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BUG: KCSAN: data-race in __io_req_complete_post / io_uring_poll

read-write to 0xffff8881203e8a10 of 4 bytes by task 25811 on cpu 0:
 io_get_cqe_overflow io_uring/io_uring.h:102 [inline]
 io_get_cqe io_uring/io_uring.h:114 [inline]
 __io_fill_cqe_req io_uring/io_uring.h:127 [inline]
 __io_req_complete_post+0x9e/0xb80 io_uring/io_uring.c:855
 io_req_complete_post io_uring/io_uring.c:864 [inline]
 io_issue_sqe+0x432/0x900 io_uring/io_uring.c:1753
 io_wq_submit_work+0x3d3/0x570 io_uring/io_uring.c:1818
 io_worker_handle_work+0x545/0xc00 io_uring/io-wq.c:587
 io_wqe_worker+0x210/0x8f0 io_uring/io-wq.c:632
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

read to 0xffff8881203e8a10 of 4 bytes by task 25795 on cpu 1:
 __io_cqring_events io_uring/io_uring.c:176 [inline]
 io_cqring_events io_uring/io_uring.c:1375 [inline]
 io_uring_poll+0xc6/0x1a0 io_uring/io_uring.c:2678
 vfs_poll include/linux/poll.h:88 [inline]
 do_pollfd fs/select.c:873 [inline]
 do_poll fs/select.c:921 [inline]
 do_sys_poll+0x6d5/0xca0 fs/select.c:1015
 __do_sys_ppoll fs/select.c:1121 [inline]
 __se_sys_ppoll+0x195/0x1d0 fs/select.c:1101
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1101
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000494 -> 0x00000499

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 25795 Comm: syz-executor.3 Not tainted 6.1.0-rc1-syzkaller-00025-gaae703b02f92-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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