================================================================== BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll write to 0xffff8881436ec200 of 4 bytes by task 2863 on cpu 0: io_get_cqe fs/io_uring.c:1846 [inline] __io_fill_cqe fs/io_uring.c:2056 [inline] __io_fill_cqe_req+0x129/0x3a0 fs/io_uring.c:2069 __io_req_complete_post+0x59/0x410 fs/io_uring.c:2092 io_req_complete_post fs/io_uring.c:2120 [inline] io_req_complete_failed+0xa6/0x250 fs/io_uring.c:2151 __io_queue_sqe+0x320/0x7a0 fs/io_uring.c:7543 io_queue_sqe fs/io_uring.c:7568 [inline] io_submit_sqe+0x7d2/0x4a5d fs/io_uring.c:7776 io_submit_sqes+0x278/0x6c0 fs/io_uring.c:7882 __do_sys_io_uring_enter fs/io_uring.c:10924 [inline] __se_sys_io_uring_enter+0x2a2/0xbe0 fs/io_uring.c:10850 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:10850 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881436ec200 of 4 bytes by task 2853 on cpu 1: __io_cqring_events fs/io_uring.c:1830 [inline] io_cqring_events fs/io_uring.c:2739 [inline] io_uring_poll+0xc6/0x146 fs/io_uring.c:10131 vfs_poll include/linux/poll.h:88 [inline] ep_item_poll fs/eventpoll.c:853 [inline] ep_send_events fs/eventpoll.c:1692 [inline] ep_poll fs/eventpoll.c:1806 [inline] do_epoll_wait+0x717/0xf50 fs/eventpoll.c:2234 __do_sys_epoll_wait fs/eventpoll.c:2246 [inline] __se_sys_epoll_wait fs/eventpoll.c:2241 [inline] __x64_sys_epoll_wait+0x119/0x140 fs/eventpoll.c:2241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x50 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000133a -> 0x00001342 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 2853 Comm: syz-executor.0 Not tainted 5.17.0-syzkaller-13410-g74164d284b29-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================