Hi Paolo, url: https://github.com/0day-ci/linux/commits/Paolo-Abeni/mptcp-refactor-activ... base: https://github.com/multipath-tcp/mptcp_net-next.git export config: x86_64-randconfig-m001-20210713 (attached as .config) 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; New smatch warnings: net/mptcp/pm_netlink.c:931 mptcp_pm_nl_subflow_chk_stale() error: uninitialized symbol 'push'. vim +/push +931 net/mptcp/pm_netlink.c bc57ec20ec19b4d Paolo Abeni 2021-07-13 904 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk) bc57ec20ec19b4d Paolo Abeni 2021-07-13 905 { bc57ec20ec19b4d Paolo Abeni 2021-07-13 906 struct mptcp_subflow_context *iter, *subflow = mptcp_subflow_ctx(ssk); bc57ec20ec19b4d Paolo Abeni 2021-07-13 907 struct sock *sk = (struct sock *)msk; bc57ec20ec19b4d Paolo Abeni 2021-07-13 908 unsigned int active_max_loss_cnt; bc57ec20ec19b4d Paolo Abeni 2021-07-13 909 struct net *net = sock_net(sk); bc57ec20ec19b4d Paolo Abeni 2021-07-13 910 unsigned int stale_loss_cnt; bc57ec20ec19b4d Paolo Abeni 2021-07-13 911 bool slow, push; bc57ec20ec19b4d Paolo Abeni 2021-07-13 912 bc57ec20ec19b4d Paolo Abeni 2021-07-13 913 stale_loss_cnt = mptcp_stale_loss_cnt(net); bc57ec20ec19b4d Paolo Abeni 2021-07-13 914 if (subflow->stale || !stale_loss_cnt || subflow->stale_count <= stale_loss_cnt) bc57ec20ec19b4d Paolo Abeni 2021-07-13 915 return; bc57ec20ec19b4d Paolo Abeni 2021-07-13 916 bc57ec20ec19b4d Paolo Abeni 2021-07-13 917 /* look for another available subflow not in loss state */ bc57ec20ec19b4d Paolo Abeni 2021-07-13 918 active_max_loss_cnt = max_t(int, stale_loss_cnt - 1, 1); bc57ec20ec19b4d Paolo Abeni 2021-07-13 919 mptcp_for_each_subflow(msk, iter) { bc57ec20ec19b4d Paolo Abeni 2021-07-13 920 if (iter != subflow && mptcp_subflow_active(iter) && bc57ec20ec19b4d Paolo Abeni 2021-07-13 921 iter->stale_count < active_max_loss_cnt) { bc57ec20ec19b4d Paolo Abeni 2021-07-13 922 /* we have some alteratives, try to mark this subflow as idle ...*/ bc57ec20ec19b4d Paolo Abeni 2021-07-13 923 slow = lock_sock_fast(ssk); bc57ec20ec19b4d Paolo Abeni 2021-07-13 924 if (!tcp_rtx_and_write_queues_empty(ssk)) { bc57ec20ec19b4d Paolo Abeni 2021-07-13 925 subflow->stale = 1; bc57ec20ec19b4d Paolo Abeni 2021-07-13 926 push = __mptcp_retransmit_pending_data(sk); bc57ec20ec19b4d Paolo Abeni 2021-07-13 927 } "push" uninitialized on else path. bc57ec20ec19b4d Paolo Abeni 2021-07-13 928 unlock_sock_fast(ssk, slow); bc57ec20ec19b4d Paolo Abeni 2021-07-13 929 bc57ec20ec19b4d Paolo Abeni 2021-07-13 930 /* pending data on the idle subflow: retransmit */ bc57ec20ec19b4d Paolo Abeni 2021-07-13 @931 if (push) bc57ec20ec19b4d Paolo Abeni 2021-07-13 932 __mptcp_push_pending(sk, 0); bc57ec20ec19b4d Paolo Abeni 2021-07-13 933 return; bc57ec20ec19b4d Paolo Abeni 2021-07-13 934 } bc57ec20ec19b4d Paolo Abeni 2021-07-13 935 } bc57ec20ec19b4d Paolo Abeni 2021-07-13 936 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org