MemoryError, Fatal Python error: deletion of interned StaticTuple failed

Hi. I use bazaar on Windows7 (64 bits).
Using bzr-svn, the memory error has been encountered.
As it was looking, no less than 1.9 GB was consumed.

sorry, I can write/talk only Japanese. I am writing this English using the translation tool.

Env.
===
* Windows7 64bit (Japanese)
* Bazaar (bzr) 2.5.1
  Python interpreter: C:\Program Files (x86)\Bazaar\python26.dll 2.6.6
  Python standard library: C:\Program Files (x86)\Bazaar\lib\library.zip
  Platform: Windows-7-6.1.7601-SP1
  bzrlib: C:\Program Files (x86)\Bazaar\lib\library.zip\bzrlib
  Bazaar configuration: C:/Users/xxxx/AppData/Roaming/bazaar/2.0
  Bazaar log file: C:\Users\xxxx\Documents\.bzr.log
* Plugin: svn 1.2.2

Console Log.
==========
>bzr update
HTTP serverl, Realm: 'Authorization Realm' username: xxxx
HTTP xxxx@server, Realm: 'Authorization Realm' password:
Traceback (most recent call last):evisions to fetch 3/193
  File "bzrlib\trace.pyo", line 641, in __exit__
MemoryError
Exception MemoryError: MemoryError() in <module 'threading' from 'C:\Program Files (x86)\Bazaar\lib\library.zip
threading.pyo'> ignored
Error in sys.exitfunc:
MemoryError
Exception MemoryError: MemoryError() in <function remove at 0x02EB17B0> ignored
Fatal Python error: deletion of interned StaticTuple failed

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

.bzr.log
======
Fri 2012-08-10 20:27:04 +0900
0.067 bazaar version: 2.5.1
0.067 bzr arguments: [u'update']
0.070 looking for plugins in C:/Users/xxxx/AppData/Roaming/bazaar/2.0/plugins
0.070 looking for plugins in C:/Program Files (x86)/Bazaar/plugins
0.130 encoding stdout as sys.stdout encoding 'cp932'
0.160 opening working tree 'C:/Users/xxxx/projects/aaa/bbb/ccc/repos/svn-trunk'
3.574 bzr-svn: using Subversion 1.6.6 (), subvertpy 0.8.10
3.968 potential branching layouts: [('trunk0', 191)]
3.968 Guessed repository layout: TrunkLayout(0), guess layout to use: TrunkLayout(0)
4.301 potential branching layouts: [('trunk0', 191)]
4.301 Guessed repository layout: TrunkLayout(0), guess layout to use: TrunkLayout(0)
4.780 potential branching layouts: [('trunk0', 191)]
4.780 Guessed repository layout: TrunkLayout(0), guess layout to use: TrunkLayout(0)
5.118 potential branching layouts: [('trunk0', 191)]
5.118 Guessed repository layout: TrunkLayout(0), guess layout to use: TrunkLayout(0)
[ 3008] 2012-08-10 20:34:09.290 INFO: Discarding watch for VCSPath(u'C:\\Users\\xxxx\\projects\\aaa\\bbb\\ccc\\repos') - it has expired
553.652 Transferred: 51kB (0.1kB/s r:2kB w:1kB u:48kB)

bzr config
========
C:\Users\xxxx\projects\aaa\bbb\ccc\repos\svn-trunk>bzr config
branch:
  bound_location = http://server/repos/ccc/trunk
  bound = True
  submit_branch = file:///C:/Users/xxxx/projects/aaa/bbb/ccc/repos
/trunk/
  commit_data = {}
bazaar:
  [DEFAULT]
...

bzr info
======
C:\Users\xxxx\projects\aaa\bbb\ccc\repos\svn-trunk>bzr info -v
Repository checkout (format: 2a)
Location:
  repository checkout root: .
        checkout of branch: http://server/repos/ccc/trunk
         shared repository: C:/Users/xxxx/projects/aaa/bbb/ccc/repos

Related branches:
  submit branch: C:/Users/xxxx/projects/aaa/bbb/ccc/repos/trunk

Format:
       control: Meta directory format 1
  working tree: Working tree format 6
        branch: Branch format 7
    repository: Repository format 2a - rich roots, group compression and chk inventories

Control directory:
         1 branches
HTTP server, Realm: 'Authorization Realm' username: xxxx
HTTP xxxx@server, Realm: 'Authorization Realm' password:

Branch is out of date: missing 67 revisions.

In the working tree:
       474 unchanged
         0 modified
         0 added
         0 removed
         0 renamed
         0 unknown
         0 ignored
        68 versioned subdirectories

Branch history:
       125 revisions
        36 days old
   first revision: Thu 2012-07-05 03:39:31 +0000
  latest revision: Fri 2012-08-03 21:53:05 +0900

Repository:
       157 revisions

There is enough information?
thank you.