Bugs fixed:

  When objects were added in savepoints and either the savepoint was
  rolled back (https://bugs.launchpad.net/zodb/+bug/143560) or the
  transaction was aborted
  (https://mail.zope.org/pipermail/zodb-dev/2010-June/013488.html)
  The objects' _p_oid and _p_jar variables weren't cleared, leading to
  surprizing errors.

src/CHANGES.txt

@@ -2,6 +2,20 @@
  Change History
 ================
 
+3.10.0b7 (2010-09-??)
+=====================
+
+Bugs fixed
+----------
+
+- When objects were added in savepoints and either the savepoint was
+  rolled back (https://bugs.launchpad.net/zodb/+bug/143560) or the
+  transaction was aborted
+  (https://mail.zope.org/pipermail/zodb-dev/2010-June/013488.html)
+  The objects' _p_oid and _p_jar variables weren't cleared, leading to
+  surprizing errors.
+
+
 3.10.0b6 (2010-09-08)
 =====================
 

src/ZODB/Connection.py

@@ -442,6 +442,8 @@ class Connection(ExportImport, object):
             assert oid is not None
             if oid in self._added:
                 del self._added[oid]
+                if self._cache.get(oid) is not None:
+                    del self._cache[oid]
                 del obj._p_jar
                 del obj._p_oid
                 self._db.save_oid(oid)
@@ -742,7 +744,6 @@ class Connection(ExportImport, object):
         """Disown any objects newly saved in an uncommitted transaction."""
         if creating is None:
             creating = self._creating
-            self._creating = {}
 
         for oid in creating:
             self._db.save_oid(oid)
@@ -752,6 +753,8 @@ class Connection(ExportImport, object):
                 del o._p_jar
                 del o._p_oid
 
+        creating.clear()
+
     def tpc_vote(self, transaction):
         """Verify that a data manager can commit the transaction."""
         try:
@@ -1104,7 +1107,10 @@ class Connection(ExportImport, object):
         self._creating.clear()
         self._registered_objects = []
 
-        state = self._storage.position, self._storage.index.copy()
+        state = (self._storage.position,
+                 self._storage.index.copy(),
+                 self._storage.creating.copy(),
+                 )
         result = Savepoint(self, state)
         # While the interface doesn't guarantee this, savepoints are
         # sometimes used just to "break up" very long transactions, and as
@@ -1117,6 +1123,7 @@ class Connection(ExportImport, object):
         self._abort()
         self._registered_objects = []
         src = self._storage
+        self._invalidate_creating(src.creating)
         index = src.index
         src.reset(*state)
         self._cache.invalidate(index)
@@ -1163,6 +1170,7 @@ class Connection(ExportImport, object):
     def _abort_savepoint(self):
         """Discard all savepoint data."""
         src = self._savepoint_storage
+        self._invalidate_creating(src.creating)
         self._storage = self._normal_storage
         self._savepoint_storage = None
 
@@ -1182,8 +1190,11 @@ class Connection(ExportImport, object):
         # by another thread, so the risk of a reread is pretty low.
         # It's really not worth the effort to pursue this.
 
+        # Note that we do this *after* reseting the storage so that, if
+        # data are read, we read it from the reset storage!
+
         self._cache.invalidate(src.index)
-        self._invalidate_creating(src.creating)
+
         src.close()
 
     # Savepoint support
@@ -1311,7 +1322,7 @@ class TmpStore:
     def temporaryDirectory(self):
         return self._storage.temporaryDirectory()
 
-    def reset(self, position, index):
+    def reset(self, position, index, creating):
         self._file.truncate(position)
         self.position = position
         # Caution:  We're typically called as part of a savepoint rollback.
@@ -1324,6 +1335,7 @@ class TmpStore:
         # a copy of the index here.  An alternative would be to ensure that
         # all callers pass copies.  As is, our callers do not make copies.
         self.index = index.copy()
+        self.creating = creating
 
 class RootConvenience(object):
 

src/ZODB/tests/testConnection.py

@@ -759,8 +759,72 @@ Read checks to work accross savepoints.
 
     """
 
-# check interaction w savepoint
-# check call in read-only trans followed by write trans
+class C_invalidations_of_new_objects_work_after_savepoint(Persistent):
+    def __init__(self):
+        self.settings = 1
+
+    def _p_invalidate(self):
+        print 'INVALIDATE', self.settings
+        Persistent._p_invalidate(self)
+        print self.settings   # POSKeyError here
+
+def abort_of_savepoint_creating_new_objects_w_exotic_invalidate_doesnt_break():
+    r"""
+    Before, the following would fail with a POSKeyError, which was
+    somewhat surprizing, in a very edgy sort of way. :)
+
+    Really, when an object add is aborted, the object should be "removed" from
+    the db and its invalidatuon method shouldm't even be called:
+
+    >>> conn = ZODB.connection(None)
+    >>> conn.root.x = x = C_invalidations_of_new_objects_work_after_savepoint()
+    >>> _ = transaction.savepoint()
+    >>> x._p_oid
+    '\x00\x00\x00\x00\x00\x00\x00\x01'
+
+    >>> x._p_jar is conn
+    True
+
+    >>> transaction.abort()
+
+After the abort, the oid and jar are None:
+
+    >>> x._p_oid
+    >>> x._p_jar
+
+    """
+
+class Clp9460655(Persistent):
+    def __init__(self, word, id):
+        super(Clp9460655, self).__init__()
+	self.id = id
+        self._word = word
+
+def lp9460655():
+    r"""
+    >>> conn = ZODB.connection(None)
+    >>> root = conn.root()
+    >>> Word = Clp9460655
+
+    >>> from BTrees.OOBTree import OOBTree
+    >>> data = root['data'] = OOBTree()
+
+    >>> commonWords = []
+    >>> count = "0"
+    >>> for x in ('hello', 'world', 'how', 'are', 'you'):
+    ...         commonWords.append(Word(x, count))
+    ...         count = str(int(count) + 1)
+
+    >>> sv = transaction.savepoint()
+    >>> for word in commonWords:
+    ...         sv2 = transaction.savepoint()
+    ...         data[word.id] = word
+
+    >>> sv.rollback()
+    >>> print commonWords[1].id  # raises POSKeyError
+    1
+
+    """