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**Do you want to request a *feature* or report a *bug*?**

Bug

**What is the current behavior?**

See fiddle https://jsfiddle.net/j2nzg31L/1/

The warning related to the select fires repeatedly.  @gaearon tells me it should dedupe, and that this is a bug.

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template for React 16: https://jsfiddle.net/Luktwrdm/, template for React 15: https://jsfiddle.net/hmbg7e9w/).**

See above

**What is the expected behavior?**

See above

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

16.2
state = {
        value: 'giraffe',
      };
      componentDidMount() {
        this._renderNested();
      }
      componentDidUpdate() {
        this._renderNested();
      }
      _handleChange(event) {
        this.setState({value: event.target.value});
      }
      _renderNested() {
        ReactDOM.render(
          <select
            onChange={this._handleChange.bind(this)}
            ref={n => (selectNode = n)}
            value={this.state.value}>
            <option value="monkey">A monkey!</option>
            <option value="giraffe">A giraffe!</option>
            <option value="gorilla">A gorilla!</option>
          </select>,
          this._nestingContainer,
        );
      }
      render() {