bzrlib.errors.BzrCheckError: Internal check failed: Cannot add revision(s) to repository: missing chk node(s) for id_to_entry maps

$ bzr get bzr+ssh://svn.twistedmatrix.com/~exarkun/dns-comp-loop-5064
bzr: ERROR: bzrlib.errors.BzrCheckError: Internal check failed: Cannot add revision(s) to repository: missing chk node(s) for id_to_entry maps

Traceback (most recent call last):
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 926, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 1126, in run_bzr
    ret = run(*run_argv)
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 691, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/Library/Python/2.6/site-packages/bzrlib/commands.py", line 713, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/builtins.py", line 1227, in run
    source_branch=br_from)
  File "/Library/Python/2.6/site-packages/bzrlib/controldir.py", line 374, in sprout
    create_tree_if_local=create_tree_if_local)
  File "/Library/Python/2.6/site-packages/bzrlib/cleanup.py", line 131, in run
    self.cleanups, self.func, self, *args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/controldir.py", line 425, in _sprout
    result_repo.fetch(source_repository, revision_id=revision_id)
  File "/Library/Python/2.6/site-packages/bzrlib/repository.py", line 1781, in fetch
    find_ghosts=find_ghosts, fetch_spec=fetch_spec)
  File "/Library/Python/2.6/site-packages/bzrlib/decorators.py", line 194, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/Library/Python/2.6/site-packages/bzrlib/repository.py", line 3437, in fetch
    find_ghosts=find_ghosts)
  File "/Library/Python/2.6/site-packages/bzrlib/fetch.py", line 73, in __init__
    self.__fetch()
  File "/Library/Python/2.6/site-packages/bzrlib/fetch.py", line 99, in __fetch
    self._fetch_everything_for_search(search)
  File "/Library/Python/2.6/site-packages/bzrlib/fetch.py", line 127, in _fetch_everything_for_search
    stream, from_format, [])
  File "/Library/Python/2.6/site-packages/bzrlib/repository.py", line 4105, in insert_stream
    hint = self.target_repo.commit_write_group()
  File "/Library/Python/2.6/site-packages/bzrlib/repository.py", line 1640, in commit_write_group
    result = self._commit_write_group()
  File "/Library/Python/2.6/site-packages/bzrlib/repofmt/pack_repo.py", line 2333, in _commit_write_group
    hint = self._pack_collection._commit_write_group()
  File "/Library/Python/2.6/site-packages/bzrlib/repofmt/pack_repo.py", line 2171, in _commit_write_group
    "Cannot add revision(s) to repository: " + problems_summary)
BzrCheckError: Internal check failed: Cannot add revision(s) to repository: missing chk node(s) for id_to_entry maps

bzr 2.3.1 on python 2.6.1 (Darwin-10.7.0-i386-64bit)
arguments: ['/usr/local/bin/bzr', 'get', 'bzr+ssh://svn.twistedmatrix.com/~exarkun/dns-comp-loop-5064']
encoding: 'UTF-8', fsenc: 'utf-8', lang: 'en_US.UTF-8'
plugins:
  bash_completion /Library/Python/2.6/site-packages/bzrlib/plugins/bash_completion [2.3.1]
  bisect /Domicile/glyph/.bazaar/plugins/bisect [1.1.0dev]
  bzrtools /Library/Python/2.6/site-packages/bzrlib/plugins/bzrtools [2.3.1]
  colo /Library/Python/2.6/site-packages/bzrlib/plugins/colo [0.2.1]
  email /Library/Python/2.6/site-packages/bzrlib/plugins/email [unknown]
  explorer /Library/Python/2.6/site-packages/bzrlib/plugins/explorer [1.1.2]
  extmerge /Library/Python/2.6/site-packages/bzrlib/plugins/extmerge [unknown]
  fastimport /Library/Python/2.6/site-packages/bzrlib/plugins/fastimport [0.10.0]
  keychain /Library/Python/2.6/site-packages/bzrlib/plugins/keychain [0.1.0]
  launchpad /Library/Python/2.6/site-packages/bzrlib/plugins/launchpad [2.3.1]
  loom /Library/Python/2.6/site-packages/bzrlib/plugins/loom [2.2.1dev]
  netrc_credential_store /Library/Python/2.6/site-packages/bzrlib/plugins/netrc_credential_store [2.3.1]
  news_merge /Library/Python/2.6/site-packages/bzrlib/plugins/news_merge [2.3.1]
  pipeline /Library/Python/2.6/site-packages/bzrlib/plugins/pipeline [1.1.0]
  push_and_update /Domicile/glyph/.bazaar/plugins/push_and_update [0.2.0dev]
  qbzr /Library/Python/2.6/site-packages/bzrlib/plugins/qbzr [0.20.0]
  rewrite /Library/Python/2.6/site-packages/bzrlib/plugins/rewrite [0.6.2]
  shortcuts /Domicile/glyph/.bazaar/plugins/shortcuts [unknown]
  svn /Library/Python/2.6/site-packages/bzrlib/plugins/svn [1.0.5dev]
  upload /Library/Python/2.6/site-packages/bzrlib/plugins/upload [1.0.1dev]
  xmloutput /Library/Python/2.6/site-packages/bzrlib/plugins/xmloutput [0.8.7.dev]

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.
[Error: 4]