tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e644645abf4788e919beeb97925fb6bf43e890a2 commit: 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 net: Support GRO/GSO fraglist chaining. date: 4 months ago config: h8300-randconfig-m001-20200521 (attached as .config) compiler: h8300-linux-gcc (GCC) 9.3.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 3a1296a38d0cf62bffb9a03c585cbd5dbf15d596 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=h8300 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; New smatch warnings: net/core/skbuff.c:3673 skb_segment_list() warn: inconsistent indenting Old smatch warnings: net/core/skbuff.c:105 skb_panic() warn: argument 8 to %#lx specifier is cast from pointer net/core/skbuff.c:105 skb_panic() warn: argument 9 to %#lx specifier is cast from pointer net/core/skbuff.c:3845 skb_segment() error: we previously assumed 'list_skb' could be null (see line 3765) vim +3673 net/core/skbuff.c 3641 3642 struct sk_buff *skb_segment_list(struct sk_buff *skb, 3643 netdev_features_t features, 3644 unsigned int offset) 3645 { 3646 struct sk_buff *list_skb = skb_shinfo(skb)->frag_list; 3647 unsigned int tnl_hlen = skb_tnl_header_len(skb); 3648 unsigned int delta_truesize = 0; 3649 unsigned int delta_len = 0; 3650 struct sk_buff *tail = NULL; 3651 struct sk_buff *nskb; 3652 3653 skb_push(skb, -skb_network_offset(skb) + offset); 3654 3655 skb_shinfo(skb)->frag_list = NULL; 3656 3657 do { 3658 nskb = list_skb; 3659 list_skb = list_skb->next; 3660 3661 if (!tail) 3662 skb->next = nskb; 3663 else 3664 tail->next = nskb; 3665 3666 tail = nskb; 3667 3668 delta_len += nskb->len; 3669 delta_truesize += nskb->truesize; 3670 3671 skb_push(nskb, -skb_network_offset(nskb) + offset); 3672 3674 3675 skb_headers_offset_update(nskb, skb_headroom(nskb) - skb_headroom(skb)); 3676 skb_copy_from_linear_data_offset(skb, -tnl_hlen, 3677 nskb->data - tnl_hlen, 3678 offset + tnl_hlen); 3679 3680 if (skb_needs_linearize(nskb, features) && 3681 __skb_linearize(nskb)) 3682 goto err_linearize; 3683 3684 } while (list_skb); 3685 3686 skb->truesize = skb->truesize - delta_truesize; 3687 skb->data_len = skb->data_len - delta_len; 3688 skb->len = skb->len - delta_len; 3689 3690 skb_gso_reset(skb); 3691 3692 skb->prev = tail; 3693 3694 if (skb_needs_linearize(skb, features) && 3695 __skb_linearize(skb)) 3696 goto err_linearize; 3697 3698 skb_get(skb); 3699 3700 return skb; 3701 3702 err_linearize: 3703 kfree_skb_list(skb->next); 3704 skb->next = NULL; 3705 return ERR_PTR(-ENOMEM); 3706 } 3707 EXPORT_SYMBOL_GPL(skb_segment_list); 3708 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org