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BUG: KCSAN: data-race in __io_fill_cqe_req / io_uring_poll

write to 0xffff888137e6da00 of 4 bytes by task 22105 on cpu 1:
 io_get_cqe fs/io_uring.c:1820 [inline]
 __io_fill_cqe fs/io_uring.c:2030 [inline]
 __io_fill_cqe_req+0x129/0x3a0 fs/io_uring.c:2043
 __io_submit_flush_completions fs/io_uring.c:2670 [inline]
 io_submit_flush_completions+0xef/0x340 fs/io_uring.c:1265
 tctx_task_work+0xd1/0xa30 fs/io_uring.c:2480
 task_work_run+0x8e/0x110 kernel/task_work.c:164
 get_signal+0xeca/0x1020 kernel/signal.c:2641
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:867
 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+0x44/0xae

read to 0xffff888137e6da00 of 4 bytes by task 22100 on cpu 0:
 __io_cqring_events fs/io_uring.c:1804 [inline]
 io_cqring_events fs/io_uring.c:2725 [inline]
 io_uring_poll+0xc5/0x150 fs/io_uring.c:9997
 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+0x44/0xae

value changed: 0x000002cb -> 0x000002d6

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22100 Comm: syz-executor.0 Not tainted 5.18.0-rc3-syzkaller-00080-gd569e86915b7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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