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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

read-write to 0xffff888134d51a50 of 4 bytes by task 19602 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_async_cancel+0x7d1/0x900 fs/io_uring.c:7939
 io_issue_sqe+0x1852/0xaa00 fs/io_uring.c:8369
 io_queue_sqe fs/io_uring.c:8709 [inline]
 io_submit_sqe+0x2e0f/0x3f30 fs/io_uring.c:8973
 io_submit_sqes+0x27b/0x500 fs/io_uring.c:9084
 __do_sys_io_uring_enter fs/io_uring.c:12031 [inline]
 __se_sys_io_uring_enter+0x24b/0xd60 fs/io_uring.c:11957
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:11957
 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 0xffff888134d51a50 of 4 bytes by task 19600 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:11212
 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: 0x000006f8 -> 0x00000703

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 19600 Comm: syz-executor.0 Not tainted 5.19.0-rc3-syzkaller-00043-g3abc3ae553c7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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