accessing a bzr:// branch with a revisionspec causes bzr to crash

When attempting to get access to a branch shared via the bzr stand alone server and giving it a revisionspec option, causes the following crash. It works fine if you exclude the revisionspec, and it works fine if you access it via bzr+ssh://, but this combination of options makes it crash every time.

bzr ls -v --show-ids -r-1 bzr://s-ilsfile1/www/www.xxxxxxx.net/

bzr: ERROR: bzrlib.errors.ObjectNotLocked: _KnitGraphIndex(CombinedGraphIndex(GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/ec5413e20554c050597fae577c5b9a8d.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/e2ba533575d64c6b89ff9fc0032700a3.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/e1acb2eeb4097ca0705aa88fba0d6862.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/c46b604a8c45bd41bcb105c6a823bb6d.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/9798d44757ed01409344c5102c883adc.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/78b6218cec5e9379bd24a9f9fc03128a.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/55a0b13205ff81968b9556b0e4fb4bf9.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/4a4fbdc2797d632697c38ea24ec20cf9.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/3f81911ce2c477a02cef8185b3a24a30.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/372c44112ae9ce502aa0a585bbf129dd.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/26c3901c0c1cf7ed16209fbeaaab4bd6.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/17056ecc5c4bb0e8cb247cadd1fb4468.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/01180b7a167da804833121990f4dd7db.rix'))) is not locked

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 835, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1030, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 647, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 1045, in ignore_pipe
    result = func(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 2487, in run
    tree = _get_one_revision_tree('ls', revision, branch=branch)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 132, in _get_one_revision_tree
    rev_tree = revision.as_tree(branch)
  File "/usr/lib/python2.5/site-packages/bzrlib/revisionspec.py", line 260, in as_tree
    return self._as_tree(context_branch)
  File "/usr/lib/python2.5/site-packages/bzrlib/revisionspec.py", line 269, in _as_tree
    revision_id = self.as_revision_id(context_branch)
  File "/usr/lib/python2.5/site-packages/bzrlib/revisionspec.py", line 243, in as_revision_id
    return self._as_revision_id(context_branch)
  File "/usr/lib/python2.5/site-packages/bzrlib/revisionspec.py", line 387, in _as_revision_id
    branch, revno, revision_id = self._lookup(context_branch, None)
  File "/usr/lib/python2.5/site-packages/bzrlib/revisionspec.py", line 380, in _lookup
    revision_id = branch.get_rev_id(revno, revs_or_none)
  File "/usr/lib/python2.5/site-packages/bzrlib/remote.py", line 2271, in get_rev_id
    revno, last_revision_info)
  File "/usr/lib/python2.5/site-packages/bzrlib/remote.py", line 691, in get_rev_id_for_revno
    return self._get_rev_id_for_revno_vfs(revno, known_pair)
  File "/usr/lib/python2.5/site-packages/bzrlib/remote.py", line 684, in _get_rev_id_for_revno_vfs
    revno, known_pair)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 2269, in get_rev_id_for_revno
    self, partial_history, stop_index=distance_from_known)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 4370, in _iter_for_revno
    iterator.next()
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 2299, in iter_reverse_revision_history
    parents = graph.get_parent_map([next_id])[next_id]
  File "/usr/lib/python2.5/site-packages/bzrlib/graph.py", line 167, in get_parent_map
    parent_map = self._get_parent_map(needed_revisions)
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 2457, in get_parent_map
    self.revisions.get_parent_map(query_keys).iteritems():
  File "/usr/lib/python2.5/site-packages/bzrlib/knit.py", line 1193, in get_parent_map
    return self._get_parent_map_with_sources(keys)[0]
  File "/usr/lib/python2.5/site-packages/bzrlib/knit.py", line 1212, in _get_parent_map_with_sources
    new_result = source.get_parent_map(missing)
  File "/usr/lib/python2.5/site-packages/bzrlib/knit.py", line 3047, in get_parent_map
    self._check_read()
  File "/usr/lib/python2.5/site-packages/bzrlib/knit.py", line 2930, in _check_read
    raise errors.ObjectNotLocked(self)
ObjectNotLocked: _KnitGraphIndex(CombinedGraphIndex(GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/ec5413e20554c050597fae577c5b9a8d.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/e2ba533575d64c6b89ff9fc0032700a3.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/e1acb2eeb4097ca0705aa88fba0d6862.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/c46b604a8c45bd41bcb105c6a823bb6d.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/9798d44757ed01409344c5102c883adc.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/78b6218cec5e9379bd24a9f9fc03128a.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/55a0b13205ff81968b9556b0e4fb4bf9.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/4a4fbdc2797d632697c38ea24ec20cf9.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/3f81911ce2c477a02cef8185b3a24a30.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/372c44112ae9ce502aa0a585bbf129dd.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/26c3901c0c1cf7ed16209fbeaaab4bd6.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/17056ecc5c4bb0e8cb247cadd1fb4468.rix'), GraphIndex('bzr://s-ilsfile1/.bzr/repository/indices/01180b7a167da804833121990f4dd7db.rix'))) is not locked

bzr 1.17 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'ls', '-v', '--show-ids', '-r-1', 'bzr://s-ilsfile1/www/www.xxxxxxx.net/']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  bzrtools /usr/lib/python2.5/site-packages/bzrlib/plugins/bzrtools [1.17]
  etckeeper /usr/lib/python2.5/site-packages/bzrlib/plugins/etckeeper [unknown]
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [1.17]
  netrc_credential_store /usr/lib/python2.5/site-packages/bzrlib/plugins/netrc_credential_store [1.17]
  rebase /usr/lib/python2.5/site-packages/bzrlib/plugins/rebase [0.3]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.