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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

read-write to 0xffff888108dc0250 of 4 bytes by task 28960 on cpu 1:
 io_get_cqe fs/io_uring.c:2229 [inline]
 __io_fill_cqe_req+0x242/0x5a0 fs/io_uring.c:2464
 __io_req_complete_post fs/io_uring.c:2568 [inline]
 io_req_complete_post fs/io_uring.c:2578 [inline]
 io_req_complete_failed+0x2d4/0x3b0 fs/io_uring.c:2611
 io_queue_async+0xfe/0x160 fs/io_uring.c:8682
 io_queue_sqe+0x140/0x160 fs/io_uring.c:8726
 io_req_task_submit+0x8b/0xb0 fs/io_uring.c:3052
 handle_tw_list fs/io_uring.c:2926 [inline]
 tctx_task_work+0x8d0/0xc10 fs/io_uring.c:2955
 task_work_run+0x8e/0x110 kernel/task_work.c:177
 get_signal+0xeca/0x1020 kernel/signal.c:2634
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:166
 exit_to_user_mode_prepare kernel/entry/common.c:201 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:294
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x46/0xb0

read to 0xffff888108dc0250 of 4 bytes by task 28951 on cpu 0:
 __io_cqring_events fs/io_uring.c:2185 [inline]
 io_cqring_events fs/io_uring.c:3189 [inline]
 io_uring_poll+0xc5/0x150 fs/io_uring.c:11216
 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+0x46/0xb0

value changed: 0x000007fb -> 0x00000807

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28951 Comm: syz-executor.1 Not tainted 5.19.0-rc3-syzkaller-00229-g38bc4ac43168-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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