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BUG: KCSAN: data-race in __io_cqring_fill_event / io_wake_function

write to 0xffff888125189400 of 4 bytes by task 13684 on cpu 1:
 io_get_cqe fs/io_uring.c:1581 [inline]
 __io_cqring_fill_event+0xfb/0x350 fs/io_uring.c:1769
 io_req_complete_post+0x4d/0x640 fs/io_uring.c:1792
 io_issue_sqe+0x446a/0x6300
 io_wq_submit_work+0xf5/0x2c0 fs/io_uring.c:6795
 io_worker_handle_work+0x788/0xa20 fs/io-wq.c:515
 io_wqe_worker+0x1c9/0x5d0 fs/io-wq.c:566
 ret_from_fork+0x1f/0x30

read to 0xffff888125189400 of 4 bytes by task 15128 on cpu 0:
 io_should_wake fs/io_uring.c:7487 [inline]
 io_wake_function+0x36/0x100 fs/io_uring.c:7507
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:108
 __wake_up_common_lock kernel/sched/wait.c:138 [inline]
 __wake_up+0x80/0xc0 kernel/sched/wait.c:157
 io_cqring_ev_posted+0x49/0x220 fs/io_uring.c:1609
 io_req_complete_post+0x332/0x640 fs/io_uring.c:1818
 io_issue_sqe+0x446a/0x6300
 io_wq_submit_work+0xf5/0x2c0 fs/io_uring.c:6795
 io_worker_handle_work+0x788/0xa20 fs/io-wq.c:515
 io_wqe_worker+0x1c9/0x5d0 fs/io-wq.c:566
 ret_from_fork+0x1f/0x30

value changed: 0x000009f5 -> 0x000009f6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15128 Comm: iou-wrk-13648 Tainted: G        W         5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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