tree: git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git master head: d5bd32a876c8cb677c9cc88dcc7eb498cd0c9397 commit: 9d9e937b1c8be97b424e3e11938e183fcde905c0 [24/38] ipv6/netfilter: Discard first fragment not including all headers config: x86_64-randconfig-a012-20201115 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id... git remote add netdev-net git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git git fetch --no-tags netdev-net master git checkout 9d9e937b1c8be97b424e3e11938e183fcde905c0 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: net/ipv6/netfilter/nf_conntrack_reasm.o: in function `nf_ct_frag6_gather': vim +462 net/ipv6/netfilter/nf_conntrack_reasm.c 439 440 int nf_ct_frag6_gather(struct net *net, struct sk_buff *skb, u32 user) 441 { 442 u16 savethdr = skb->transport_header; 443 u8 nexthdr = NEXTHDR_FRAGMENT; 444 int fhoff, nhoff, ret; 445 struct frag_hdr *fhdr; 446 struct frag_queue *fq; 447 struct ipv6hdr *hdr; 448 u8 prevhdr; 449 450 /* Jumbo payload inhibits frag. header */ 451 if (ipv6_hdr(skb)->payload_len == 0) { 452 pr_debug("payload len = 0\n"); 453 return 0; 454 } 455 456 if (find_prev_fhdr(skb, &prevhdr, &nhoff, &fhoff) < 0) 457 return 0; 458 459 /* Discard the first fragment if it does not include all headers 460 * RFC 8200, Section 4.5 461 */ 463 pr_debug("Drop incomplete fragment\n"); 464 return 0; 465 } 466 467 if (!pskb_may_pull(skb, fhoff + sizeof(*fhdr))) 468 return -ENOMEM; 469 470 skb_set_transport_header(skb, fhoff); 471 hdr = ipv6_hdr(skb); 472 fhdr = (struct frag_hdr *)skb_transport_header(skb); 473 474 skb_orphan(skb); 475 fq = fq_find(net, fhdr->identification, user, hdr, 476 skb->dev ? skb->dev->ifindex : 0); 477 if (fq == NULL) { 478 pr_debug("Can't find and can't create new queue\n"); 479 return -ENOMEM; 480 } 481 482 spin_lock_bh(&fq->q.lock); 483 484 ret = nf_ct_frag6_queue(fq, skb, fhdr, nhoff); 485 if (ret == -EPROTO) { 486 skb->transport_header = savethdr; 487 ret = 0; 488 } 489 490 spin_unlock_bh(&fq->q.lock); 491 inet_frag_put(&fq->q); 492 return ret; 493 } 494 EXPORT_SYMBOL_GPL(nf_ct_frag6_gather); 495 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org