bzr crashing when trying to commit to the APT repository

I have a local copy of the APT development tree where I maintain APT translations for Debian/Ubuntu:

This copy is synced with http://bzr.debian.org/apt/debian-sid/

Today, I changed some PO files locally before running "bzr update". So I finally ran it, then tried to "bzr commit". That gave this interesting result:

bubulle@mykerinos:~/src/debian/apt/bzr/debian-sid> bzr commit
Committing to: bzr+ssh://bzr.debian.org/bzr/apt/debian-sid/
modified po/ChangeLog
modified po/apt-all.pot
bzr: ERROR: bzrlib.errors.ShortReadvError: readv() read 21852 bytes rather than 22019 bytes at 45403 for "6a/ar.po-20061128205858-10pdyt0tb0x25d15-1.knit"

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 806, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 762, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.4/site-packages/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.4/site-packages/bzrlib/builtins.py", line 2328, in run
    author=author)
  File "/usr/lib/python2.4/site-packages/bzrlib/decorators.py", line 165, in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/workingtree_4.py", line 246, in commit
    result = WorkingTree3.commit(self, message, revprops, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/decorators.py", line 165, in write_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/mutabletree.py", line 187, in commit
    revprops=revprops, *args, **kwargs)
  File "/usr/lib/python2.4/site-packages/bzrlib/commit.py", line 355, in commit
    self._update_builder_with_changes()
  File "/usr/lib/python2.4/site-packages/bzrlib/commit.py", line 656, in _update_builder_with_changes
    self._populate_from_inventory(specific_files)
  File "/usr/lib/python2.4/site-packages/bzrlib/commit.py", line 784, in _populate_from_inventory
    content_summary)
  File "/usr/lib/python2.4/site-packages/bzrlib/commit.py", line 826, in _record_entry
    self.parent_invs, path, self.work_tree, content_summary)
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line 361, in record_entry_contents
    ie.text_sha1, ie.text_size = self._add_text_to_weave(
  File "/usr/lib/python2.4/site-packages/bzrlib/repository.py", line 427, in _add_text_to_weave
    check_content=False)[0:2]
  File "/usr/lib/python2.4/site-packages/bzrlib/versionedfile.py", line 138, in add_lines_with_ghosts
    parent_texts, nostore_sha, random_id, check_content)
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 918, in _add_lines_with_ghosts
    parent_texts, None, nostore_sha, random_id)
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 994, in _add
    left_matching_blocks)
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 839, in _merge_annotations
    merge_content = self._get_content(parent_id, parent_texts)
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 906, in _get_content
    text_map, contents_map = self._get_content_maps([version_id])
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 1086, in _get_content_maps
    record_map = self._get_record_map(version_ids)
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 1050, in _get_record_map
    for component_id, content, digest in \
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 2425, in read_records_iter
    for (version_id, index_memo), data in \
  File "/usr/lib/python2.4/site-packages/bzrlib/knit.py", line 1957, in get_raw_records
    for pos, data in self._transport.readv(self._filename, read_vector):
  File "/usr/lib/python2.4/site-packages/bzrlib/transport/__init__.py", line 724, in _seek_and_read
    c_offset.length, actual=len(data))
ShortReadvError: readv() read 21852 bytes rather than 22019 bytes at 45403 for "6a/ar.po-20061128205858-10pdyt0tb0x25d15-1.knit"

bzr 1.1.0.candidate.1 on python 2.4.4.final.0 (linux2)
arguments: ['/usr/bin/bzr', 'commit']
encoding: 'ANSI_X3.4-1968', fsenc: 'ANSI_X3.4-1968', lang: 'fr_FR.UTF-8'
plugins:
  bzrtools /usr/lib/python2.4/site-packages/bzrlib/plugins/bzrtools [1.1.0]
  launchpad /usr/lib/python2.4/site-packages/bzrlib/plugins/launchpad [unknown]
  multiparent /usr/lib/python2.4/site-packages/bzrlib/plugins/multiparent.pyc [unknown]
*** 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.

This is an an up-to-date Debian unstable system:

bubulle@mykerinos:~/src/debian/apt/bzr/debian-sid> dpkg -s bzr
Package: bzr
Status: install ok installed
Priority: optional
Section: devel
Installed-Size: 13726
Maintainer: Debian Bazaar Maintainers <email address hidden>
Architecture: i386
Version: 1.1~rc1-1