bzr: ERROR: exceptions.IOError: Can't rename /srv/sm-ng/push-branches/00/00/0c/bf/.bzr/repository/lock/7hf47b0lnd.tmp to /srv/sm-ng/push-branches/00/00/0c/bf/.bzr/repository/lock/held: /srv/sm-ng/push-branches/00/00/0c/bf/.bzr/repository/lock/held already exists

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 729, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 691, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 389, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 791, in run
    push_result = br_from.push(br_to, overwrite)
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 127, in read_locked
    return unbound(self, *args, **kwargs)
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1544, in push
    target.lock_write()
  File "/usr/lib/python2.5/site-packages/bzrlib/branch.py", line 1320, in lock_write
    repo_token = self.repository.lock_write()
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 252, in lock_write
    return self.control_files.lock_write(token=token)
  File "/usr/lib/python2.5/site-packages/bzrlib/lockable_files.py", line 258, in lock_write
    token_from_lock = self._lock.lock_write(token=token)
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 556, in lock_write
    return self.wait_lock()
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 485, in wait_lock
    return self.attempt_lock()
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 451, in attempt_lock
    return self._attempt_lock()
  File "/usr/lib/python2.5/site-packages/bzrlib/lockdir.py", line 219, in _attempt_lock
    self.transport.rename(tmpname, self._held_dir)
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/sftp.py", line 739, in rename
    ': unable to rename to %r' % (rel_to))
  File "/usr/lib/python2.5/site-packages/bzrlib/transport/sftp.py", line 714, in _translate_io_exception
    raise e
IOError: Can't rename /srv/sm-ng/push-branches/00/00/0c/bf/.bzr/repository/lock/7hf47b0lnd.tmp to /srv/sm-ng/push-branches/00/00/0c/bf/.bzr/repository/lock/held: /srv/sm-ng/push-branches/00/00/0c/bf/.bzr/repository/lock/held already exists

bzr 0.18.0 on python 2.5.1.final.0 (linux2)
arguments: ['/usr/bin/bzr', '-Derror', 'push', 'sftp://andrew-wedderburn@bazaar.launchpad.net/~ubuntustudio-dev/ubuntustudio-look/UbuntuStudio']

** please send this report to bazaar@lists.ubuntu.com