Hi John, url: https://github.com/0day-ci/linux/commits/John-Fastabend/sockmap-fixes-pic... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: i386-randconfig-m021-20210720 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 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/core/skmsg.c:627 sk_psock_backlog() error: uninitialized symbol 'skb'. net/core/skmsg.c:639 sk_psock_backlog() error: uninitialized symbol 'off'. net/core/skmsg.c:640 sk_psock_backlog() error: uninitialized symbol 'len'. vim +/skb +627 net/core/skmsg.c 604326b41a6fb9 Daniel Borkmann 2018-10-13 609 static void sk_psock_backlog(struct work_struct *work) 604326b41a6fb9 Daniel Borkmann 2018-10-13 610 { 604326b41a6fb9 Daniel Borkmann 2018-10-13 611 struct sk_psock *psock = container_of(work, struct sk_psock, work); 604326b41a6fb9 Daniel Borkmann 2018-10-13 612 struct sk_psock_work_state *state = &psock->work_state; 604326b41a6fb9 Daniel Borkmann 2018-10-13 613 struct sk_buff *skb; 604326b41a6fb9 Daniel Borkmann 2018-10-13 614 bool ingress; 604326b41a6fb9 Daniel Borkmann 2018-10-13 615 u32 len, off; 604326b41a6fb9 Daniel Borkmann 2018-10-13 616 int ret; 604326b41a6fb9 Daniel Borkmann 2018-10-13 617 799aa7f98d53e0 Cong Wang 2021-03-30 618 mutex_lock(&psock->work_mutex); d1f6b1c794e27f John Fastabend 2021-07-19 619 if (unlikely(state->skb)) { d1f6b1c794e27f John Fastabend 2021-07-19 620 spin_lock_bh(&psock->ingress_lock); 604326b41a6fb9 Daniel Borkmann 2018-10-13 621 skb = state->skb; 604326b41a6fb9 Daniel Borkmann 2018-10-13 622 len = state->len; 604326b41a6fb9 Daniel Borkmann 2018-10-13 623 off = state->off; 604326b41a6fb9 Daniel Borkmann 2018-10-13 624 state->skb = NULL; d1f6b1c794e27f John Fastabend 2021-07-19 625 spin_unlock_bh(&psock->ingress_lock); 604326b41a6fb9 Daniel Borkmann 2018-10-13 626 } skb uninitialized on else path. d1f6b1c794e27f John Fastabend 2021-07-19 @627 if (skb) d1f6b1c794e27f John Fastabend 2021-07-19 628 goto start; 604326b41a6fb9 Daniel Borkmann 2018-10-13 629 604326b41a6fb9 Daniel Borkmann 2018-10-13 630 while ((skb = skb_dequeue(&psock->ingress_skb))) { 604326b41a6fb9 Daniel Borkmann 2018-10-13 631 len = skb->len; 604326b41a6fb9 Daniel Borkmann 2018-10-13 632 off = 0; 604326b41a6fb9 Daniel Borkmann 2018-10-13 633 start: e3526bb92a2084 Cong Wang 2021-02-23 634 ingress = skb_bpf_ingress(skb); e3526bb92a2084 Cong Wang 2021-02-23 635 skb_bpf_redirect_clear(skb); 604326b41a6fb9 Daniel Borkmann 2018-10-13 636 do { 604326b41a6fb9 Daniel Borkmann 2018-10-13 637 ret = -EIO; 799aa7f98d53e0 Cong Wang 2021-03-30 638 if (!sock_flag(psock->sk, SOCK_DEAD)) 604326b41a6fb9 Daniel Borkmann 2018-10-13 @639 ret = sk_psock_handle_skb(psock, skb, off, 604326b41a6fb9 Daniel Borkmann 2018-10-13 @640 len, ingress); 604326b41a6fb9 Daniel Borkmann 2018-10-13 641 if (ret <= 0) { 604326b41a6fb9 Daniel Borkmann 2018-10-13 642 if (ret == -EAGAIN) { d1f6b1c794e27f John Fastabend 2021-07-19 643 sk_psock_skb_state(psock, state, skb, d1f6b1c794e27f John Fastabend 2021-07-19 644 len, off); 604326b41a6fb9 Daniel Borkmann 2018-10-13 645 goto end; 604326b41a6fb9 Daniel Borkmann 2018-10-13 646 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 647 /* Hard errors break pipe and stop xmit. */ 604326b41a6fb9 Daniel Borkmann 2018-10-13 648 sk_psock_report_error(psock, ret ? -ret : EPIPE); 604326b41a6fb9 Daniel Borkmann 2018-10-13 649 sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED); 781dd0431eb549 Cong Wang 2021-06-14 650 sock_drop(psock->sk, skb); 604326b41a6fb9 Daniel Borkmann 2018-10-13 651 goto end; 604326b41a6fb9 Daniel Borkmann 2018-10-13 652 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 653 off += ret; 604326b41a6fb9 Daniel Borkmann 2018-10-13 654 len -= ret; 604326b41a6fb9 Daniel Borkmann 2018-10-13 655 } while (len); 604326b41a6fb9 Daniel Borkmann 2018-10-13 656 604326b41a6fb9 Daniel Borkmann 2018-10-13 657 if (!ingress) 604326b41a6fb9 Daniel Borkmann 2018-10-13 658 kfree_skb(skb); 604326b41a6fb9 Daniel Borkmann 2018-10-13 659 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 660 end: 799aa7f98d53e0 Cong Wang 2021-03-30 661 mutex_unlock(&psock->work_mutex); 604326b41a6fb9 Daniel Borkmann 2018-10-13 662 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org