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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

write to 0xffff888135f38200 of 4 bytes by task 5285 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+0x65/0x520 fs/io_uring.c:2112
 io_req_complete_post fs/io_uring.c:2146 [inline]
 io_req_complete_failed+0xa1/0x270 fs/io_uring.c:2177
 __io_queue_sqe+0x2f9/0x460 fs/io_uring.c:7622
 io_queue_sqe fs/io_uring.c:7647 [inline]
 io_submit_sqe+0x7d2/0x4a63 fs/io_uring.c:7855
 io_submit_sqes+0x278/0x6c0 fs/io_uring.c:7961
 __do_sys_io_uring_enter fs/io_uring.c:11011 [inline]
 __se_sys_io_uring_enter+0x2a2/0xbe0 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/0x50 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888135f38200 of 4 bytes by task 5281 on cpu 0:
 __io_cqring_events fs/io_uring.c:1850 [inline]
 io_cqring_events fs/io_uring.c:2769 [inline]
 io_uring_poll+0xc6/0x146 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+0x717/0xf50 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: 0x000000f9 -> 0x00000103

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 5281 Comm: syz-executor.1 Not tainted 5.17.0-syzkaller-14079-gbe2d3ecedd99-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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