ObjectFormatException: Unknown field b'>'
(6 additional frame(s) were not displayed)
...
  File "dulwich/pack.py", line 1476, in _result
    return unpacked.sha_file()
  File "dulwich/pack.py", line 166, in sha_file
    return ShaFile.from_raw_chunks(self.obj_type_num, self.obj_chunks)
  File "dulwich/objects.py", line 456, in from_raw_chunks
    obj.set_raw_chunks(chunks, sha)
  File "dulwich/objects.py", line 356, in set_raw_chunks
    self._deserialize(chunks)
  File "dulwich/objects.py", line 832, in _deserialize
    raise ObjectFormatException("Unknown field %s" % field)

Loading failure, updating to `failed` status

$ git clone https://bitbucket.org/cacotopia/cacotopia.git
$ cd cacotopia
$ git cat-file -p commit_message
object 1319800c18ca5ea54d8068828308ff82fbede0e5
type commit
tag commit_message
tagger cacotopia
 <sinosie7en@gmail.com
> 1372081650 +0800

commit message