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BUG: KCSAN: data-race in __io_cqring_fill_event / io_cqring_wait

write to 0xffff88813746dc00 of 4 bytes by task 6340 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 0xffff88813746dc00 of 4 bytes by task 6328 on cpu 0:
 io_should_wake fs/io_uring.c:7399 [inline]
 io_cqring_wait_schedule fs/io_uring.c:7444 [inline]
 io_cqring_wait+0x588/0x880 fs/io_uring.c:7512
 __do_sys_io_uring_enter fs/io_uring.c:9865 [inline]
 __se_sys_io_uring_enter+0x62c/0xae0 fs/io_uring.c:9781
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9781
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000000d5 -> 0x000000d6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6328 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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