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BUG: KCSAN: data-race in __io_fill_cqe_req / io_wake_function

write to 0xffff888137ef5a00 of 4 bytes by task 8779 on cpu 0:
 io_get_cqe fs/io_uring.c:1820 [inline]
 __io_fill_cqe fs/io_uring.c:2030 [inline]
 __io_fill_cqe_req+0x129/0x3a0 fs/io_uring.c:2043
 __io_req_complete_post+0x65/0x580 fs/io_uring.c:2066
 io_req_complete_post fs/io_uring.c:2100 [inline]
 __io_req_complete fs/io_uring.c:2120 [inline]
 __io_complete_rw fs/io_uring.c:2999 [inline]
 kiocb_done+0x2ec/0x640 fs/io_uring.c:3224
 io_read fs/io_uring.c:3932 [inline]
 io_issue_sqe+0x63e9/0x8670 fs/io_uring.c:7130
 io_wq_submit_work+0x249/0x2d0 fs/io_uring.c:7305
 io_worker_handle_work+0x517/0xc50 fs/io-wq.c:597
 io_wqe_worker+0x1d1/0x940 fs/io-wq.c:644
 ret_from_fork+0x1f/0x30

read to 0xffff888137ef5a00 of 4 bytes by task 8780 on cpu 1:
 io_should_wake fs/io_uring.c:8069 [inline]
 io_wake_function+0x36/0x100 fs/io_uring.c:8089
 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:107
 __wake_up_common_lock kernel/sched/wait.c:137 [inline]
 __wake_up+0x80/0xc0 kernel/sched/wait.c:156
 io_cqring_wake fs/io_uring.c:1859 [inline]
 io_cqring_ev_posted fs/io_uring.c:1875 [inline]
 io_req_complete_post fs/io_uring.c:2103 [inline]
 __io_req_complete fs/io_uring.c:2120 [inline]
 __io_complete_rw fs/io_uring.c:2999 [inline]
 kiocb_done+0x394/0x640 fs/io_uring.c:3224
 io_read fs/io_uring.c:3932 [inline]
 io_issue_sqe+0x63e9/0x8670 fs/io_uring.c:7130
 io_wq_submit_work+0x249/0x2d0 fs/io_uring.c:7305
 io_worker_handle_work+0x517/0xc50 fs/io-wq.c:597
 io_wqe_worker+0x1d1/0x940 fs/io-wq.c:644
 ret_from_fork+0x1f/0x30

value changed: 0x0000003b -> 0x0000003c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8780 Comm: iou-wrk-8771 Not tainted 5.18.0-rc3-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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