Laravel.io
<?php

namespace App\Console\Commands;

use Illuminate\Console\Command;
use Illuminate\Database\Eloquent\Model;

class TestMemoryLeak extends Command
{
	protected $signature = 'test:memoryleak';
	protected $description = 'Tests the memory leak that appears since 5d9b363448b9aac83b610166141b8bba9f1807f8';
	private $article;
	
	public function __construct(Article $article)
	{
		parent::__construct();
		$this->article = $article;
	}
	
	public function handle()
	{	
		for($i = 0; $i < 50000; $i++) {
			$article = new $this->article;
			$article->id = $i;
			$article->{$article->getUpdatedAtColumn()} = $article->{$article->getCreatedAtColumn()} = $article->freshTimestampString();
		}
		
		$this->info('used ' . round(memory_get_peak_usage() / 1024 / 1024, 1) . ' MB RAM');
	}
}

class Article extends Model {}

Please note that all pasted data is publicly available.