Hi Arseny, [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 v5.12-rc7] [cannot apply to next-20210413] [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/Arseny-Krasnov/virtio-vsock-intr... base: https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git linux-next config: x86_64-randconfig-s021-20210413 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-280-g2cd6d34e-dirty # https://github.com/0day-ci/linux/commit/c5fe1745b6ed6bc01a7f88737bd43fce7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Arseny-Krasnov/virtio-vsock-introduce-SOCK_SEQPACKET-support/20210413-205228 git checkout c5fe1745b6ed6bc01a7f88737bd43fce70349367 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) net/vmw_vsock/virtio_transport_common.c:450:23: sparse: sparse: context imbalance in 'virtio_transport_seqpacket_do_dequeue' - unexpected unlock vim +441 net/vmw_vsock/virtio_transport_common.c 395 396 static int virtio_transport_seqpacket_do_dequeue(struct vsock_sock *vsk, 397 struct msghdr *msg, 398 int flags, 399 bool *msg_ready) 400 { 401 struct virtio_vsock_sock *vvs = vsk->trans; 402 struct virtio_vsock_pkt *pkt; 403 int err = 0; 404 size_t user_buf_len = msg->msg_iter.count; 405 406 *msg_ready = false; 407 spin_lock_bh(&vvs->rx_lock); 408 409 while (!*msg_ready && !list_empty(&vvs->rx_queue) && err >= 0) { 410 pkt = list_first_entry(&vvs->rx_queue, struct virtio_vsock_pkt, list); 411 412 if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RW) { 413 size_t bytes_to_copy; 414 size_t pkt_len; 415 416 pkt_len = (size_t)le32_to_cpu(pkt->hdr.len); 417 bytes_to_copy = min(user_buf_len, pkt_len); 418 419 /* sk_lock is held by caller so no one else can dequeue. 420 * Unlock rx_lock since memcpy_to_msg() may sleep. 421 */ 422 spin_unlock_bh(&vvs->rx_lock); 423 424 if (memcpy_to_msg(msg, pkt->buf, bytes_to_copy)) { 425 err = -EINVAL; 426 break; 427 } 428 429 spin_lock_bh(&vvs->rx_lock); 430 431 /* If user sets 'MSG_TRUNC' we return real length 432 * of message. 433 */ 434 if (flags & MSG_TRUNC) 435 err += pkt_len; 436 else 437 err += bytes_to_copy; 438 439 user_buf_len -= bytes_to_copy; 440 442 *msg_ready = true; 443 } 444 445 virtio_transport_dec_rx_pkt(vvs, pkt); 446 list_del(&pkt->list); 447 virtio_transport_free_pkt(pkt); 448 } 449 450 spin_unlock_bh(&vvs->rx_lock); 451 452 virtio_transport_send_credit_update(vsk); 453 454 return err; 455 } 456 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org