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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

write to 0xffff8881298ffa00 of 4 bytes by task 25368 on cpu 0:
 io_get_cqe fs/io_uring.c:1847 [inline]
 __io_fill_cqe fs/io_uring.c:2057 [inline]
 __io_fill_cqe_req+0x129/0x3a0 fs/io_uring.c:2070
 __io_req_complete_post+0x59/0x410 fs/io_uring.c:2093
 io_req_complete_post fs/io_uring.c:2121 [inline]
 io_req_complete_failed+0xa6/0x250 fs/io_uring.c:2152
 __io_queue_sqe+0x320/0x7a0 fs/io_uring.c:7543
 io_queue_sqe fs/io_uring.c:7568 [inline]
 io_submit_sqe+0x7d2/0x4ac1 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/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881298ffa00 of 4 bytes by task 25367 on cpu 1:
 __io_cqring_events fs/io_uring.c:1831 [inline]
 io_cqring_events fs/io_uring.c:2740 [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+0x6b7/0xf40 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: 0x000031c5 -> 0x000031d4

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25367 Comm: syz-executor.5 Not tainted 5.17.0-syzkaller-02172-g6b1f86f8e9c7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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