Laravel：Symfony \ Component \ Process \ Exception \ RuntimeException：该过程已通过信号＆＃34; 6＆＃34;

Question

每当我跑步时 "php artisan make:migration create_team_table --create=team"
创建迁移文件然后我得到这个输出：

Created Migration: 2018_05_09_115803_create_team_table

Symfony\Component\Process\Exception\RuntimeException  : The process has been signaled with signal "6".

/home/webdev/public_html/vendor/symfony/process/Process.php: 392


       if ($this->processInformation['signaled'] && $this->processInformation['termsig'] !== $this->latestSignal) {
           throw new RuntimeException(sprintf('The process has been signaled with signal "%s".', $this->processInformation['termsig']));
       }

       return $this->exitcode;
   }

异常追踪：

1   Symfony\Component\Process\Process::wait()
      /home/webdev/public_html/vendor/symfony/process/Process.php : 201

  2   Symfony\Component\Process\Process::run()
      /home/webdev/public_html/vendor/laravel/framework/src/Illuminate/Support/Composer.php : 50

请使用参数-v查看更多详细信息。

有谁能告诉我为什么我会得到那个运行时异常？