实际上，这是一个钥匙串的错误，你可以搜索它在github。

Actually, this is a bug of keychain, you can search it at github.

Github 34018问题

几个月前，一些苹果公司的员工来到我们这里公司给我们一个课程，当然，我们问了这个问题，他们也没给我们一个解决方案

A few months ago, some apple's staff came our company to give us a course, after course,we asked this question, they also did't give us a solution