==================================================================
BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

write to 0xffff88812fcc0200 of 4 bytes by task 19303 on cpu 1:
 io_get_cqe fs/io_uring.c:1866 [inline]
 __io_fill_cqe fs/io_uring.c:2076 [inline]
 __io_fill_cqe_req+0x129/0x3a0 fs/io_uring.c:2089
 __io_req_complete_post+0x65/0x580 fs/io_uring.c:2112
 io_req_complete_post fs/io_uring.c:2146 [inline]
 io_req_complete_failed+0xa1/0x260 fs/io_uring.c:2177
 __io_queue_sqe fs/io_uring.c:7622 [inline]
 io_queue_sqe fs/io_uring.c:7647 [inline]
 io_submit_sqe+0x414a/0x49a0 fs/io_uring.c:7855
 io_submit_sqes+0x25e/0x7e0 fs/io_uring.c:7961
 __do_sys_io_uring_enter fs/io_uring.c:11011 [inline]
 __se_sys_io_uring_enter+0x2cb/0xc50 fs/io_uring.c:10937
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:10937
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812fcc0200 of 4 bytes by task 19301 on cpu 0:
 __io_cqring_events fs/io_uring.c:1850 [inline]
 io_cqring_events fs/io_uring.c:2769 [inline]
 io_uring_poll+0xc5/0x150 fs/io_uring.c:10218
 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+0x717/0xf10 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/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000187 -> 0x000001a0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 19301 Comm: syz-executor.0 Not tainted 5.18.0-rc1-syzkaller-00184-g1831fed55973-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================