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BUG: KCSAN: data-race in __io_cqring_fill_event / io_wake_function

write to 0xffff88813080a400 of 4 bytes by task 10840 on cpu 0:
 io_get_cqe fs/io_uring.c:1424 [inline]
 __io_cqring_fill_event+0xfb/0x350 fs/io_uring.c:1606
 io_req_complete_post+0x55/0x5c0 fs/io_uring.c:1630
 io_issue_sqe+0x3a66/0x64b0 fs/io_uring.c:4282
 io_wq_submit_work+0x113/0x1f0 fs/io_uring.c:6307
 io_worker_handle_work+0x8cb/0xaf0 fs/io-wq.c:525
 io_wqe_worker+0x184/0x4b0 fs/io-wq.c:574
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

read to 0xffff88813080a400 of 4 bytes by task 10835 on cpu 1:
 __io_cqring_events fs/io_uring.c:1408 [inline]
 io_cqring_events fs/io_uring.c:2197 [inline]
 io_should_wake fs/io_uring.c:6992 [inline]
 io_wake_function+0x40/0x130 fs/io_uring.c:7006
 __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+0x4c/0x220 fs/io_uring.c:1443
 io_req_complete_post+0x3eb/0x5c0 fs/io_uring.c:1656
 io_issue_sqe+0x3a66/0x64b0 fs/io_uring.c:4282
 io_wq_submit_work+0x113/0x1f0 fs/io_uring.c:6307
 io_worker_handle_work+0x8cb/0xaf0 fs/io-wq.c:525
 io_wqe_worker+0x184/0x4b0 fs/io-wq.c:574
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

value changed: 0x0000052b -> 0x0000052c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10835 Comm: iou-wrk-10827 Tainted: G        W         5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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