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BUG: KCSAN: data-race in io_submit_sqes / io_uring_poll

write to 0xffff88812c2c4070 of 4 bytes by task 4688 on cpu 1:
 io_get_sqe fs/io_uring.c:6723 [inline]
 io_submit_sqes+0x7b4/0xe50 fs/io_uring.c:6775
 __do_sys_io_uring_enter fs/io_uring.c:9389 [inline]
 __se_sys_io_uring_enter+0x20c/0xb20 fs/io_uring.c:9332
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812c2c4070 of 4 bytes by task 4682 on cpu 0:
 io_sqring_full fs/io_uring.c:1403 [inline]
 io_uring_poll+0x8e/0x150 fs/io_uring.c:8728
 vfs_poll include/linux/poll.h:90 [inline]
 do_pollfd fs/select.c:869 [inline]
 do_poll fs/select.c:917 [inline]
 do_sys_poll+0x622/0xc00 fs/select.c:1011
 __do_sys_ppoll fs/select.c:1117 [inline]
 __se_sys_ppoll+0x169/0x1b0 fs/select.c:1097
 __x64_sys_ppoll+0x63/0x70 fs/select.c:1097
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x000006a5 -> 0x000006b7

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4682 Comm: syz-executor.1 Not tainted 5.14.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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