Denial of service with malformed xml

[Google-Autofuzz]

When running the following code with the latest git version of pygments on the attached input results of in 100% CPU consumption for an arbitrary long time:

import sys

import pygments
import pygments.formatters
import pygments.lexers

with open(sys.argv[1], 'rb') as f:
    data = f.read()
    lexer = pygments.lexers.guess_lexer(str(data))
    pygments.highlight(str(data), lexer, pygments.formatters.HtmlFormatter())

pygments.txt

[Anteru]

Fixed, thanks for the report! Short summery for those who are curious as to what is going on: This is not a bug in the Xml lexer, but the XmlErb lexer which kicks in (the Xml lexer has no problem with the file), and that in turn uses Ruby for embedded template code, and the Ruby lexer failed on single-quote strings with lots of backslashes :)