Actually, bzr commit segfaults (didn't see it, becaus I was running inside an ipython shell)

To eliminate the possibility that this is caused by bzr-svn, I tried a bzr only checkout from our launchpad repository into a new dir.

Unfortunately, this suffers from the same problem:

>bzr branch lp:mnemosyne-proj

bzr: ERROR: bzrlib.errors.KnitCorrupt: Knit <bzrlib.knit.KnitVersionedFiles object at 0x8b41eec> corrupt:                                                             
  sha-1 247b2550820495b85050b6228532079f5234b00f                                   
  of reconstructed text does not match                                             
  expected 6894062a40c967d184fb914508e1326f0b6b9ec6                                
  for version ('<email address hidden>',)        

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 857, in run_bzr_catch_errors                                                                       
    return run_bzr(argv)                                                           
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 797, in run_bzr 
    ret = run(*run_argv)                                                           
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 499, in run_argv_aliases                                                                           
    return self.run(**all_cmd_args)                                                
  File "/usr/lib/python2.5/site-packages/bzrlib/builtins.py", line 866, in run     
    hardlink=hardlink, stacked=stacked)                                            
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 1114, in sprout   
    hardlink=hardlink)                                                             
  File "/usr/lib/python2.5/site-packages/bzrlib/bzrdir.py", line 1410, in create_workingtree                                                                          
    accelerator_tree=accelerator_tree, hardlink=hardlink)                          
  File "/usr/lib/python2.5/site-packages/bzrlib/workingtree_4.py", line 1369, in initialize                                                                           
    basis = branch.repository.revision_tree(revision_id)                           
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked                                                                              
    result = unbound(self, *args, **kwargs)                                        
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1663, in revision_tree                                                                           
    inv = self.get_revision_inventory(revision_id)                                 
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked                                                                              
    result = unbound(self, *args, **kwargs)                                        
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1627, in get_revision_inventory                                                                  
    return self.get_inventory(revision_id)                                         
  File "/usr/lib/python2.5/site-packages/bzrlib/decorators.py", line 138, in read_locked                                                                              
    result = unbound(self, *args, **kwargs)                                        
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1520, in get_inventory                                                                           
    return self.iter_inventories([revision_id]).next()                             
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1538, in _iter_inventories                                                                       
    for text, revision_id in self._iter_inventory_xmls(revision_ids):              
  File "/usr/lib/python2.5/site-packages/bzrlib/repository.py", line 1545, in _iter_inventory_xmls                                                                    
    for record in stream:                                                          
  File "/usr/lib/python2.5/site-packages/bzrlib/knit.py", line 1221, in get_record_stream
    needed_from_fallback - absent_keys)
  File "/usr/lib/python2.5/site-packages/bzrlib/knit.py", line 1056, in _get_content_maps
    (actual_sha, digest, key))
KnitCorrupt: Knit <bzrlib.knit.KnitVersionedFiles object at 0x8b41eec> corrupt:
  sha-1 247b2550820495b85050b6228532079f5234b00f
  of reconstructed text does not match
  expected 6894062a40c967d184fb914508e1326f0b6b9ec6
  for version ('<email address hidden>',)

bzr 1.6 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'branch', 'lp:mnemosyne-proj']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.utf8'
plugins:
  launchpad            /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
  svn                  /usr/lib/python2.5/site-packages/bzrlib/plugins/svn [0.4.11]
*** 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.