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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

read-write to 0xffff888123cda250 of 4 bytes by task 3588 on cpu 0:
 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 fs/io_uring.c:8726 [inline]
 io_submit_sqe+0x3998/0x3eb0 fs/io_uring.c:8977
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9088
 __do_sys_io_uring_enter fs/io_uring.c:12035 [inline]
 __se_sys_io_uring_enter+0x24b/0xd60 fs/io_uring.c:11961
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11961
 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

read to 0xffff888123cda250 of 4 bytes by task 3586 on cpu 1:
 __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: 0x000006b5 -> 0x000006ce

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3586 Comm: syz-executor.0 Not tainted 5.19.0-rc3-syzkaller-00279-g8c23f235a6a8-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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