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BUG: KCSAN: data-race in __do_sys_io_uring_register / io_sqe_files_register

write to 0xffff888107be6bd8 of 4 bytes by task 20405 on cpu 0:
 io_sqe_files_register+0x64d/0xa80 fs/io_uring.c:7645
 __io_uring_register fs/io_uring.c:9995 [inline]
 __do_sys_io_uring_register+0x60d/0x1920 fs/io_uring.c:10091
 __se_sys_io_uring_register fs/io_uring.c:10071 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:10071
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888107be6bd8 of 4 bytes by task 20365 on cpu 1:
 __do_sys_io_uring_register+0x1eb/0x1920 fs/io_uring.c:10093
 __se_sys_io_uring_register fs/io_uring.c:10071 [inline]
 __x64_sys_io_uring_register+0x4f/0x60 fs/io_uring.c:10071
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 20365 Comm: syz-executor.3 Tainted: G        W         5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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