http://www.v2ex.com/settings/avatar 上传头像错误

Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/tornado/web.py", line 1042, in _execute
getattr(self, self.request.method.lower())(*args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/tornado/web.py", line 1809, in wrapper
return method(self, *args, **kwargs)
File "/www/v2ex/galaxy/handlers/web/settings.py", line 373, in post
avatar73 = self.rescale(avatar, 73, 73)
File "/www/v2ex/galaxy/handlers/__init__.py", line 451, in rescale
img = img.crop((int(x_offset), int(y_offset), int(x_offset)+int(crop_width), int(y_offset)+int(crop_height)))
File "/usr/lib/python2.7/dist-packages/PIL/Image.py", line 763, in crop
self.load()
File "/usr/lib/python2.7/dist-packages/PIL/ImageFile.py", line 201, in load
raise IOError("image file is truncated (%d bytes not processed)" % len(b))
IOError: image file is truncated (5 bytes not processed)