================================================================== BUG: KCSAN: data-race in __io_cqring_fill_event / io_req_defer write to 0xffff8880305e85c0 of 4 bytes by task 22196 on cpu 0: io_get_cqring fs/io_uring.c:1301 [inline] __io_cqring_fill_event+0x116/0x410 fs/io_uring.c:1404 io_cqring_add_event fs/io_uring.c:1437 [inline] __io_req_complete+0xd8/0x1a0 fs/io_uring.c:1475 io_issue_sqe+0x7249/0x78d0 fs/io_uring.c:3672 io_wq_submit_work+0x23e/0x340 fs/io_uring.c:5939 io_worker_handle_work+0xa69/0xcf0 fs/io-wq.c:527 io_wqe_worker+0x1f2/0x860 fs/io-wq.c:569 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff8880305e85c0 of 4 bytes by task 22193 on cpu 1: req_need_defer fs/io_uring.c:1089 [inline] io_req_defer+0x3b6/0x550 fs/io_uring.c:5580 io_queue_sqe+0x21/0x220 fs/io_uring.c:6206 io_submit_sqe+0x333/0x550 fs/io_uring.c:6299 io_submit_sqes+0x8c6/0xfb0 fs/io_uring.c:6496 __do_sys_io_uring_enter fs/io_uring.c:8322 [inline] __se_sys_io_uring_enter+0x1c2/0x720 fs/io_uring.c:8281 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8281 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 22193 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================