Unexpected tag failure branching a Subversion repository

[Russel Winder]

|> bzr branch https://svn.codehaus.org/gant/gant/trunk Trunk
bzr: ERROR: exceptions.AssertionError: Unable to find direct lhs parent for <RevisionMetadata for revision 9741, path gant/tags/0.1.0 in repository 'd02f77da-47a5-474d-b610-f18e4bea325a'>

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 893, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 839, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 539, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 1038, in run
    source_branch=br_from)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/remote.py", line 65, in sprout
    return super(SvnRemoteAccess, self).sprout(*args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 1114, in sprout
    result, revision_id=_mod_revision.NULL_REVISION)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 705, in sprout
    self.copy_content_into(result, revision_id=revision_id)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 753, in copy_content_into
    self.tags.merge_to(destination.tags)
  File "/usr/lib/python2.5/site-packages/bzrlib/tag.py", line 211, in merge_to
    source_dict = self.get_tag_dict()
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/tags.py", line 106, in get_tag_dict
    tag_revmetas = self._get_tag_dict_revmeta()
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/tags.py", line 103, in _get_tag_dict_revmeta
    revnum=self.branch._revnum)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/repository.py", line 939, in find_tags
    layout=layout, mapping=mapping, from_revnum=0, to_revnum=revnum)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/repository.py", line 906, in find_tags_between
    tags[revmeta.branch_path] = revmeta.get_tag_revmeta(mapping)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 211, in get_tag_revmeta
    lhs_parent_revmeta = self.get_lhs_parent_revmeta(mapping)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 332, in get_lhs_parent_revmeta
    nm = get_next_parent(self)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 327, in get_next_parent
    pm = nm.get_direct_lhs_parent_revmeta()
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 299, in get_direct_lhs_parent_revmeta
    self._direct_lhs_parent_revmeta = metaiterator.get_lhs_parent(self)
  File "/usr/lib/python2.5/site-packages/bzrlib/plugins/svn/revmeta.py", line 979, in get_lhs_parent
    raise AssertionError("Unable to find direct lhs parent for %r" % revmeta)
AssertionError: Unable to find direct lhs parent for <RevisionMetadata for revision 9741, path gant/tags/0.1.0 in repository 'd02f77da-47a5-474d-b610-f18e4bea325a'>

bzr 1.11 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'branch', 'https://svn.codehaus.org/gant/gant/trunk', 'Trunk']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_GB.UTF-8'
plugins:
  bookmarks /home/users/russel/.bazaar/plugins/bookmarks [unknown]
  bzrtools /home/users/russel/.bazaar/plugins/bzrtools [1.11]
  email /usr/lib/python2.5/site-packages/bzrlib/plugins/email [unknown]
  gtk /home/users/russel/.bazaar/plugins/gtk [0.96.0.dev.1]
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
  loom /usr/lib/python2.5/site-packages/bzrlib/plugins/loom [1.4dev]
  netrc_credential_store /usr/lib/python2.5/site-packages/bzrlib/plugins/netrc_credential_store [unknown]
  pqm /usr/lib/python2.5/site-packages/bzrlib/plugins/pqm [1.0dev]
  qbzr /home/users/russel/.bazaar/plugins/qbzr [0.9.7dev]
  rebase /home/users/russel/.bazaar/plugins/rebase [0.4.3dev]
  stats /usr/lib/python2.5/site-packages/bzrlib/plugins/stats [unknown]
  svn /usr/lib/python2.5/site-packages/bzrlib/plugins/svn [0.5]
  upload /usr/lib/python2.5/site-packages/bzrlib/plugins/upload [0.1]
  xmloutput /home/users/russel/.bazaar/plugins/xmloutput [0.8.2]
*** 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.

[Jelmer Vernooij (jelmer)]

  status triaged
  importance medium
--
Jelmer Vernooij <email address hidden> - http://samba.org/~jelmer/
Jabber: <email address hidden>