Hi Jiang, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on vhost/linux-next] [also build test WARNING on tip/perf/core linus/master v5.13-rc6] [cannot apply to next-20210615] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Jiang-Wang/virtio-vsock-introduc... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: x86_64-randconfig-a015-20210615 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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://github.com/0day-ci/linux/commit/b156a0ad587c43dbfc98397f01b34fad1... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jiang-Wang/virtio-vsock-introduce-SOCK_DGRAM-support/20210616-120056 git checkout b156a0ad587c43dbfc98397f01b34fad15054bf0 # 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 warnings (new ones prefixed by >>): u32 free_space; ^ 1 warning generated. vim +/free_space +416 net/vmw_vsock/virtio_transport_common.c 408 409 static ssize_t 410 virtio_transport_dgram_do_dequeue(struct vsock_sock *vsk, 411 struct msghdr *msg, size_t len) 412 { 413 struct virtio_vsock_sock *vvs = vsk->trans; 414 struct virtio_vsock_pkt *pkt; 415 size_t total = 0; 417 int err = -EFAULT; 418 419 spin_lock_bh(&vvs->rx_lock); 420 if (total < len && !list_empty(&vvs->rx_queue)) { 421 pkt = list_first_entry(&vvs->rx_queue, 422 struct virtio_vsock_pkt, list); 423 424 total = len; 425 if (total > pkt->len - pkt->off) 426 total = pkt->len - pkt->off; 427 else if (total < pkt->len - pkt->off) 428 msg->msg_flags |= MSG_TRUNC; 429 430 /* sk_lock is held by caller so no one else can dequeue. 431 * Unlock rx_lock since memcpy_to_msg() may sleep. 432 */ 433 spin_unlock_bh(&vvs->rx_lock); 434 435 err = memcpy_to_msg(msg, pkt->buf + pkt->off, total); 436 if (err) 437 return err; 438 439 spin_lock_bh(&vvs->rx_lock); 440 441 virtio_transport_dec_rx_pkt(vvs, pkt); 442 list_del(&pkt->list); 443 virtio_transport_free_pkt(pkt); 444 } 445 446 free_space = vvs->buf_alloc - (vvs->fwd_cnt - vvs->last_fwd_cnt); 447 448 spin_unlock_bh(&vvs->rx_lock); 449 450 if (total > 0 && msg->msg_name) { 451 /* Provide the address of the sender. */ 452 DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name); 453 454 vsock_addr_init(vm_addr, le64_to_cpu(pkt->hdr.src_cid), 455 le32_to_cpu(pkt->hdr.src_port)); 456 msg->msg_namelen = sizeof(*vm_addr); 457 } 458 return total; 459 } 460 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org