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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

read-write to 0xffff888131a6a250 of 4 bytes by task 2696 on cpu 1:
 io_get_cqe fs/io_uring.c:2233 [inline]
 __io_fill_cqe_req+0x242/0x5a0 fs/io_uring.c:2468
 __io_req_complete_post fs/io_uring.c:2572 [inline]
 io_req_complete_post fs/io_uring.c:2582 [inline]
 io_req_complete_failed+0x2d4/0x3b0 fs/io_uring.c:2615
 io_queue_async+0xfe/0x160 fs/io_uring.c:8690
 io_queue_sqe fs/io_uring.c:8734 [inline]
 io_submit_sqe+0x3a17/0x3f50 fs/io_uring.c:8985
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9096
 __do_sys_io_uring_enter fs/io_uring.c:12043 [inline]
 __se_sys_io_uring_enter+0x24b/0xd60 fs/io_uring.c:11969
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11969
 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+0x46/0xb0

read to 0xffff888131a6a250 of 4 bytes by task 2688 on cpu 0:
 __io_cqring_events fs/io_uring.c:2189 [inline]
 io_cqring_events fs/io_uring.c:3193 [inline]
 io_uring_poll+0xc5/0x150 fs/io_uring.c:11224
 vfs_poll include/linux/poll.h:88 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0x6d5/0xca0 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x195/0x1d0 fs/select.c:1101
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1101
 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+0x46/0xb0

value changed: 0x000000cb -> 0x000000d0

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2688 Comm: syz-executor.1 Not tainted 5.19.0-rc6-syzkaller-00026-g5a29232d870d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
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