我们今天早上有同样的问题。它似乎与上周末的bash更新有关。

We had the exact same problem this morning. It seems it has something to do with the bash update from last weekend.

我们通过重新启动apache解决了这个问题。

We fixed the problem by simply restarting apache.

编辑：

有关bash更新的详细信息，您还可以检查 http://www.troyhunt.com/2014/09/everything-you-need-to-know-about.html a>

For more information about the bash update you can also check http://www.troyhunt.com/2014/09/everything-you-need-to-know-about.html