child_process: ERR_INVALID_ARG_TYPE on .kill()

• Version: Electron v4.2.12 - Node v10.11.0
• Platform: Windows 10 64-bit
• Subsystem: child_process

We are getting the following stack trace when killing a child_process:

root ERROR TypeError [ERR_INVALID_ARG_TYPE]: The "err" argument must be of type number. Received type undefined
    at validateNumber (internal/validators.js:130:11)
    at Object.getSystemErrorName (util.js:1435:3)
    at errnoException (internal/errors.js:303:21)
    at ChildProcess.kill (internal/child_process.js:430:26)

From what I can make of it, it seems to be caused by the following code:

https://github.com/nodejs/node/blob/v10.x/lib/internal/child_process.js#L425-L439

    var err = this._handle.kill(signal);
    if (err === 0) {
      /* Success. */
      this.killed = true;
      return true;
    }
    if (err === UV_ESRCH) {
      /* Already dead. */
    } else if (err === UV_EINVAL || err === UV_ENOSYS) {
      /* The underlying platform doesn't support this signal. */
      throw errnoException(err, 'kill');
    } else {
      /* Other error, almost certainly EPERM. */
      this.emit('error', errnoException(err, 'kill'));
    }

Somehow, err seems to be undefined, making us land in the last else branch, but then errnoException doesn't know what to make out of it and throws the error that we see.

The issue only happens in Electron, so it might not be entirely related to Node, but I was wondering if this err value is expected to be undefined in some circumstance?

lib/internal/child_process.js の参照されている範囲から始め、this._handle.kill(signal) から internal/errors.js、util.js、internal/validators.js を通る err の値を追跡してください。報告されている Electron と Node のバージョンを使って Windows で .kill() の失敗を再現し、その後 undefined を生成するプラットフォーム条件を特定して、期待される動作を文書化またはテストしてください。