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BUG: KCSAN: data-race in __do_sys_io_uring_register / io_sqe_buffers_register

write to 0xffff8881464b409c of 4 bytes by task 10457 on cpu 1:
 io_sqe_buffers_register+0x373/0x8f0 fs/io_uring.c:8496
 __io_uring_register fs/io_uring.c:10129 [inline]
 __do_sys_io_uring_register+0x474/0x1ea0 fs/io_uring.c:10254
 __se_sys_io_uring_register fs/io_uring.c:10234 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:10234
 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 0xffff8881464b409c of 4 bytes by task 10451 on cpu 0:
 __do_sys_io_uring_register+0x1d2/0x1ea0 fs/io_uring.c:10256
 __se_sys_io_uring_register fs/io_uring.c:10234 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:10234
 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: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10451 Comm: syz-executor.4 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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