EOFError in tritcask _deserialize - .hint and .data disagree on key availability

There are several reports of silent Ubuntu One startup that manifests as follows in syncdaemon.log:

2012-08-22 11:08:48,862 - ubuntuone.SyncDaemon.Main - INFO - Starting Ubuntu One client version 3.0.2b
2012-08-22 11:08:48,862 - ubuntuone.SyncDaemon.Main - INFO - Using 'C:\\Users\\username\\Ubuntu One' as root dir
2012-08-22 11:08:48,862 - ubuntuone.SyncDaemon.Main - INFO - Using 'C:\\Users\\username\\AppData\\Local\\xdg\\ubuntuone\\syncdaemon' as data dir
2012-08-22 11:08:48,862 - ubuntuone.SyncDaemon.Main - INFO - Using 'C:\\Users\\username\\AppData\\Local\\xdg\\ubuntuone\\shares' as shares root dir
2012-08-22 11:08:48,862 - ubuntuone.SyncDaemon.tritcask - INFO - Initializing Tritcask on: C:\Users\username\AppData\Local\xdg\ubuntuone\syncdaemon\tritcask
2012-08-22 11:08:48,862 - ubuntuone.SyncDaemon.tritcask - DEBUG - lookingup data files
2012-08-22 11:08:49,081 - ubuntuone.SyncDaemon.tritcask - INFO - found 5 data files, 0 dead and 0 broken files
2012-08-22 11:08:49,081 - ubuntuone.SyncDaemon.tritcask - DEBUG - building the keydir, using: [u'1344062980413809', u'1343543408748278', u'1343543406439616', u'1343631846410462', u'1344064244133051']
2012-08-22 11:08:49,081 - ubuntuone.SyncDaemon.tritcask - DEBUG - loading entries from hint of: C:\Users\username\AppData\Local\xdg\ubuntuone\syncdaemon\tritcask\1343543406439616.inactive.tritcask-v1.data
2012-08-22 11:08:49,158 - ubuntuone.SyncDaemon.tritcask - DEBUG - loading entries from hint of: C:\Users\username\AppData\Local\xdg\ubuntuone\syncdaemon\tritcask\1343543408748278.inactive.tritcask-v1.data
2012-08-22 11:08:49,158 - ubuntuone.SyncDaemon.tritcask - DEBUG - loading entries from hint of: C:\Users\username\AppData\Local\xdg\ubuntuone\syncdaemon\tritcask\1343631846410462.inactive.tritcask-v1.data
2012-08-22 11:08:49,158 - ubuntuone.SyncDaemon.tritcask - DEBUG - loading entries from hint of: C:\Users\username\AppData\Local\xdg\ubuntuone\syncdaemon\tritcask\1344062980413809.inactive.tritcask-v1.data
2012-08-22 11:08:49,158 - ubuntuone.SyncDaemon.tritcask - DEBUG - Ignoring empty live file.
2012-08-22 11:08:49,158 - ubuntuone.SyncDaemon.tritcask - INFO - keydir ready! (keys: 3946)
2012-08-22 11:08:49,158 - ubuntuone.SyncDaemon.VM.MD - DEBUG - metadata version: 7
2012-08-22 11:08:49,206 - ubuntuone.SyncDaemon.fsm - INFO - loading updated metadata

No more log entries are added until restart, which adds
2012-08-22 11:12:57,417 - ubuntuone.SyncDaemon - INFO - not starting twisted.manhole

The original issue for silent failure was fixed in LP: 1041163 but the underlying EOFError remains:

Here's the output of dump_metadata.py for such kind of broken tritcask data file:

Showing Root: 'C:\\Users\\username\\Ubuntu One' (id='')

Showing UDF: 'C:\\Users\\username\\Pictures - HTC Desire HD
A9191' (id='6c95c8cf-4c9d-440a-84f6-31b4e02e8209')

Showing UDF: 'C:\\Users\\username\\Pictures - GT-P7510'
(id='6fde87dd-1d53-47b8-8d57-8b3d882749a8')

Showing trash:
  (empty)

Showing move limbo:
Traceback (most recent call last):
  File "contrib/dump_metadata.py", line 166, in <module>
    main(basedir)
  File "contrib/dump_metadata.py", line 141, in main
    for key, value in fsm.move_limbo.iteritems():
  File "/usr/lib/python2.7/UserDict.py", line 111, in iteritems
    yield (k, self[k])
  File
"/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/filesystem_manager.py",
line 281, in __getitem__
    return super(TrashTritcaskShelf, self).__getitem__(raw_key)
  File
"/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/tritcask.py",
line 953, in __getitem__
    return self._deserialize(self._db.get(self.row_type, key))
  File
"/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/tritcask.py",
line 978, in _deserialize
    return cPickle.loads(raw_value)
EOFError

It looks like the .data file does not have the entry which gets pointed to by .hint file.