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BUG: KCSAN: data-race in io_cqring_overflow_flush / io_submit_sqe

write to 0xffff888066b7a844 of 1 bytes by task 28172 on cpu 0:
 io_cqring_overflow_flush+0x99/0x6c0 fs/io_uring.c:1502
 io_uring_cancel_task_requests+0xab/0xfe0 fs/io_uring.c:8511
 io_uring_flush+0xdb/0x1c0 fs/io_uring.c:8656
 filp_close+0x66/0xf0 fs/open.c:1276
 __close_fd+0x173/0x190 fs/file.c:673
 __do_sys_close fs/open.c:1295 [inline]
 __se_sys_close fs/open.c:1293 [inline]
 __x64_sys_close+0x3b/0x80 fs/open.c:1293
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888066b7a844 of 1 bytes by task 28174 on cpu 1:
 io_submit_sqe+0xdc/0x660 fs/io_uring.c:6243
 io_submit_sqes+0xa58/0x1210 fs/io_uring.c:6479
 __do_sys_io_uring_enter fs/io_uring.c:8801 [inline]
 __se_sys_io_uring_enter+0x21d/0x990 fs/io_uring.c:8750
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:8750
 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: 28174 Comm: syz-executor.3 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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