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BUG: KCSAN: data-race in __io_cqring_fill_event / io_wake_function

write to 0xffff88810978d400 of 4 bytes by task 25434 on cpu 1:
 io_get_cqe fs/io_uring.c:1580 [inline]
 __io_cqring_fill_event+0xfb/0x350 fs/io_uring.c:1765
 io_req_complete_post+0x4d/0x640 fs/io_uring.c:1788
 io_issue_sqe+0x5b4b/0x6270 fs/io_uring.c:6019
 io_wq_submit_work+0xf5/0x2c0 fs/io_uring.c:6707
 io_worker_handle_work+0x97d/0xba0 fs/io-wq.c:560
 io_wqe_worker+0x184/0x4b0 fs/io-wq.c:609
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff88810978d400 of 4 bytes by task 26619 on cpu 0:
 io_should_wake fs/io_uring.c:7399 [inline]
 io_wake_function+0x36/0x100 fs/io_uring.c:7419
 __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:1608
 io_req_complete_post+0x332/0x640 fs/io_uring.c:1814
 io_issue_sqe+0x5b4b/0x6270 fs/io_uring.c:6019
 io_wq_submit_work+0xf5/0x2c0 fs/io_uring.c:6707
 io_worker_handle_work+0x97d/0xba0 fs/io-wq.c:560
 io_wqe_worker+0x184/0x4b0 fs/io-wq.c:609
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

value changed: 0x00001a5f -> 0x00001a60

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26619 Comm: iou-wrk-23365 Tainted: G        W         5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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