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BUG: KCSAN: data-race in io_cqring_overflow_flush / io_submit_sqe

read-write to 0xffff888024641844 of 1 bytes by task 7914 on cpu 0:
 io_cqring_overflow_flush+0x90/0x7f0 fs/io_uring.c:1645
 io_uring_cancel_task_requests fs/io_uring.c:8644 [inline]
 __io_uring_files_cancel+0x21a/0xff0 fs/io_uring.c:8742
 io_uring_files_cancel include/linux/io_uring.h:51 [inline]
 exit_files+0x6a/0xc0 fs/file.c:456
 do_exit+0x422/0x15a0 kernel/exit.c:804
 do_group_exit+0xc8/0x170 kernel/exit.c:906
 get_signal+0xf9b/0x1510 kernel/signal.c:2758
 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 0xffff888024641844 of 1 bytes by task 7944 on cpu 1:
 io_submit_sqe+0xd9/0x620 fs/io_uring.c:6339
 io_submit_sqes+0x99a/0x11a0 fs/io_uring.c:6581
 __do_sys_io_uring_enter fs/io_uring.c:8958 [inline]
 __se_sys_io_uring_enter+0x52c/0xac0 fs/io_uring.c:8907
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8907
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7944 Comm: syz-executor.1 Not tainted 5.10.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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