tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: ccb3e3ddfae0c4a0ca4ec34699a965637f2c15e0 commit: d97c3e7785e0bbc76a30f4d8953cf278a7b25886 [38/42] virtio_net: Do not pull payload in skb->head config: x86_64-randconfig-r021-20210411 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dd453a1389b6a7e6d9214b449d3c54981b1a89b6) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout d97c3e7785e0bbc76a30f4d8953cf278a7b25886 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>): copy = ETH_HLEN + metasize; ^ 1 error generated. vim +/metasize +414 drivers/net/virtio_net.c 373 374 /* Called from bottom half context */ 375 static struct sk_buff *page_to_skb(struct virtnet_info *vi, 376 struct receive_queue *rq, 377 struct page *page, unsigned int offset, 378 unsigned int len, unsigned int truesize, 379 bool hdr_valid) 380 { 381 struct sk_buff *skb; 382 struct virtio_net_hdr_mrg_rxbuf *hdr; 383 unsigned int copy, hdr_len, hdr_padded_len; 384 char *p; 385 386 p = page_address(page) + offset; 387 388 /* copy small packet so we can reuse these pages for small data */ 389 skb = napi_alloc_skb(&rq->napi, GOOD_COPY_LEN); 390 if (unlikely(!skb)) 391 return NULL; 392 393 hdr = skb_vnet_hdr(skb); 394 395 hdr_len = vi->hdr_len; 396 if (vi->mergeable_rx_bufs) 397 hdr_padded_len = sizeof(*hdr); 398 else 399 hdr_padded_len = sizeof(struct padded_vnet_hdr); 400 401 if (hdr_valid) 402 memcpy(hdr, p, hdr_len); 403 404 len -= hdr_len; 405 offset += hdr_padded_len; 406 p += hdr_padded_len; 407 408 /* Copy all frame if it fits skb->head, otherwise 409 * we let virtio_net_hdr_to_skb() and GRO pull headers as needed. 410 */ 411 if (len <= skb_tailroom(skb)) 412 copy = len; 413 else 415 skb_put_data(skb, p, copy); 416 417 len -= copy; 418 offset += copy; 419 420 if (vi->mergeable_rx_bufs) { 421 if (len) 422 skb_add_rx_frag(skb, 0, page, offset, len, truesize); 423 else 424 put_page(page); 425 return skb; 426 } 427 428 /* 429 * Verify that we can indeed put this data into a skb. 430 * This is here to handle cases when the device erroneously 431 * tries to receive more than is possible. This is usually 432 * the case of a broken device. 433 */ 434 if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) { 435 net_dbg_ratelimited("%s: too much data\n", skb->dev->name); 436 dev_kfree_skb(skb); 437 return NULL; 438 } 439 BUG_ON(offset >= PAGE_SIZE); 440 while (len) { 441 unsigned int frag_size = min((unsigned)PAGE_SIZE - offset, len); 442 skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page, offset, 443 frag_size, truesize); 444 len -= frag_size; 445 page = (struct page *)page->private; 446 offset = 0; 447 } 448 449 if (page) 450 give_pages(rq, page); 451 452 return skb; 453 } 454 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org