Comment 4 for bug 701940

Here's a snippet from the .bzr.log from around the time this re-occurred:

0.124 opening working tree '/var/lib/buildbot/twisted/ubuntu-py2.6-wx/Twisted'
13.540 Packing repository GCRepositoryPackCollection(CHKInventoryRepository('file:///var/lib/buildbot/twisted/.bzr/repository/')), which has 14 pack files, containing 15858 revisions with hint ['12b63ed2bf595ccb466b1d7cb1a5bcc0'].
13.540 repacking 3 revisions
[ 2143] 2011-01-16 18:30:56.685 INFO: +N twisted/mail/topfiles/4740.feature
[ 2143] 2011-01-16 18:30:56.686 INFO: M twisted/mail/tap.py
[ 2143] 2011-01-16 18:30:56.686 INFO: M twisted/mail/test/test_options.py
[ 2143] 2011-01-16 18:30:56.826 INFO: All changes applied successfully.
[ 2143] 2011-01-16 18:30:56.967 INFO: Updated to revision 15716 of branch svn://svn.twistedmatrix.com/svn/Twisted/trunk
86.408 return code 0

Sun 2011-01-16 18:30:57 -0500
0.035 bazaar version: 2.2.2
0.035 bzr arguments: [u'version-info']
0.040 looking for plugins in /var/lib/buildbot/.bazaar/plugins
0.040 looking for plugins in /usr/lib/python2.6/dist-packages/bzrlib/plugins
0.080 encoding stdout as osutils.get_user_encoding() 'UTF-8'
0.122 opening working tree '/var/lib/buildbot/twisted/lucid32-pypy/build'
0.123 encoding stdout as osutils.get_user_encoding() 'UTF-8'
1.185 bzr-svn: using Subversion 1.6.6 ()
16.194 Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 912, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 1112, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 690, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.6/dist-packages/bzrlib/commands.py", line 705, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 135, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/builtins.py", line 1342, in run
    accelerator_tree, hardlink)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/svn/branch.py", line 376, in create_checkout
    hardlink=hardlink)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/svn/branch.py", line 321, in _create_heavyweight_checkout
    checkout_branch.pull(self, stop_revision=revision_id)
  File "/usr/lib/python2.6/dist-packages/bzrlib/branch.py", line 1068, in pull
    possible_transports=possible_transports, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/svn/branch.py", line 817, in pull
    stop_revision, overwrite, limit=limit)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/svn/branch.py", line 749, in _update_revisions
    project=self.source.project, mapping=self.source.mapping)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/svn/fetch.py", line 1528, in fetch
    self.target.pack(hint=pack_hint)
  File "/usr/lib/python2.6/dist-packages/bzrlib/decorators.py", line 194, in write_locked
    result = unbound(self, *args, **kwargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/pack_repo.py", line 2399, in pack
    self._pack_collection.pack(hint=hint, clean_obsolete_packs=clean_obsolete_packs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/pack_repo.py", line 1585, in pack
    self._execute_pack_operations(pack_operations, OptimisingPacker)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/groupcompress_repo.py", line 690, in _execute_pack_operations
    result = packer.pack()
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/pack_repo.py", line 746, in pack
    return self._create_pack_from_packs()
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/groupcompress_repo.py", line 472, in _create_pack_from_packs
    self._copy_revision_texts()
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/groupcompress_repo.py", line 410, in _copy_revision_texts
    'revisions', self._get_progress_stream, 1)
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/groupcompress_repo.py", line 399, in _copy_stream
    reuse_blocks=False):
  File "/usr/lib/python2.6/dist-packages/bzrlib/groupcompress.py", line 1653, in _insert_record_stream
    for record in stream:
  File "/usr/lib/python2.6/dist-packages/bzrlib/repofmt/groupcompress_repo.py", line 207, in pb_stream
    for idx, record in enumerate(substream):
  File "/usr/lib/python2.6/dist-packages/bzrlib/groupcompress.py", line 1413, in get_record_stream
    orig_keys, ordering, include_delta_closure):
  File "/usr/lib/python2.6/dist-packages/bzrlib/groupcompress.py", line 1572, in _get_remaining_record_stream
    for factory in batcher.yield_factories(full_flush=True):
  File "/usr/lib/python2.6/dist-packages/bzrlib/groupcompress.py", line 1130, in yield_factories
    block_read_memo, block = blocks.next()
  File "/usr/lib/python2.6/dist-packages/bzrlib/groupcompress.py", line 1369, in _get_blocks
    zdata = raw_records.next()
  File "/usr/lib/python2.6/dist-packages/bzrlib/knit.py", line 3371, in get_raw_records
    reader = pack.make_readv_reader(transport, path, offsets)
  File "/usr/lib/python2.6/dist-packages/bzrlib/pack.py", line 221, in make_readv_reader
    transport.readv(filename, readv_blocks)))
  File "/usr/lib/python2.6/dist-packages/bzrlib/transport/__init__.py", line 659, in readv
    return self._readv(relpath, offsets)
  File "/usr/lib/python2.6/dist-packages/bzrlib/transport/__init__.py", line 671, in _readv
    fp = self.get(relpath)
  File "/usr/lib/python2.6/dist-packages/bzrlib/transport/local.py", line 167, in get
    self._translate_error(e, path)
  File "/usr/lib/python2.6/dist-packages/bzrlib/transport/__init__.py", line 306, in _translate_error
    raise errors.NoSuchFile(path, extra=e)
NoSuchFile: No such file: u'/var/lib/buildbot/twisted/.bzr/repository/packs/12b63ed2bf595ccb466b1d7cb1a5bcc0.pack': [Errno 2] No such file or directory: u'/var/lib/buildbot/twisted/.bzr/repository/packs/12b63ed2bf595ccb466b1d7cb1a5bcc0.pack'