This is a meta-tag, and it and its brethren should be blacklisted. They don't classify anything atomically, and by themselves they don't mean anything; they must be used with another tag. We don't like meta-tags around these parts, so they should go.

 - [tag:fail]  13 questions
 - [tag:crash] 172 questions
 - [tag:error] 66 questions
 - [tag:fault] 12 questions

Because of their recurring nature, they should be put on the tag blacklist like [tag:vmware] is.