Suddenly, this error occurred in nodeJS [EBADF]

[nodemon] starting ts-node -r tsconfig-paths/register -r dotenv/config app.ts
Error: accept EBADF at TCP.onconnection (node:net:1594:24) {
    errno: -9,
    code: 'EBADF',
    syscall: 'accept'
}
[nodemon] app crashed - waiting for file changes before starting...

[ version ]
node: v16.15.0
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An error occurs when requesting.
Four months ago it worked without any problems.
I have a file read code with fs and I don’t use a socket.

const options = {
    key: fs.readFileSync('/etc/letsencrypt/live/test.pem'),
    cert: fs.readFileSync('/etc/letsencrypt/live/test.pem'),
    ca: fs.readFileSync('/etc/letsencrypt/live/test.pem'),
};

It just happened out of the blue
Failed to even try debug.