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BUG: KCSAN: data-race in __io_cqring_fill_event / io_uring_poll

write to 0xffff88814716e400 of 4 bytes by task 8045 on cpu 0:
 io_get_cqe fs/io_uring.c:1583 [inline]
 __io_cqring_fill_event+0xfb/0x350 fs/io_uring.c:1767
 io_cqring_fill_event+0x28/0x30 fs/io_uring.c:1781
 __io_poll_complete fs/io_uring.c:5344 [inline]
 io_poll_task_func+0x2f4/0x650 fs/io_uring.c:5378
 tctx_task_work+0x275/0x4d0 fs/io_uring.c:2159
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:214 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0xf8/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88814716e400 of 4 bytes by task 8043 on cpu 1:
 __io_cqring_events fs/io_uring.c:1567 [inline]
 io_cqring_events fs/io_uring.c:2383 [inline]
 io_uring_poll+0xc6/0x150 fs/io_uring.c:9337
 vfs_poll include/linux/poll.h:90 [inline]
 io_poll_rewait fs/io_uring.c:5283 [inline]
 io_poll_task_func+0x131/0x650 fs/io_uring.c:5369
 tctx_task_work+0x275/0x4d0 fs/io_uring.c:2159
 task_work_run+0xae/0x130 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:214 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0xf8/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000003e8 -> 0x000003f3

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8043 Comm: syz-executor.4 Tainted: G        W         5.15.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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