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Several forwarding tests (e.g., gre_multipath.sh) initialize both IPv4 and IPv6 addresses using simple_if_init, but only clean up IPv4 in simple_if_fini. This leaves stale IPv6 addresses on the interfaces, which causes subsequent tests to fail when they encounter unexpected address configuration. The issue can be reproduced by running tests in sequence: # run_kselftest.sh -t net/forwarding:ipip_hier_gre.sh # run_kselftest.sh -t net/forwarding:min_max_mtu.sh TAP version 13 1..1 # timeout set to 0 # selftests: net/forwarding: min_max_mtu.sh # TEST: ping [ OK ] # TEST: ping6 [ OK ] # TEST: Test maximum MTU configuration [ OK ] # TEST: Test traffic, packet size is maximum MTU [FAIL] # Ping6, packet size: 65487 succeeded, but should have failed # TEST: Test minimum MTU configuration [ OK ] # TEST: Test traffic, packet size is minimum MTU [ OK ] not ok 1 selftests: net/forwarding: min_max_mtu.sh # exit=1 Fix this by removing the unused IPv6 argument from simple_if_init in tests that don't use IPv6 (gre_multipath.sh, ipip_lib.sh), and by adding the missing IPv6 argument to simple_if_fini in tests that use IPv6 (gre_multipath_nh.sh, gre_multipath_nh_res.sh). Signed-off-by: Aleksei Oladko <aleksey.oladko@virtuozzo.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/20260305211000.515301-1-aleksey.oladko@virtuozzo.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>