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Even after enabling mtpcp via sysctl command or adding an entry to /etc/sysctl.conf this fails. I don't think this test should be failing and should account for cases where mptcp has not been enabled by default? These are the test logs: $ sudo tools/testing/selftests/bpf/test_progs -t mptcp Can't find bpf_testmod.ko kernel module: -2 WARNING! Selftests relying on bpf_testmod.ko will be skipped. run_test:PASS:bpf_prog_attach 0 nsec run_test:PASS:connect to fd 0 nsec verify_tsk:PASS:bpf_map_lookup_elem 0 nsec verify_tsk:PASS:unexpected invoked count 0 nsec verify_tsk:PASS:unexpected is_mptcp 0 nsec test_base:PASS:run_test tcp 0 nsec (network_helpers.c:107: errno: Protocol not available) Failed to create server socket test_base:FAIL:start_mptcp_server unexpected start_mptcp_server: actual -1 < expected 0 #178/1   mptcp/base:FAIL test_mptcpify:PASS:test__join_cgroup 0 nsec create_netns:PASS:ip netns add mptcp_ns 0 nsec create_netns:PASS:ip -net mptcp_ns link set dev lo up 0 nsec test_mptcpify:PASS:create_netns 0 nsec run_mptcpify:PASS:skel_open_load 0 nsec run_mptcpify:PASS:skel_attach 0 nsec (network_helpers.c:107: errno: Protocol not available) Failed to create server socket run_mptcpify:FAIL:start_server unexpected start_server: actual -1 < expected 0 test_mptcpify:FAIL:run_mptcpify unexpected error: -5 (errno 92) #178/2   mptcp/mptcpify:FAIL #178     mptcp:FAIL All error logs: test_base:PASS:test__join_cgroup 0 nsec create_netns:PASS:ip netns add mptcp_ns 0 nsec create_netns:PASS:ip -net mptcp_ns link set dev lo up 0 nsec test_base:PASS:create_netns 0 nsec test_base:PASS:start_server 0 nsec run_test:PASS:skel_open_load 0 nsec run_test:PASS:skel_attach 0 nsec run_test:PASS:bpf_prog_attach 0 nsec run_test:PASS:connect to fd 0 nsec verify_tsk:PASS:bpf_map_lookup_elem 0 nsec verify_tsk:PASS:unexpected invoked count 0 nsec verify_tsk:PASS:unexpected is_mptcp 0 nsec test_base:PASS:run_test tcp 0 nsec (network_helpers.c:107: errno: Protocol not available) Failed to create server socket test_base:FAIL:start_mptcp_server unexpected start_mptcp_server: actual -1 < expected 0 #178/1   mptcp/base:FAIL test_mptcpify:PASS:test__join_cgroup 0 nsec create_netns:PASS:ip netns add mptcp_ns 0 nsec create_netns:PASS:ip -net mptcp_ns link set dev lo up 0 nsec test_mptcpify:PASS:create_netns 0 nsec run_mptcpify:PASS:skel_open_load 0 nsec run_mptcpify:PASS:skel_attach 0 nsec (network_helpers.c:107: errno: Protocol not available) Failed to create server socket run_mptcpify:FAIL:start_server unexpected start_server: actual -1 < expected 0 test_mptcpify:FAIL:run_mptcpify unexpected error: -5 (errno 92) #178/2   mptcp/mptcpify:FAIL #178     mptcp:FAIL Summary: 0/0 PASSED, 0 SKIPPED, 1 FAILED This is the custom patch I had applied on the LTS v6.12.36 kernel and tested it: diff --git a/net/mptcp/ctrl.c b/net/mptcp/ctrl.c index dd595d9b5e50c..bdcc4136e92ef 100644 --- a/net/mptcp/ctrl.c +++ b/net/mptcp/ctrl.c @@ -89,7 +89,7 @@ const char *mptcp_get_scheduler(const struct net *net) static void mptcp_pernet_set_defaults(struct mptcp_pernet *pernet) { - pernet->mptcp_enabled = 1; + pernet->mptcp_enabled = 0; pernet->add_addr_timeout = TCP_RTO_MAX; pernet->blackhole_timeout = 3600; atomic_set(&pernet->active_disable_times, 0); -- Thanks & Regards, Harshvardhan