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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff888135789070 of 4 bytes by task 3264 on cpu 0:
 io_get_sqe fs/io_uring.c:7322 [inline]
 io_submit_sqes+0x1eb/0x670 fs/io_uring.c:7366
 __do_sys_io_uring_enter fs/io_uring.c:10076 [inline]
 __se_sys_io_uring_enter+0x212/0xb00 fs/io_uring.c:10018
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:10018
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888135789070 of 4 bytes by task 3248 on cpu 1:
 io_sqring_full fs/io_uring.c:1674 [inline]
 io_uring_poll+0x8e/0x146 fs/io_uring.c:9408
 vfs_poll include/linux/poll.h:90 [inline]
 ep_item_poll fs/eventpoll.c:846 [inline]
 ep_send_events fs/eventpoll.c:1685 [inline]
 ep_poll fs/eventpoll.c:1799 [inline]
 do_epoll_wait+0x6b7/0xf40 fs/eventpoll.c:2227
 __do_sys_epoll_wait fs/eventpoll.c:2239 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2234 [inline]
 __x64_sys_epoll_wait+0x119/0x140 fs/eventpoll.c:2234
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000383f -> 0x00003844

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3248 Comm: syz-executor.5 Not tainted 5.16.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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