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BUG: KCSAN: data-race in __io_fill_cqe / io_uring_poll

write to 0xffff88813be54a00 of 4 bytes by task 11984 on cpu 1:
 io_get_cqe fs/io_uring.c:1731 [inline]
 __io_fill_cqe+0xf9/0x380 fs/io_uring.c:1921
 __io_req_complete_post+0x6c/0x420 fs/io_uring.c:1950
 io_req_complete_post fs/io_uring.c:1978 [inline]
 io_req_task_complete+0x103/0x3d0 fs/io_uring.c:2845
 handle_tw_list fs/io_uring.c:2334 [inline]
 tctx_task_work+0x8b2/0xc90 fs/io_uring.c:2368
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:213 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x102/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813be54a00 of 4 bytes by task 11992 on cpu 0:
 __io_cqring_events fs/io_uring.c:1715 [inline]
 io_cqring_events fs/io_uring.c:2586 [inline]
 io_uring_poll+0xc6/0x146 fs/io_uring.c:9464
 vfs_poll include/linux/poll.h:90 [inline]
 __io_arm_poll_handler+0x19d/0x8a0 fs/io_uring.c:5719
 io_arm_poll_handler+0x1fb/0x360 fs/io_uring.c:5803
 io_queue_sqe_arm_apoll fs/io_uring.c:7034 [inline]
 __io_queue_sqe+0x1a3/0x6a0 fs/io_uring.c:7072
 io_queue_sqe+0x46/0x550 fs/io_uring.c:7099
 io_submit_sqe+0x796/0x4b34 fs/io_uring.c:7307
 io_submit_sqes+0x25f/0x560 fs/io_uring.c:7413
 __do_sys_io_uring_enter fs/io_uring.c:10108 [inline]
 __se_sys_io_uring_enter+0x212/0xb00 fs/io_uring.c:10050
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:10050
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000023e -> 0x00000244

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11992 Comm: syz-executor.3 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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