TooManyConcurrentRequests when failing to start remote bzr

[Rob Weir]

When BZR_REMOTE_PATH is unset, using "bzr pull" gives a sensible error, but "bzr pull url", even when copy and pasted from the "info" output, produces a scary looking traceback.
Slightly contrived example::

rob@egads:~/bzr.dev$ bzr info
Standalone tree (format: pack-0.92)
Location:
  branch root: .

Related branches:
  parent branch: bzr+ssh://localhost/home/rob/bzr.dev/
rob@egads:~/bzr.dev$ bzr pull
Using saved location: bzr+ssh://localhost/home/rob/bzr.dev/
rob@localhost's password:
bash: bzr: command not found
bzr: ERROR: Connection closed: please check connectivity and permissions (and try -Dhpss if further diagnosis is required)
rob@egads:~/bzr.dev$ bzr pull bzr+ssh://localhost/home/rob/bzr.dev/
rob@localhost's password:
bash: bzr: command not found
bzr: ERROR: bzrlib.errors.TooManyConcurrentRequests: The medium '<bzrlib.smart.medium.SmartSSHClientMedium object at 0xb762f0ac>' has reached its concurrent request limit. Be sure to finish_writing and finish_reading on the currently open request.

Traceback (most recent call last):
  File "/home/rob/bzr.dev/bzrlib/commands.py", line 834, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/home/rob/bzr.dev/bzrlib/commands.py", line 790, in run_bzr
    ret = run(*run_argv)
  File "/home/rob/bzr.dev/bzrlib/commands.py", line 492, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/rob/bzr.dev/bzrlib/builtins.py", line 657, in run
    possible_transports=possible_transports)
  File "/home/rob/bzr.dev/bzrlib/branch.py", line 110, in open
    possible_transports=possible_transports)
  File "/home/rob/bzr.dev/bzrlib/bzrdir.py", line 651, in open
    return BzrDir.open_from_transport(t, _unsupported=_unsupported)
  File "/home/rob/bzr.dev/bzrlib/bzrdir.py", line 688, in open_from_transport
    redirected)
  File "/home/rob/bzr.dev/bzrlib/transport/__init__.py", line 1657, in do_catching_redirections
    return action(transport)
  File "/home/rob/bzr.dev/bzrlib/bzrdir.py", line 664, in find_format
    return transport, BzrDirFormat.find_format(
  File "/home/rob/bzr.dev/bzrlib/bzrdir.py", line 1422, in find_format
    return format.probe_transport(transport)
  File "/home/rob/bzr.dev/bzrlib/bzrdir.py", line 2406, in probe_transport
    server_version = medium.protocol_version()
  File "/home/rob/bzr.dev/bzrlib/smart/medium.py", line 383, in protocol_version
    medium_request = self.get_request()
  File "/home/rob/bzr.dev/bzrlib/smart/medium.py", line 442, in get_request
    return SmartClientStreamMediumRequest(self)
  File "/home/rob/bzr.dev/bzrlib/smart/medium.py", line 617, in __init__
    raise errors.TooManyConcurrentRequests(self._medium)
TooManyConcurrentRequests: The medium '<bzrlib.smart.medium.SmartSSHClientMedium object at 0xb762f0ac>' has reached its concurrent request limit. Be sure to finish_writing and finish_reading on the currently open request.

bzr 1.4dev on python 2.4.4 (linux2)
arguments: ['/home/rob/bin/bzr', 'pull', 'bzr+ssh://localhost/home/rob/bzr.dev/']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_AU.UTF-8'
plugins:
  launchpad /home/rob/bzr.dev/bzrlib/plugins/launchpad [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.