今天大多时候用的好好的，突然就出现了
sudo: 3 incorrect password attempts
详情如下：
~$ sudo -i
Sorry, try again.
Sorry, try again.
Sorry, try again.
sudo: 3 incorrect password attempts
希望高手能指点一下这是什么原因导致或者告知一下诊断的方法。
补充：
http://unix.stackexchange.com/questions/9218/why-does-my-sudo-ask-for-password-only-once-but-evaluate-thrice
链接的页面和我遇到的情况很相似，也有人进行了重现和深入的解答，但是我的英语水平和对linux理解有限，没看明白说的是什么，希望看懂的人能高速我一下。
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Did your arm hit the keyboard?
http://serverfault.com/questions/543888/sudo-does-not-prompt-for-password-and-reports-3-incorrect-password-attempts
The prompt indicates that the password was entered incorrectly
I have also encountered this problem and I don’t know how to solve it yet
I have solved it.
Solution:
You need to find a quick machine
Check the file contents in the /etc/pam.d/ folder.
Usually the system-auth-ac or system-auth configuration is unreasonable;
After modification ok
Clear the number of incorrect inputs by your user
Use the command pam_tally2
Study the specific usage yourself