bzr log command crashes with bzrlib.errors.ObjectNotLocked

I too have experienced what I think may be this bug (under cygwin).

I run this script in an empty directory:

#!/bin/bash
bzr init
echo "La La La" > test.txt
bzr add test.txt
bzr commit -m "Created a file"
mv test.txt lost.txt
bzr commit -m "Deleted a file by mistake"
bzr log -v
bzr log test.txt

And here's the output:

Created a standalone tree (format: 2a)
adding test.txt
Committing to: /cygdrive/d/Development/BazaarTest/
added test.txt
Committed revision 1.
Committing to: /cygdrive/d/Development/BazaarTest/
missing test.txt
modified test.txt
Committed revision 2.
------------------------------------------------------------
revno: 2
committer: Brent <brent@oppenheimer>
branch nick: BazaarTest
timestamp: Mon 2009-10-26 19:42:11 +0000
message:
  Deleted a file by mistake
removed:
  test.txt
------------------------------------------------------------
revno: 1
committer: Brent <brent@oppenheimer>
branch nick: BazaarTest
timestamp: Mon 2009-10-26 19:42:07 +0000
message:
  Created a file
added:
  test.txt
bzr: ERROR: bzrlib.errors.ObjectNotLocked: <bzrlib.groupcompress._GCGraphIndex object at 0x7f9828cc> is not locked

Traceback (most recent call last):
  File "commands.py", line 842, in exception_to_return_code
  File "commands.py", line 1037, in run_bzr
  File "commands.py", line 654, in run_argv_aliases
  File "commands.py", line 1052, in ignore_pipe
  File "builtins.py", line 2280, in run
  File "log.py", line 1889, in _get_info_for_log_files
  File "log.py", line 1929, in _get_kind_for_file_id
  File "revisiontree.py", line 148, in kind
  File "inventory.py", line 1883, in __getitem__
  File "chk_map.py", line 484, in iteritems
  File "chk_map.py", line 138, in _ensure_root
  File "chk_map.py", line 151, in _get_node
  File "chk_map.py", line 162, in _read_bytes
  File "groupcompress.py", line 1423, in get_record_stream
  File "groupcompress.py", line 1528, in _get_remaining_record_stream
  File "groupcompress.py", line 2002, in get_build_details
  File "groupcompress.py", line 1922, in _check_read
ObjectNotLocked: <bzrlib.groupcompress._GCGraphIndex object at 0x7f9828cc> is not locked

bzr 2.0.0 on python 2.5.2 (CYGWIN_NT-6.0-1.5.25-0.156-4-2-i686-32bit-WindowsPE)
arguments: ['/usr/bin/bzr', 'log', 'test.txt']
encoding: 'US-ASCII', fsenc: 'US-ASCII', lang: None
plugins:
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [2.0.0]
  netrc_credential_store /usr/lib/python2.5/site-packages/bzrlib/plugins/netrc_credential_store [2.0.0]

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.

It is probably a duplicate of bug 445171.

Yes, I think this is bug 445171 too.