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BUG: KCSAN: data-race in io_cqring_overflow_flush / io_submit_sqes

read-write to 0xffff888074b6d844 of 1 bytes by task 20182 on cpu 1:
 io_cqring_overflow_flush+0x8e/0x6b0 fs/io_uring.c:1502
 io_uring_cancel_task_requests+0xad/0x1060 fs/io_uring.c:8517
 io_uring_flush+0xdb/0x1c0 fs/io_uring.c:8662
 filp_close+0x66/0xf0 fs/open.c:1276
 __close_fd+0x177/0x190 fs/file.c:673
 __do_sys_close fs/open.c:1295 [inline]
 __se_sys_close fs/open.c:1293 [inline]
 __x64_sys_close+0x39/0x90 fs/open.c:1293
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888074b6d844 of 1 bytes by task 20250 on cpu 0:
 io_check_restriction fs/io_uring.c:6354 [inline]
 io_init_req fs/io_uring.c:6404 [inline]
 io_submit_sqes+0x673/0x11e0 fs/io_uring.c:6475
 __do_sys_io_uring_enter fs/io_uring.c:8807 [inline]
 __se_sys_io_uring_enter+0x21d/0x990 fs/io_uring.c:8756
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8756
 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: 0 PID: 20250 Comm: syz-executor.5 Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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