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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff88812897e850 of 4 bytes by task 23691 on cpu 0:
 io_get_sqe fs/io_uring.c:6693 [inline]
 io_submit_sqes+0x544/0xbd0 fs/io_uring.c:6727
 __io_sq_thread fs/io_uring.c:6793 [inline]
 io_sq_thread+0x74d/0x10b0 fs/io_uring.c:6864
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88812897e850 of 4 bytes by task 23690 on cpu 1:
 io_sqring_full fs/io_uring.c:1358 [inline]
 io_uring_poll+0x94/0x160 fs/io_uring.c:8646
 vfs_poll include/linux/poll.h:90 [inline]
 do_select+0x901/0xf80 fs/select.c:534
 core_sys_select+0x403/0x690 fs/select.c:677
 kern_select fs/select.c:718 [inline]
 __do_sys_select fs/select.c:725 [inline]
 __se_sys_select+0x17e/0x1c0 fs/select.c:722
 __x64_sys_select+0x63/0x70 fs/select.c:722
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 23690 Comm: syz-executor.1 Tainted: G        W         5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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