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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

read-write to 0xffff8881075e0250 of 4 bytes by task 18043 on cpu 0:
 io_get_cqe fs/io_uring.c:2177 [inline]
 __io_fill_cqe fs/io_uring.c:2408 [inline]
 __io_fill_cqe_req+0x10e/0x270 fs/io_uring.c:2470
 __io_req_complete_post fs/io_uring.c:2548 [inline]
 io_req_complete_post fs/io_uring.c:2565 [inline]
 io_req_complete_failed+0x28f/0x360 fs/io_uring.c:2623
 io_queue_async+0xfe/0x150 fs/io_uring.c:8676
 io_queue_sqe fs/io_uring.c:8719 [inline]
 io_submit_sqe+0x36ad/0x3ac0 fs/io_uring.c:8968
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9079
 __do_sys_io_uring_enter fs/io_uring.c:12008 [inline]
 __se_sys_io_uring_enter+0x2d9/0xdd0 fs/io_uring.c:11934
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11934
 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+0x44/0xae

read to 0xffff8881075e0250 of 4 bytes by task 18040 on cpu 1:
 __io_cqring_events fs/io_uring.c:2133 [inline]
 io_cqring_events fs/io_uring.c:3207 [inline]
 io_uring_poll+0xc5/0x150 fs/io_uring.c:11189
 vfs_poll include/linux/poll.h:88 [inline]
 do_select+0x951/0x1020 fs/select.c:538
 core_sys_select+0x368/0x520 fs/select.c:681
 do_pselect fs/select.c:763 [inline]
 __do_sys_pselect6+0x1f4/0x250 fs/select.c:804
 __se_sys_pselect6 fs/select.c:795 [inline]
 __x64_sys_pselect6+0x74/0x80 fs/select.c:795
 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+0x44/0xae

value changed: 0x00000002 -> 0x00000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 18040 Comm: syz-executor.0 Not tainted 5.18.0-syzkaller-00511-g140e40e39a29-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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