthop with down device                                      [ OK ]
 # TEST: Nexthop with device that is linkdown                          [ OK ]
 # TEST: Nexthop with device only                                      [ OK ]
 # TEST: Nexthop with duplicate id                                     [ OK ]
 # TEST: Blackhole nexthop                                             [ OK ]
 # TEST: Blackhole nexthop with other attributes                       [ OK ]
 # TEST: Blackhole nexthop with loopback device down                   [ OK ]
 # TEST: Create group                                                  [ OK ]
 # TEST: Create group with blackhole nexthop                           [ OK ]
 # TEST: Create multipath group where 1 path is a blackhole            [ OK ]
 # TEST: Multipath group can not have a member replaced by blackhole   [ OK ]
 # TEST: Create group with non-existent nexthop                        [ OK ]
 # TEST: Create group with same nexthop multiple times                 [ OK ]
 # TEST: Replace nexthop with nexthop group                            [ OK ]
 # TEST: Replace nexthop group with nexthop                            [ OK ]
 # TEST: Nexthop group and device                                      [ OK ]
 # TEST: Test proto flush                                              [ OK ]
 # TEST: Nexthop group and blackhole                                   [ OK ]
 # TEST: Large scale nexthop flushing                                  [ OK ]
 # 
 # Basic resilient nexthop group functional tests
 # ----------------------------------------------
 # TEST: Add a nexthop group with default parameters                   [ OK ]
 # TEST: Get a nexthop group with default parameters                   [ OK ]
 # TEST: Get a nexthop group with non-default parameters               [ OK ]
 # TEST: Add a nexthop group with 0 buckets                            [ OK ]
 # TEST: Replace nexthop group parameters                              [ OK ]
 # TEST: Get a nexthop group after replacing parameters                [ OK ]
 # TEST: Replace idle timer                                            [ OK ]
 # TEST: Get a nexthop group after replacing idle timer                [ OK ]
 # TEST: Replace unbalanced timer                                      [ OK ]
 # TEST: Get a nexthop group after replacing unbalanced timer          [ OK ]
 # TEST: Replace with no parameters                                    [ OK ]
 # TEST: Get a nexthop group after replacing no parameters             [ OK ]
 # TEST: Replace nexthop group type - implicit                         [ OK ]
 # TEST: Replace nexthop group type - explicit                         [ OK ]
 # TEST: Replace number of nexthop buckets                             [ OK ]
 # TEST: Get a nexthop group after replacing with invalid parameters   [ OK ]
 # TEST: Dump all nexthop buckets                                      [ OK ]
 # TEST: Dump all nexthop buckets in a group                           [ OK ]
 # TEST: All nexthop buckets report a positive near-zero idle time     [ OK ]
 # TEST: Dump all nexthop buckets with a specific nexthop device       [ OK ]
 # TEST: Dump all nexthop buckets with a specific nexthop identifier   [ OK ]
 # TEST: Dump all nexthop buckets in a non-existent group              [ OK ]
 # TEST: Dump all nexthop buckets in a non-resilient group             [ OK ]
 # TEST: Dump all nexthop buckets using a non-existent device          [ OK ]
 # TEST: Dump all nexthop buckets with invalid 'groups' keyword        [ OK ]
 # TEST: Dump all nexthop buckets with invalid 'fdb' keyword           [ OK ]
 # TEST: Get a valid nexthop bucket                                    [ OK ]
 # TEST: Get a nexthop bucket with valid group, but invalid index      [ OK ]
 # TEST: Get a nexthop bucket from a non-resilient group               [ OK ]
 # TEST: Get a nexthop bucket from a non-existent group                [ OK ]
 # TEST: Initial bucket allocation                                     [ OK ]
 # TEST: Bucket allocation after replace                               [ OK ]
 # TEST: Buckets migrated after idle timer change                      [ OK ]
 # 
 # IPv4 functional
 # ----------------------
 # TEST: Create nexthop with id, gw, dev                               [ OK ]
 # TEST: Get nexthop by id                                             [ OK ]
 # TEST: Delete nexthop by id                                          [ OK ]
 # TEST: Create nexthop - gw only                                      [ OK ]
 # TEST: Create nexthop - invalid gw+dev combination                   [ OK ]
 # TEST: Create nexthop - gw+dev and onlink                            [ OK ]
 # TEST: Nexthops removed on admin down                                [ OK ]
 # 
 # IPv4 groups functional
 # ----------------------
 # TEST: Create nexthop group with single nexthop                      [ OK ]
 # TEST: Get nexthop group by id                                       [ OK ]
 # TEST: Delete nexthop group by id                                    [ OK ]
 # TEST: Nexthop group with multiple nexthops                          [ OK ]
 # TEST: Nexthop group updated when entry is deleted                   [ OK ]
 # TEST: Nexthop group with weighted nexthops                          [ OK ]
 # TEST: Weighted nexthop group updated when entry is deleted          [ OK ]
 # TEST: Nexthops in groups removed on admin down                      [ OK ]
 # TEST: Multiple groups with same nexthop                             [ OK ]
 # TEST: Nexthops in group removed on admin down - mixed group         [ OK ]
 # TEST: Nexthop group can not have a group as an entry                [ OK ]
 # TEST: Nexthop group with a blackhole entry                          [ OK ]
 # TEST: Nexthop group can not have a blackhole and another nexthop    [ OK ]
 # 
 # IPv4 resilient groups functional
 # --------------------------------
 # TEST: Nexthop group updated when entry is deleted                   [ OK ]
 # TEST: Nexthop buckets updated when entry is deleted                 [ OK ]
 # TEST: Nexthop group updated after replace                           [ OK ]
 # TEST: Nexthop buckets updated after replace                         [ OK ]
 # TEST: Nexthop group updated when entry is deleted - nECMP           [ OK ]
 # TEST: Nexthop buckets updated when entry is deleted - nECMP         [ OK ]
 # TEST: Nexthop group updated after replace - nECMP                   [ OK ]
 # TEST: Nexthop buckets updated after replace - nECMP                 [ OK ]
 # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
 # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
 # TEST: IPv4 route with IPv6 gateway                                  [ OK ]
 # TEST: IPv4 route with invalid IPv6 gateway                          [ OK ]
 # 
 # IPv4 functional runtime
 # -----------------------
 # TEST: Route add                                                     [ OK ]
 # TEST: Route delete                                                  [ OK ]
 # TEST: Route add - scope conflict with nexthop                       [ OK ]
 # TEST: Nexthop replace with invalid scope for existing route         [ OK ]
 # TEST: IPv4 route with invalid metric                                [ OK ]
 # TEST: Basic ping                                                    [ OK ]
 # TEST: Ping - multipath                                              [ OK ]
 # TEST: Ping - multiple default routes, nh first                      [ OK ]
 # TEST: Ping - multiple default routes, nh second                     [ OK ]
 # TEST: Ping - blackhole                                              [ OK ]
 # TEST: Ping - blackhole replaced with gateway                        [ OK ]
 # TEST: Ping - gateway replaced by blackhole                          [ OK ]
 # TEST: Ping - group with blackhole                                   [ OK ]
 # TEST: Ping - group blackhole replaced with gateways                 [ OK ]
 # TEST: IPv4 route with device only nexthop                           [ OK ]
 # TEST: IPv4 multipath route with nexthop mix - dev only + gw         [ OK ]
 # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
 # TEST: IPv4 route with mixed v4-v6 multipath route                   [ OK ]
 # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
 # TEST: IPv4 route with IPv6 gateway                                  [ OK ]
 # TEST: IPv4 default route with IPv6 gateway                          [ OK ]
 # TEST: IPv4 route with MPLS encap                                    [ OK ]
 # TEST: IPv4 route with MPLS encap - check                            [ OK ]
 # TEST: IPv4 route with MPLS encap and v6 gateway                     [ OK ]
 # TEST: IPv4 route with MPLS encap, v6 gw - check                     [ OK ]
 # 
 # IPv4 large groups (x32)
 # ---------------------
 # TEST: Dump large (x32) ecmp groups                                  [ OK ]
 # 
 # IPv4 large resilient group (128k buckets)
 # -----------------------------------------
 # TEST: Dump large (x131072) nexthop buckets                          [ OK ]
 # 
 # IPv4 nexthop api compat mode
 # ----------------------------
 # TEST: IPv4 default nexthop compat mode check                        [ OK ]
 # TEST: IPv4 compat mode on - route add notification                  [ OK ]
 # TEST: IPv4 compat mode on - route dump                              [ OK ]
 # TEST: IPv4 compat mode on - nexthop change                          [ OK ]
 # TEST: IPv4 set compat mode - 0                                      [ OK ]
 # TEST: IPv4 compat mode off - route add notification                 [ OK ]
 # TEST: IPv4 compat mode off - route dump                             [ OK ]
 # TEST: IPv4 compat mode off - nexthop change                         [ OK ]
 # TEST: IPv4 compat mode off - nexthop delete                         [ OK ]
 # TEST: IPv4 set compat mode - 1                                      [ OK ]
 # 
 # IPv4 fdb groups functional
 # --------------------------
 # TEST: Fdb Nexthop group with multiple nexthops                      [ OK ]
 # TEST: Get Fdb nexthop group by id                                   [ OK ]
 # TEST: Fdb Nexthop group with non-fdb nexthops                       [ OK ]
 # TEST: Non-Fdb Nexthop group with fdb nexthops                       [ OK ]
 # TEST: Fdb Nexthop with blackhole                                    [ OK ]
 # TEST: Fdb Nexthop with oif                                          [ OK ]
 # TEST: Fdb Nexthop with onlink                                       [ OK ]
 # TEST: Fdb Nexthop with encap                                        [ OK ]
 # TEST: Fdb mac add with nexthop group                                [ OK ]
 # TEST: Fdb mac add with nexthop                                      [ OK ]
 # TEST: Route add with fdb nexthop                                    [ OK ]
 # TEST: Route add with fdb nexthop group                              [ OK ]
 # TEST: Fdb entry after deleting a single nexthop                     [ OK ]
 # TEST: Fdb nexthop delete                                            [ OK ]
 # TEST: Fdb entry after deleting a nexthop group                      [ OK ]
 # 
 # IPv4 runtime torture
 # --------------------
 # TEST: IPv4 torture test                                             [ OK ]
 # 
 # IPv4 runtime resilient nexthop group torture
 # --------------------------------------------
 # TEST: IPv4 resilient nexthop group torture test                     [ OK ]
 # 
 # IPv6
 # ----------------------
 # TEST: Create nexthop with id, gw, dev                               [ OK ]
 # TEST: Get nexthop by id                                             [ OK ]
 # TEST: Delete nexthop by id                                          [ OK ]
 # TEST: Create nexthop - gw only                                      [ OK ]
 # TEST: Create nexthop - invalid gw+dev combination                   [ OK ]
 # TEST: Create nexthop - gw+dev and onlink                            [ OK ]
 # TEST: Nexthops removed on admin down                                [ OK ]
 # 
 # IPv6 groups functional
 # ----------------------
 # TEST: Create nexthop group with single nexthop                      [ OK ]
 # TEST: Get nexthop group by id                                       [ OK ]
 # TEST: Delete nexthop group by id                                    [ OK ]
 # TEST: Nexthop group with multiple nexthops                          [ OK ]
 # TEST: Nexthop group updated when entry is deleted                   [ OK ]
 # TEST: Nexthop group with weighted nexthops                          [ OK ]
 # TEST: Weighted nexthop group updated when entry is deleted          [ OK ]
 # TEST: Nexthops in groups removed on admin down                      [ OK ]
 # TEST: Multiple groups with same nexthop                             [ OK ]
 # TEST: Nexthops in group removed on admin down - mixed group         [ OK ]
 # TEST: Nexthop group can not have a group as an entry                [ OK ]
 # TEST: Nexthop group with a blackhole entry                          [ OK ]
 # TEST: Nexthop group can not have a blackhole and another nexthop    [ OK ]
 # 
 # IPv6 resilient groups functional
 # --------------------------------
 # TEST: Nexthop group updated when entry is deleted                   [ OK ]
 # TEST: Nexthop buckets updated when entry is deleted                 [ OK ]
 # TEST: Nexthop group updated after replace                           [ OK ]
 # TEST: Nexthop buckets updated after replace                         [ OK ]
 # TEST: Nexthop group updated when entry is deleted - nECMP           [ OK ]
 # TEST: Nexthop buckets updated when entry is deleted - nECMP         [ OK ]
 # TEST: Nexthop group updated after replace - nECMP                   [ OK ]
 # TEST: Nexthop buckets updated after replace - nECMP                 [ OK ]
 # 
 # IPv6 functional runtime
 # -----------------------
 # TEST: Route add                                                     [ OK ]
 # TEST: Route delete                                                  [ OK ]
 # TEST: Ping with nexthop                                             [ OK ]
 # TEST: Ping - multipath                                              [ OK ]
 # TEST: Ping - blackhole                                              [ OK ]
 # TEST: Ping - blackhole replaced with gateway                        [ OK ]
 # TEST: Ping - gateway replaced by blackhole                          [ OK ]
 # TEST: Ping - group with blackhole                                   [ OK ]
 # TEST: Ping - group blackhole replaced with gateways                 [ OK ]
 # TEST: IPv6 route with device only nexthop                           [ OK ]
 # TEST: IPv6 multipath route with nexthop mix - dev only + gw         [ OK ]
 # TEST: IPv6 route can not have a v4 gateway                          [ OK ]
 # TEST: Nexthop replace - v6 route, v4 nexthop                        [ OK ]
 # TEST: Nexthop replace of group entry - v6 route, v4 nexthop         [ OK ]
 # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
 # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
 # TEST: IPv6 route using a group after removing v4 gateways           [ OK ]
 # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
 # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
 # TEST: IPv6 route using a group after replacing v4 gateways          [ OK ]
 # TEST: IPv6 route can not use src routing with external nexthop      [ OK ]
 # TEST: IPv6 route with invalid metric                                [ OK ]
 # TEST: Nexthop with default route and rpfilter                       [ OK ]
 # TEST: Nexthop with multipath default route and rpfilter             [ OK ]
 # 
 # IPv6 large groups (x32)
 # ---------------------
 # TEST: Dump large (x32) ecmp groups                                  [ OK ]
 # 
 # IPv6 large resilient group (128k buckets)
 # -----------------------------------------
 # TEST: Dump large (x131072) nexthop buckets                          [ OK ]
 # 
 # IPv6 nexthop api compat mode test
 # --------------------------------
 # TEST: IPv6 default nexthop compat mode check                        [ OK ]
 # TEST: IPv6 compat mode on - route add notification                  [FAIL]
 # TEST: IPv6 compat mode on - route dump                              [ OK ]
 # TEST: IPv6 compat mode on - nexthop change                          [ OK ]
 # TEST: IPv6 set compat mode - 0                                      [ OK ]
 # TEST: IPv6 compat mode off - route add notification                 [ OK ]
 # TEST: IPv6 compat mode off - route dump                             [ OK ]
 # TEST: IPv6 compat mode off - nexthop change                         [ OK ]
 # TEST: IPv6 compat mode off - nexthop delete                         [ OK ]
 # TEST: IPv6 set compat mode - 1                                      [ OK ]
 # 
 # IPv6 fdb groups functional
 # --------------------------
 # TEST: Fdb Nexthop group with multiple nexthops                      [ OK ]
 # TEST: Get Fdb nexthop group by id                                   [ OK ]
 # TEST: Fdb Nexthop group with non-fdb nexthops                       [ OK ]
 # TEST: Non-Fdb Nexthop group with fdb nexthops                       [ OK ]
 # TEST: Fdb Nexthop with blackhole                                    [ OK ]
 # TEST: Fdb Nexthop with oif                                          [ OK ]
 # TEST: Fdb Nexthop with onlink                                       [ OK ]
 # TEST: Fdb Nexthop with encap                                        [ OK ]
 # TEST: Fdb mac add with nexthop group                                [ OK ]
 # TEST: Fdb mac add with nexthop                                      [ OK ]
 # TEST: Route add with fdb nexthop                                    [ OK ]
 # TEST: Route add with fdb nexthop group                              [ OK ]
 # TEST: Fdb entry after deleting a single nexthop                     [ OK ]
 # TEST: Fdb nexthop delete                                            [ OK ]
 # TEST: Fdb entry after deleting a nexthop group                      [ OK ]
 # 
 # IPv6 runtime torture
 # --------------------
 # TEST: IPv6 torture test                                             [ OK ]
 # 
 # IPv6 runtime resilient nexthop group torture
 # --------------------------------------------
 # TEST: IPv6 resilient nexthop group torture test                     [ OK ]
 # 
 # Tests passed: 221
 # Tests failed:   1
 not ok 1 selftests: net: fib_nexthops.sh # exit=1


This is not a regression, I can see this with 5.15.0-28.29 as well.

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Jammy)
     Importance: Undecided
         Status: New

** Also affects: linux (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Jammy)
   Importance: Undecided
       Status: New

-- 
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https://bugs.launchpad.net/bugs/1977898

Title:
  net:fib_nexthops.sh in ubuntu_kernel_selftests failed on J-5.15 P9
  (TEST: IPv6 compat mode off - route add notification)

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  New
Status in linux source package in Jammy:
  New

Bug description:
  Issue found on 5.15.0-36.37

  Test failed with:
  TEST: IPv6 compat mode on - route add notification                  [FAIL]

  Test log:
   # selftests: net: fib_nexthops.sh
   # 
   # Basic functional tests
   # ----------------------
   # TEST: List with nothing defined                                     [ OK ]
   # TEST: Nexthop get on non-existent id                                [ OK ]
   # TEST: Nexthop with no device or gateway                             [ OK ]
   # TEST: Nexthop with down device                                      [ OK ]
   # TEST: Nexthop with device that is linkdown                          [ OK ]
   # TEST: Nexthop with device only                                      [ OK ]
   # TEST: Nexthop with duplicate id                                     [ OK ]
   # TEST: Blackhole nexthop                                             [ OK ]
   # TEST: Blackhole nexthop with other attributes                       [ OK ]
   # TEST: Blackhole nexthop with loopback device down                   [ OK ]
   # TEST: Create group                                                  [ OK ]
   # TEST: Create group with blackhole nexthop                           [ OK ]
   # TEST: Create multipath group where 1 path is a blackhole            [ OK ]
   # TEST: Multipath group can not have a member replaced by blackhole   [ OK ]
   # TEST: Create group with non-existent nexthop                        [ OK ]
   # TEST: Create group with same nexthop multiple times                 [ OK ]
   # TEST: Replace nexthop with nexthop group                            [ OK ]
   # TEST: Replace nexthop group with nexthop                            [ OK ]
   # TEST: Nexthop group and device                                      [ OK ]
   # TEST: Test proto flush                                              [ OK ]
   # TEST: Nexthop group and blackhole                                   [ OK ]
   # TEST: Large scale nexthop flushing                                  [ OK ]
   # 
   # Basic resilient nexthop group functional tests
   # ----------------------------------------------
   # TEST: Add a nexthop group with default parameters                   [ OK ]
   # TEST: Get a nexthop group with default parameters                   [ OK ]
   # TEST: Get a nexthop group with non-default parameters               [ OK ]
   # TEST: Add a nexthop group with 0 buckets                            [ OK ]
   # TEST: Replace nexthop group parameters                              [ OK ]
   # TEST: Get a nexthop group after replacing parameters                [ OK ]
   # TEST: Replace idle timer                                            [ OK ]
   # TEST: Get a nexthop group after replacing idle timer                [ OK ]
   # TEST: Replace unbalanced timer                                      [ OK ]
   # TEST: Get a nexthop group after replacing unbalanced timer          [ OK ]
   # TEST: Replace with no parameters                                    [ OK ]
   # TEST: Get a nexthop group after replacing no parameters             [ OK ]
   # TEST: Replace nexthop group type - implicit                         [ OK ]
   # TEST: Replace nexthop group type - explicit                         [ OK ]
   # TEST: Replace number of nexthop buckets                             [ OK ]
   # TEST: Get a nexthop group after replacing with invalid parameters   [ OK ]
   # TEST: Dump all nexthop buckets                                      [ OK ]
   # TEST: Dump all nexthop buckets in a group                           [ OK ]
   # TEST: All nexthop buckets report a positive near-zero idle time     [ OK ]
   # TEST: Dump all nexthop buckets with a specific nexthop device       [ OK ]
   # TEST: Dump all nexthop buckets with a specific nexthop identifier   [ OK ]
   # TEST: Dump all nexthop buckets in a non-existent group              [ OK ]
   # TEST: Dump all nexthop buckets in a non-resilient group             [ OK ]
   # TEST: Dump all nexthop buckets using a non-existent device          [ OK ]
   # TEST: Dump all nexthop buckets with invalid 'groups' keyword        [ OK ]
   # TEST: Dump all nexthop buckets with invalid 'fdb' keyword           [ OK ]
   # TEST: Get a valid nexthop bucket                                    [ OK ]
   # TEST: Get a nexthop bucket with valid group, but invalid index      [ OK ]
   # TEST: Get a nexthop bucket from a non-resilient group               [ OK ]
   # TEST: Get a nexthop bucket from a non-existent group                [ OK ]
   # TEST: Initial bucket allocation                                     [ OK ]
   # TEST: Bucket allocation after replace                               [ OK ]
   # TEST: Buckets migrated after idle timer change                      [ OK ]
   # 
   # IPv4 functional
   # ----------------------
   # TEST: Create nexthop with id, gw, dev                               [ OK ]
   # TEST: Get nexthop by id                                             [ OK ]
   # TEST: Delete nexthop by id                                          [ OK ]
   # TEST: Create nexthop - gw only                                      [ OK ]
   # TEST: Create nexthop - invalid gw+dev combination                   [ OK ]
   # TEST: Create nexthop - gw+dev and onlink                            [ OK ]
   # TEST: Nexthops removed on admin down                                [ OK ]
   # 
   # IPv4 groups functional
   # ----------------------
   # TEST: Create nexthop group with single nexthop                      [ OK ]
   # TEST: Get nexthop group by id                                       [ OK ]
   # TEST: Delete nexthop group by id                                    [ OK ]
   # TEST: Nexthop group with multiple nexthops                          [ OK ]
   # TEST: Nexthop group updated when entry is deleted                   [ OK ]
   # TEST: Nexthop group with weighted nexthops                          [ OK ]
   # TEST: Weighted nexthop group updated when entry is deleted          [ OK ]
   # TEST: Nexthops in groups removed on admin down                      [ OK ]
   # TEST: Multiple groups with same nexthop                             [ OK ]
   # TEST: Nexthops in group removed on admin down - mixed group         [ OK ]
   # TEST: Nexthop group can not have a group as an entry                [ OK ]
   # TEST: Nexthop group with a blackhole entry                          [ OK ]
   # TEST: Nexthop group can not have a blackhole and another nexthop    [ OK ]
   # 
   # IPv4 resilient groups functional
   # --------------------------------
   # TEST: Nexthop group updated when entry is deleted                   [ OK ]
   # TEST: Nexthop buckets updated when entry is deleted                 [ OK ]
   # TEST: Nexthop group updated after replace                           [ OK ]
   # TEST: Nexthop buckets updated after replace                         [ OK ]
   # TEST: Nexthop group updated when entry is deleted - nECMP           [ OK ]
   # TEST: Nexthop buckets updated when entry is deleted - nECMP         [ OK ]
   # TEST: Nexthop group updated after replace - nECMP                   [ OK ]
   # TEST: Nexthop buckets updated after replace - nECMP                 [ OK ]
   # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
   # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
   # TEST: IPv4 route with IPv6 gateway                                  [ OK ]
   # TEST: IPv4 route with invalid IPv6 gateway                          [ OK ]
   # 
   # IPv4 functional runtime
   # -----------------------
   # TEST: Route add                                                     [ OK ]
   # TEST: Route delete                                                  [ OK ]
   # TEST: Route add - scope conflict with nexthop                       [ OK ]
   # TEST: Nexthop replace with invalid scope for existing route         [ OK ]
   # TEST: IPv4 route with invalid metric                                [ OK ]
   # TEST: Basic ping                                                    [ OK ]
   # TEST: Ping - multipath                                              [ OK ]
   # TEST: Ping - multiple default routes, nh first                      [ OK ]
   # TEST: Ping - multiple default routes, nh second                     [ OK ]
   # TEST: Ping - blackhole                                              [ OK ]
   # TEST: Ping - blackhole replaced with gateway                        [ OK ]
   # TEST: Ping - gateway replaced by blackhole                          [ OK ]
   # TEST: Ping - group with blackhole                                   [ OK ]
   # TEST: Ping - group blackhole replaced with gateways                 [ OK ]
   # TEST: IPv4 route with device only nexthop                           [ OK ]
   # TEST: IPv4 multipath route with nexthop mix - dev only + gw         [ OK ]
   # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
   # TEST: IPv4 route with mixed v4-v6 multipath route                   [ OK ]
   # TEST: IPv6 nexthop with IPv4 route                                  [ OK ]
   # TEST: IPv4 route with IPv6 gateway                                  [ OK ]
   # TEST: IPv4 default route with IPv6 gateway                          [ OK ]
   # TEST: IPv4 route with MPLS encap                                    [ OK ]
   # TEST: IPv4 route with MPLS encap - check                            [ OK ]
   # TEST: IPv4 route with MPLS encap and v6 gateway                     [ OK ]
   # TEST: IPv4 route with MPLS encap, v6 gw - check                     [ OK ]
   # 
   # IPv4 large groups (x32)
   # ---------------------
   # TEST: Dump large (x32) ecmp groups                                  [ OK ]
   # 
   # IPv4 large resilient group (128k buckets)
   # -----------------------------------------
   # TEST: Dump large (x131072) nexthop buckets                          [ OK ]
   # 
   # IPv4 nexthop api compat mode
   # ----------------------------
   # TEST: IPv4 default nexthop compat mode check                        [ OK ]
   # TEST: IPv4 compat mode on - route add notification                  [ OK ]
   # TEST: IPv4 compat mode on - route dump                              [ OK ]
   # TEST: IPv4 compat mode on - nexthop change                          [ OK ]
   # TEST: IPv4 set compat mode - 0                                      [ OK ]
   # TEST: IPv4 compat mode off - route add notification                 [ OK ]
   # TEST: IPv4 compat mode off - route dump                             [ OK ]
   # TEST: IPv4 compat mode off - nexthop change                         [ OK ]
   # TEST: IPv4 compat mode off - nexthop delete                         [ OK ]
   # TEST: IPv4 set compat mode - 1                                      [ OK ]
   # 
   # IPv4 fdb groups functional
   # --------------------------
   # TEST: Fdb Nexthop group with multiple nexthops                      [ OK ]
   # TEST: Get Fdb nexthop group by id                                   [ OK ]
   # TEST: Fdb Nexthop group with non-fdb nexthops                       [ OK ]
   # TEST: Non-Fdb Nexthop group with fdb nexthops                       [ OK ]
   # TEST: Fdb Nexthop with blackhole                                    [ OK ]
   # TEST: Fdb Nexthop with oif                                          [ OK ]
   # TEST: Fdb Nexthop with onlink                                       [ OK ]
   # TEST: Fdb Nexthop with encap                                        [ OK ]
   # TEST: Fdb mac add with nexthop group                                [ OK ]
   # TEST: Fdb mac add with nexthop                                      [ OK ]
   # TEST: Route add with fdb nexthop                                    [ OK ]
   # TEST: Route add with fdb nexthop group                              [ OK ]
   # TEST: Fdb entry after deleting a single nexthop                     [ OK ]
   # TEST: Fdb nexthop delete                                            [ OK ]
   # TEST: Fdb entry after deleting a nexthop group                      [ OK ]
   # 
   # IPv4 runtime torture
   # --------------------
   # TEST: IPv4 torture test                                             [ OK ]
   # 
   # IPv4 runtime resilient nexthop group torture
   # --------------------------------------------
   # TEST: IPv4 resilient nexthop group torture test                     [ OK ]
   # 
   # IPv6
   # ----------------------
   # TEST: Create nexthop with id, gw, dev                               [ OK ]
   # TEST: Get nexthop by id                                             [ OK ]
   # TEST: Delete nexthop by id                                          [ OK ]
   # TEST: Create nexthop - gw only                                      [ OK ]
   # TEST: Create nexthop - invalid gw+dev combination                   [ OK ]
   # TEST: Create nexthop - gw+dev and onlink                            [ OK ]
   # TEST: Nexthops removed on admin down                                [ OK ]
   # 
   # IPv6 groups functional
   # ----------------------
   # TEST: Create nexthop group with single nexthop                      [ OK ]
   # TEST: Get nexthop group by id                                       [ OK ]
   # TEST: Delete nexthop group by id                                    [ OK ]
   # TEST: Nexthop group with multiple nexthops                          [ OK ]
   # TEST: Nexthop group updated when entry is deleted                   [ OK ]
   # TEST: Nexthop group with weighted nexthops                          [ OK ]
   # TEST: Weighted nexthop group updated when entry is deleted          [ OK ]
   # TEST: Nexthops in groups removed on admin down                      [ OK ]
   # TEST: Multiple groups with same nexthop                             [ OK ]
   # TEST: Nexthops in group removed on admin down - mixed group         [ OK ]
   # TEST: Nexthop group can not have a group as an entry                [ OK ]
   # TEST: Nexthop group with a blackhole entry                          [ OK ]
   # TEST: Nexthop group can not have a blackhole and another nexthop    [ OK ]
   # 
   # IPv6 resilient groups functional
   # --------------------------------
   # TEST: Nexthop group updated when entry is deleted                   [ OK ]
   # TEST: Nexthop buckets updated when entry is deleted                 [ OK ]
   # TEST: Nexthop group updated after replace                           [ OK ]
   # TEST: Nexthop buckets updated after replace                         [ OK ]
   # TEST: Nexthop group updated when entry is deleted - nECMP           [ OK ]
   # TEST: Nexthop buckets updated when entry is deleted - nECMP         [ OK ]
   # TEST: Nexthop group updated after replace - nECMP                   [ OK ]
   # TEST: Nexthop buckets updated after replace - nECMP                 [ OK ]
   # 
   # IPv6 functional runtime
   # -----------------------
   # TEST: Route add                                                     [ OK ]
   # TEST: Route delete                                                  [ OK ]
   # TEST: Ping with nexthop                                             [ OK ]
   # TEST: Ping - multipath                                              [ OK ]
   # TEST: Ping - blackhole                                              [ OK ]
   # TEST: Ping - blackhole replaced with gateway                        [ OK ]
   # TEST: Ping - gateway replaced by blackhole                          [ OK ]
   # TEST: Ping - group with blackhole                                   [ OK ]
   # TEST: Ping - group blackhole replaced with gateways                 [ OK ]
   # TEST: IPv6 route with device only nexthop                           [ OK ]
   # TEST: IPv6 multipath route with nexthop mix - dev only + gw         [ OK ]
   # TEST: IPv6 route can not have a v4 gateway                          [ OK ]
   # TEST: Nexthop replace - v6 route, v4 nexthop                        [ OK ]
   # TEST: Nexthop replace of group entry - v6 route, v4 nexthop         [ OK ]
   # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
   # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
   # TEST: IPv6 route using a group after removing v4 gateways           [ OK ]
   # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
   # TEST: IPv6 route can not have a group with v4 and v6 gateways       [ OK ]
   # TEST: IPv6 route using a group after replacing v4 gateways          [ OK ]
   # TEST: IPv6 route can not use src routing with external nexthop      [ OK ]
   # TEST: IPv6 route with invalid metric                                [ OK ]
   # TEST: Nexthop with default route and rpfilter                       [ OK ]
   # TEST: Nexthop with multipath default route and rpfilter             [ OK ]
   # 
   # IPv6 large groups (x32)
   # ---------------------
   # TEST: Dump large (x32) ecmp groups                                  [ OK ]
   # 
   # IPv6 large resilient group (128k buckets)
   # -----------------------------------------
   # TEST: Dump large (x131072) nexthop buckets                          [ OK ]
   # 
   # IPv6 nexthop api compat mode test
   # --------------------------------
   # TEST: IPv6 default nexthop compat mode check                        [ OK ]
   # TEST: IPv6 compat mode on - route add notification                  [FAIL]
   # TEST: IPv6 compat mode on - route dump                              [ OK ]
   # TEST: IPv6 compat mode on - nexthop change                          [ OK ]
   # TEST: IPv6 set compat mode - 0                                      [ OK ]
   # TEST: IPv6 compat mode off - route add notification                 [ OK ]
   # TEST: IPv6 compat mode off - route dump                             [ OK ]
   # TEST: IPv6 compat mode off - nexthop change                         [ OK ]
   # TEST: IPv6 compat mode off - nexthop delete                         [ OK ]
   # TEST: IPv6 set compat mode - 1                                      [ OK ]
   # 
   # IPv6 fdb groups functional
   # --------------------------
   # TEST: Fdb Nexthop group with multiple nexthops                      [ OK ]
   # TEST: Get Fdb nexthop group by id                                   [ OK ]
   # TEST: Fdb Nexthop group with non-fdb nexthops                       [ OK ]
   # TEST: Non-Fdb Nexthop group with fdb nexthops                       [ OK ]
   # TEST: Fdb Nexthop with blackhole                                    [ OK ]
   # TEST: Fdb Nexthop with oif                                          [ OK ]
   # TEST: Fdb Nexthop with onlink                                       [ OK ]
   # TEST: Fdb Nexthop with encap                                        [ OK ]
   # TEST: Fdb mac add with nexthop group                                [ OK ]
   # TEST: Fdb mac add with nexthop                                      [ OK ]
   # TEST: Route add with fdb nexthop                                    [ OK ]
   # TEST: Route add with fdb nexthop group                              [ OK ]
   # TEST: Fdb entry after deleting a single nexthop                     [ OK ]
   # TEST: Fdb nexthop delete                                            [ OK ]
   # TEST: Fdb entry after deleting a nexthop group                      [ OK ]
   # 
   # IPv6 runtime torture
   # --------------------
   # TEST: IPv6 torture test                                             [ OK ]
   # 
   # IPv6 runtime resilient nexthop group torture
   # --------------------------------------------
   # TEST: IPv6 resilient nexthop group torture test                     [ OK ]
   # 
   # Tests passed: 221
   # Tests failed:   1
   not ok 1 selftests: net: fib_nexthops.sh # exit=1

  
  This is not a regression, I can see this with 5.15.0-28.29 as well.

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