tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 0c18f29aae7ce3dadd26d8ee3505d07cc982df75 commit: e10fa96d347488d1fd278e84f52ba7b25067cc71 xprtrdma: Move cqe to struct rpcrdma_mr config: x86_64-randconfig-m001-20210622 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Reported-by: Dan Carpenter <dan.carpenter(a)oracle.com&gt; New smatch warnings: net/sunrpc/xprtrdma/frwr_ops.c:647 frwr_unmap_async() error: potentially dereferencing uninitialized 'last'. Old smatch warnings: net/sunrpc/xprtrdma/frwr_ops.c:546 frwr_unmap_sync() error: potentially dereferencing uninitialized 'last'. vim +/last +647 net/sunrpc/xprtrdma/frwr_ops.c d8099feda4833b Chuck Lever 2019-06-19 608 void frwr_unmap_async(struct rpcrdma_xprt *r_xprt, struct rpcrdma_req *req) d8099feda4833b Chuck Lever 2019-06-19 609 { d8099feda4833b Chuck Lever 2019-06-19 610 struct ib_send_wr *first, *last, **prev; 5ecef9c8436695 Chuck Lever 2020-11-09 611 struct rpcrdma_ep *ep = r_xprt->rx_ep; d8099feda4833b Chuck Lever 2019-06-19 612 struct rpcrdma_frwr *frwr; d8099feda4833b Chuck Lever 2019-06-19 613 struct rpcrdma_mr *mr; d8099feda4833b Chuck Lever 2019-06-19 614 int rc; d8099feda4833b Chuck Lever 2019-06-19 615 d8099feda4833b Chuck Lever 2019-06-19 616 /* Chain the LOCAL_INV Work Requests and post them with d8099feda4833b Chuck Lever 2019-06-19 617 * a single ib_post_send() call. d8099feda4833b Chuck Lever 2019-06-19 618 */ d8099feda4833b Chuck Lever 2019-06-19 619 frwr = NULL; d8099feda4833b Chuck Lever 2019-06-19 620 prev = &first; 265a38d4611360 Chuck Lever 2019-08-19 621 while ((mr = rpcrdma_mr_pop(&req->rl_registered))) { Is it possible for the ->rl_registered list to be empty? If not, then just ignore this email. d8099feda4833b Chuck Lever 2019-06-19 622 d8099feda4833b Chuck Lever 2019-06-19 623 trace_xprtrdma_mr_localinv(mr); d8099feda4833b Chuck Lever 2019-06-19 624 r_xprt->rx_stats.local_inv_needed++; d8099feda4833b Chuck Lever 2019-06-19 625 d8099feda4833b Chuck Lever 2019-06-19 626 frwr = &mr->frwr; d8099feda4833b Chuck Lever 2019-06-19 627 last = &frwr->fr_invwr; d8099feda4833b Chuck Lever 2019-06-19 628 last->next = NULL; e10fa96d347488 Chuck Lever 2021-04-19 629 last->wr_cqe = &mr->mr_cqe; d8099feda4833b Chuck Lever 2019-06-19 630 last->sg_list = NULL; d8099feda4833b Chuck Lever 2019-06-19 631 last->num_sge = 0; d8099feda4833b Chuck Lever 2019-06-19 632 last->opcode = IB_WR_LOCAL_INV; d8099feda4833b Chuck Lever 2019-06-19 633 last->send_flags = IB_SEND_SIGNALED; d8099feda4833b Chuck Lever 2019-06-19 634 last->ex.invalidate_rkey = mr->mr_handle; d8099feda4833b Chuck Lever 2019-06-19 635 e10fa96d347488 Chuck Lever 2021-04-19 636 last->wr_cqe->done = frwr_wc_localinv; e10fa96d347488 Chuck Lever 2021-04-19 637 d8099feda4833b Chuck Lever 2019-06-19 638 *prev = last; d8099feda4833b Chuck Lever 2019-06-19 639 prev = &last->next; d8099feda4833b Chuck Lever 2019-06-19 640 } d8099feda4833b Chuck Lever 2019-06-19 641 d8099feda4833b Chuck Lever 2019-06-19 642 /* Strong send queue ordering guarantees that when the d8099feda4833b Chuck Lever 2019-06-19 643 * last WR in the chain completes, all WRs in the chain d8099feda4833b Chuck Lever 2019-06-19 644 * are complete. The last completion will wake up the d8099feda4833b Chuck Lever 2019-06-19 645 * RPC waiter. d8099feda4833b Chuck Lever 2019-06-19 646 */ e10fa96d347488 Chuck Lever 2021-04-19 @647 last->wr_cqe->done = frwr_wc_localinv_done; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org