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BUG: KCSAN: data-race in __io_req_complete_post / io_uring_poll

read-write to 0xffff888138777210 of 4 bytes by task 15729 on cpu 0:
 io_get_cqe_overflow io_uring/io_uring.h:102 [inline]
 io_get_cqe io_uring/io_uring.h:114 [inline]
 __io_fill_cqe_req io_uring/io_uring.h:127 [inline]
 __io_req_complete_post+0x9e/0xb80 io_uring/io_uring.c:855
 io_req_complete_post io_uring/io_uring.c:864 [inline]
 io_req_complete_failed+0xf6/0x1c0 io_uring/io_uring.c:881
 io_req_task_cancel+0x6a/0x70 io_uring/io_uring.c:1250
 handle_tw_list+0x12a/0x180 io_uring/io_uring.c:1037
 tctx_task_work+0x72/0x360 io_uring/io_uring.c:1084
 task_work_run+0xde/0x110 kernel/task_work.c:179
 get_signal+0xaf5/0xc60 kernel/signal.c:2635
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888138777210 of 4 bytes by task 15724 on cpu 1:
 __io_cqring_events io_uring/io_uring.c:176 [inline]
 io_cqring_events io_uring/io_uring.c:1374 [inline]
 io_uring_poll+0xc6/0x1a0 io_uring/io_uring.c:2680
 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+0x63/0xcd

value changed: 0x000000e8 -> 0x000000fc

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15724 Comm: syz-executor.5 Not tainted 6.0.0-syzkaller-11849-g6d84c258e804-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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