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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

read-write to 0xffff8881386ca070 of 4 bytes by task 10438 on cpu 1:
 io_get_sqe fs/io_uring.c:7801 [inline]
 io_submit_sqes+0x1ee/0x7e0 fs/io_uring.c:7845
 __do_sys_io_uring_enter fs/io_uring.c:10797 [inline]
 __se_sys_io_uring_enter+0x2cb/0xc70 fs/io_uring.c:10723
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:10723
 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

read to 0xffff8881386ca070 of 4 bytes by task 10427 on cpu 0:
 io_sqring_full fs/io_uring.c:1799 [inline]
 io_uring_poll+0x8d/0x150 fs/io_uring.c:9981
 vfs_poll include/linux/poll.h:88 [inline]
 ep_item_poll fs/eventpoll.c:853 [inline]
 ep_send_events fs/eventpoll.c:1692 [inline]
 ep_poll fs/eventpoll.c:1806 [inline]
 do_epoll_wait+0x717/0xf10 fs/eventpoll.c:2234
 __do_sys_epoll_wait fs/eventpoll.c:2246 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2241 [inline]
 __x64_sys_epoll_wait+0x119/0x140 fs/eventpoll.c:2241
 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: 0x00002d32 -> 0x00002d5e

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10427 Comm: syz-executor.3 Not tainted 5.18.0-rc3-syzkaller-00007-g559089e0a93d-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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