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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff88812fc00850 of 4 bytes by task 16721 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/0x10d0 fs/io_uring.c:6864
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff88812fc00850 of 4 bytes by task 16718 on cpu 1:
 io_sqring_full fs/io_uring.c:1358 [inline]
 io_uring_poll+0x94/0x160 fs/io_uring.c:8647
 vfs_poll include/linux/poll.h:90 [inline]
 __io_arm_poll_handler+0x195/0x460 fs/io_uring.c:5118
 io_poll_add+0x68/0x510 fs/io_uring.c:5402
 io_issue_sqe+0xc7c/0x6750 fs/io_uring.c:6126
 __io_queue_sqe+0xe9/0x360 fs/io_uring.c:6414
 io_queue_sqe fs/io_uring.c:6463 [inline]
 io_submit_sqe+0x1887/0x3360 fs/io_uring.c:6626
 io_submit_sqes+0x5bd/0xbd0 fs/io_uring.c:6734
 __io_sq_thread fs/io_uring.c:6793 [inline]
 io_sq_thread+0x74d/0x10d0 fs/io_uring.c:6864
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

value changed: 0x00005bb0 -> 0x00005bb5

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16718 Comm: iou-sqp-16713 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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