Hi Dmytro, url: https://github.com/0day-ci/linux/commits/Dmytro-SHYTYI/net-mptcp-Fast-Ope... base: df0cc57e057f18e44dac8e6c18aba47ab53202f9 config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20220117/202201170247.BMTU5XYy-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; smatch warnings: net/ipv4/tcp_input.c:6960 tcp_conn_request() warn: ignoring unreachable code. vim +6960 net/ipv4/tcp_input.c 9caad864151e52 Eric Dumazet 2016-04-01 6951 if (want_cookie) { 9caad864151e52 Eric Dumazet 2016-04-01 6952 reqsk_free(req); 9caad864151e52 Eric Dumazet 2016-04-01 6953 return 0; 9caad864151e52 Eric Dumazet 2016-04-01 6954 } 1fb6f159fd21c6 Octavian Purdila 2014-06-25 6955 } ca6fb06518836e Eric Dumazet 2015-10-02 6956 reqsk_put(req); 1fb6f159fd21c6 Octavian Purdila 2014-06-25 6957 return 0; ^^^^^^^^ 1fb6f159fd21c6 Octavian Purdila 2014-06-25 6958 52c7bf82e2e91e Dmytro SHYTYI 2022-01-16 6959 //drop_and_release: 1fb6f159fd21c6 Octavian Purdila 2014-06-25 @6960 dst_release(dst); ^^^^^^^^^^^^^^^^ Unreachable code. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org