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BUG: KCSAN: data-race in __io_free_req / __io_uring_files_cancel

write to 0xffff88810a548e28 of 1 bytes by task 21415 on cpu 1:
 __io_uring_files_cancel+0x5c/0x1310 fs/io_uring.c:8710
 io_uring_files_cancel include/linux/io_uring.h:50 [inline]
 exit_files+0x6a/0xc0 fs/file.c:456
 do_exit+0x3ed/0x15a0 kernel/exit.c:801
 do_group_exit+0xc8/0x170 kernel/exit.c:903
 get_signal+0xf9b/0x1510 kernel/signal.c:2757
 arch_do_signal+0x25/0x260 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0xde/0x170 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x16/0x30 kernel/entry/common.c:266
 do_syscall_64+0x45/0x80 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88810a548e28 of 1 bytes by task 21423 on cpu 0:
 __io_free_req+0x7e/0x220 fs/io_uring.c:1838
 io_free_req fs/io_uring.c:2084 [inline]
 io_put_req fs/io_uring.c:2169 [inline]
 io_free_work+0x44/0x80 fs/io_uring.c:7662
 io_worker_handle_work+0xdc0/0xf90 fs/io-wq.c:576
 io_wqe_worker+0x202/0x810 fs/io-wq.c:610
 kthread+0x1fa/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21423 Comm: io_wqe_worker-0 Not tainted 5.10.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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