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Message-ID: <202610071443.fPSmPC1O-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Unfiltered warning: this smatch report is sent as-is and has not been reviewed for false positives, so please treat it with due skepticism. BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: cros-kernel-buildreports@googlegroups.com tree: https://android.googlesource.com/kernel/common android17-6.18 head: 4a1ebb4dbbcfe1be0fcf08551de20bba67db04fd commit: f43f77499ec8de0af0b54d812c5d37f0120aeec1 [15/15] io_uring: protect remaining lockless ctx->rings accesses with RCU :::::: branch date: 10 hours ago :::::: commit date: 6 months ago config: i386-randconfig-2200-20261006 (https://download.01.org/0day-ci/archive/20261007/202610071443.fPSmPC1O-lkp@intel.com/config) compiler: gcc-13 (Debian 13.3.0-16) 13.3.0 smatch: v0.5.0-9187-g5189e3fb If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202610071443.fPSmPC1O-lkp@intel.com/ New smatch warnings: io_uring/io_uring.c:2802 io_cqring_wait() warn: inconsistent returns 'rcu_read'. Old smatch warnings: io_uring/io_uring.c:2042 io_file_get_normal() warn: fd re-used after fget(): 'fd' vim +/rcu_read +2802 io_uring/io_uring.c 45a41e74b8f472 io_uring/io_uring.c Jens Axboe 2024-01-04 2666 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2667 /* 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2668 * Wait until events become available, if we don't already have some. The 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2669 * application must reap them itself, as they reside on the shared cq ring. 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2670 */ d29cb3726f03cd io_uring/io_uring.c Pavel Begunkov 2024-08-07 2671 static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags, f42b58e44802b0 io_uring/io_uring.c Jens Axboe 2024-08-15 2672 struct ext_arg *ext_arg) 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2673 { 90291099f24a82 fs/io_uring.c Pavel Begunkov 2021-08-09 2674 struct io_wait_queue iowq; f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2675 struct io_rings *rings; 1100c4a2656d44 io_uring/io_uring.c Jens Axboe 2024-01-04 2676 ktime_t start_time; f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2677 int ret, nr_wait; 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2678 816619782bdc70 io_uring/io_uring.c Pavel Begunkov 2025-03-24 2679 min_events = min_t(int, min_events, ctx->cq_entries); 816619782bdc70 io_uring/io_uring.c Pavel Begunkov 2025-03-24 2680 76de6749d1bc18 io_uring/io_uring.c Pavel Begunkov 2022-09-08 2681 if (!io_allowed_run_tw(ctx)) 76de6749d1bc18 io_uring/io_uring.c Pavel Begunkov 2022-09-08 2682 return -EEXIST; 40cfe553240b32 io_uring/io_uring.c David Wei 2024-11-20 2683 if (io_local_work_pending(ctx)) 49c5c63d48eb5b io_uring/io_uring.c Jens Axboe 2024-11-26 2684 io_run_local_work(ctx, min_events, 49c5c63d48eb5b io_uring/io_uring.c Jens Axboe 2024-11-26 2685 max(IO_LOCAL_TW_DEFAULT_MAX, min_events)); f36ba6cf1ab6b0 io_uring/io_uring.c Pavel Begunkov 2023-01-05 2686 io_run_task_work(); 408024b959275b io_uring/io_uring.c Pavel Begunkov 2024-04-10 2687 408024b959275b io_uring/io_uring.c Pavel Begunkov 2024-04-10 2688 if (unlikely(test_bit(IO_CHECK_CQ_OVERFLOW_BIT, &ctx->check_cq))) 408024b959275b io_uring/io_uring.c Pavel Begunkov 2024-04-10 2689 io_cqring_do_overflow_flush(ctx); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2690 f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2691 rcu_read_lock(); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2692 rings = io_get_rings(ctx); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2693 if (__io_cqring_events_user(ctx) >= min_events) { f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2694 rcu_read_unlock(); 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2695 return 0; f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2696 } 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2697 90291099f24a82 fs/io_uring.c Pavel Begunkov 2021-08-09 2698 init_waitqueue_func_entry(&iowq.wq, io_wake_function); 90291099f24a82 fs/io_uring.c Pavel Begunkov 2021-08-09 2699 iowq.wq.private = current; 90291099f24a82 fs/io_uring.c Pavel Begunkov 2021-08-09 2700 INIT_LIST_HEAD(&iowq.wq.entry); 90291099f24a82 fs/io_uring.c Pavel Begunkov 2021-08-09 2701 iowq.ctx = ctx; f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2702 iowq.cq_tail = READ_ONCE(rings->cq.head) + min_events; f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2703 iowq.cq_min_tail = READ_ONCE(rings->cq.tail); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2704 nr_wait = (int) iowq.cq_tail - READ_ONCE(rings->cq.tail); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2705 rcu_read_unlock(); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2706 rings = NULL; 1100c4a2656d44 io_uring/io_uring.c Jens Axboe 2024-01-04 2707 iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts); 1100c4a2656d44 io_uring/io_uring.c Jens Axboe 2024-01-04 2708 iowq.hit_timeout = 0; 7ed9e09e2d13d5 io_uring/io_uring.c Jens Axboe 2024-01-04 2709 iowq.min_timeout = ext_arg->min_time; d33a39e577687e io_uring/io_uring.c Pavel Begunkov 2023-01-05 2710 iowq.timeout = KTIME_MAX; 1100c4a2656d44 io_uring/io_uring.c Jens Axboe 2024-01-04 2711 start_time = io_get_time(ctx); d33a39e577687e io_uring/io_uring.c Pavel Begunkov 2023-01-05 2712 0a54a7dd0a12b7 io_uring/io_uring.c Jens Axboe 2024-10-22 2713 if (ext_arg->ts_set) { 0a54a7dd0a12b7 io_uring/io_uring.c Jens Axboe 2024-10-22 2714 iowq.timeout = timespec64_to_ktime(ext_arg->ts); d29cb3726f03cd io_uring/io_uring.c Pavel Begunkov 2024-08-07 2715 if (!(flags & IORING_ENTER_ABS_TIMER)) 1100c4a2656d44 io_uring/io_uring.c Jens Axboe 2024-01-04 2716 iowq.timeout = ktime_add(iowq.timeout, start_time); d33a39e577687e io_uring/io_uring.c Pavel Begunkov 2023-01-05 2717 } 90291099f24a82 fs/io_uring.c Pavel Begunkov 2021-08-09 2718 f42b58e44802b0 io_uring/io_uring.c Jens Axboe 2024-08-15 2719 if (ext_arg->sig) { 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2720 #ifdef CONFIG_COMPAT 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2721 if (in_compat_syscall()) f42b58e44802b0 io_uring/io_uring.c Jens Axboe 2024-08-15 2722 ret = set_compat_user_sigmask((const compat_sigset_t __user *)ext_arg->sig, f42b58e44802b0 io_uring/io_uring.c Jens Axboe 2024-08-15 2723 ext_arg->argsz); 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2724 else 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2725 #endif f42b58e44802b0 io_uring/io_uring.c Jens Axboe 2024-08-15 2726 ret = set_user_sigmask(ext_arg->sig, ext_arg->argsz); 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2727 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2728 if (ret) 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2729 return ret; 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2730 } 978e5c19dfefc2 io_uring/io_uring.c Alexey Izbyshev 2024-04-05 2731 8d0c12a80cdeb8 io_uring/io_uring.c Stefan Roesch 2023-06-08 2732 io_napi_busy_loop(ctx, &iowq); 8d0c12a80cdeb8 io_uring/io_uring.c Stefan Roesch 2023-06-08 2733 c826bd7a743f27 fs/io_uring.c Dmitrii Dolgov 2019-10-15 2734 trace_io_uring_cqring_wait(ctx, min_events); bda521624e75c6 fs/io_uring.c Jens Axboe 2019-09-24 2735 do { 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2736 unsigned long check_cq; 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2737 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2738 if (ctx->flags & IORING_SETUP_DEFER_TASKRUN) { 8751d15426a31b io_uring/io_uring.c Pavel Begunkov 2023-04-06 2739 atomic_set(&ctx->cq_wait_nr, nr_wait); 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2740 set_current_state(TASK_INTERRUPTIBLE); 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2741 } else { 311997b3fcddc2 fs/io_uring.c Pavel Begunkov 2021-06-14 2742 prepare_to_wait_exclusive(&ctx->cq_wait, &iowq.wq, bda521624e75c6 fs/io_uring.c Jens Axboe 2019-09-24 2743 TASK_INTERRUPTIBLE); 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2744 } 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2745 07754bfd9aee59 io_uring/io_uring.c Jens Axboe 2025-03-14 2746 ret = io_cqring_wait_schedule(ctx, &iowq, ext_arg, start_time); 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2747 __set_current_state(TASK_RUNNING); b4bc35cf8704db io_uring/io_uring.c Pavel Begunkov 2024-01-17 2748 atomic_set(&ctx->cq_wait_nr, IO_CQ_WAKE_INIT); d80c0f00d04766 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2749 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2750 /* 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2751 * Run task_work after scheduling and before io_should_wake(). 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2752 * If we got woken because of task_work being processed, run it 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2753 * now rather than let the caller do another wait loop. 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2754 */ 40cfe553240b32 io_uring/io_uring.c David Wei 2024-11-20 2755 if (io_local_work_pending(ctx)) 49c5c63d48eb5b io_uring/io_uring.c Jens Axboe 2024-11-26 2756 io_run_local_work(ctx, nr_wait, nr_wait); 04beb6e0e08c30 io_uring/io_uring.c Jens Axboe 2024-09-18 2757 io_run_task_work(); 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2758 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2759 /* 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2760 * Non-local task_work will be run on exit to userspace, but 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2761 * if we're using DEFER_TASKRUN, then we could have waited 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2762 * with a timeout for a number of requests. If the timeout 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2763 * hits, we could have some requests ready to process. Ensure 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2764 * this break is _after_ we have run task_work, to avoid 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2765 * deferring running potentially pending requests until the 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2766 * next time we wait for events. 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2767 */ 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2768 if (ret < 0) 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2769 break; 6ff1407e24e6fd io_uring/io_uring.c Jens Axboe 2024-01-04 2770 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2771 check_cq = READ_ONCE(ctx->check_cq); 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2772 if (unlikely(check_cq)) { 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2773 /* let the caller flush overflows, retry */ 326a9e482e2134 io_uring/io_uring.c Pavel Begunkov 2023-01-05 2774 if (check_cq & BIT(IO_CHECK_CQ_OVERFLOW_BIT)) 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2775 io_cqring_do_overflow_flush(ctx); 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2776 if (check_cq & BIT(IO_CHECK_CQ_DROPPED_BIT)) { 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2777 ret = -EBADR; 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2778 break; 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2779 } 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2780 } 3fcf19d592d5cb io_uring/io_uring.c Pavel Begunkov 2023-01-05 2781 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2782 if (io_should_wake(&iowq)) { 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2783 ret = 0; 35d90f95cfa773 io_uring/io_uring.c Jens Axboe 2022-12-17 2784 break; 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2785 } ca0a26511c679a fs/io_uring.c Jens Axboe 2021-03-04 2786 cond_resched(); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2787 f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2788 /* if min timeout has been hit, don't reset wait count */ f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2789 if (!iowq.hit_timeout) f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2790 scoped_guard(rcu) f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2791 nr_wait = (int) iowq.cq_tail - f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2792 READ_ONCE(io_get_rings(ctx)->cq.tail); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2793 else f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2794 nr_wait = 1; 846072f16eed3b io_uring/io_uring.c Pavel Begunkov 2023-01-05 2795 } while (1); bda521624e75c6 fs/io_uring.c Jens Axboe 2019-09-24 2796 130bd686d9be91 io_uring/io_uring.c Pavel Begunkov 2023-01-09 2797 if (!(ctx->flags & IORING_SETUP_DEFER_TASKRUN)) b4f20bb4e6d55a fs/io_uring.c Jens Axboe 2022-03-25 2798 finish_wait(&ctx->cq_wait, &iowq.wq); b7db41c9e03b51 fs/io_uring.c Jens Axboe 2020-07-04 2799 restore_saved_sigmask_unless(ret == -EINTR); 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2800 f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 2801 guard(rcu)(); f43f77499ec8de io_uring/io_uring.c Jens Axboe 2026-03-31 @2802 return READ_ONCE(io_get_rings(ctx)->cq.head) == READ_ONCE(io_get_rings(ctx)->cq.tail) ? ret : 0; 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2803 } 2b188cc1bb857a fs/io_uring.c Jens Axboe 2019-01-07 2804 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki