some mutators exceptions like wrong randint

[zjuchenyuan]

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Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 801, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 754, in run
    self.__target(*self.__args, **self.__kwargs)
  File "runfuzzer.py", line 753, in main
    gau.create_files(config.POPSIZE - filenum)
  File "/vuzzer64/fuzzer-code/gautils.py", line 230, in create_files
    ch1= ga.mutate(p1,fl)
  File "/vuzzer64/fuzzer-code/operators.py", line 296, in mutate
    result=self.r.choice(self.mutators)(self, original,fl)
  File "/vuzzer64/fuzzer-code/operators.py", line 258, in double_fuzz
    return self.r.choice(self.mutators)(self, result,fl)
  File "/vuzzer64/fuzzer-code/operators.py", line 170, in change_random_full
    cut_pos = self.r.randint(0, size - add_size)
  File "/usr/lib/python2.7/random.py", line 242, in randint
    return self.randrange(a, b+1)
  File "/usr/lib/python2.7/random.py", line 218, in randrange
    raise ValueError, "empty range for randrange() (%d,%d, %d)" % (istart, istop, width)
ValueError: empty range for randrange() (0,0, 0)

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[zjuchenyuan]

I would suggest change mutate function, adding try-except:

    def mutate(self, original,fl):
        try:
            result=self.r.choice(self.mutators)(self, original,fl)
        except:
            print("[error] mutate1: self.r.choice(self.mutators)(self, original,fl)")
            traceback.print_exc()
            result = original
        while len(result)<3:
            try:
                result= self.r.choice(self.mutators)(self, original,fl)
            except:
                print("[error] mutate2: self.r.choice(self.mutators)(self, original,fl)")
                traceback.print_exc()
                result = original
        assert len(result)>2, "elimination failed to reduce size %d" % (len(result),)
        return result