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We recently have had a problem that seems to indicate a small
hole in ZODB (3.4) transaction management.

Here is the sequence of events:

  We have got a repeated "ConflictError", until ZPublisher gave up.

  After this, the ZODB connection seems to be in a strange state:

    We get continuous 

       ERROR ZODB.Connection Close callback failed for 
<ZODB.Mount.MountedConnectionCloser instance at 0x9653a28c>
       ConnectionStateError: Cannot close a connection joined to a transaction

    A 'Shared.DC.ZRDB.TM.TM' instance no longer registers with
    Zope's transaction system (almost surely, because it "_registered" flag
    is still set).

    The relational database "behind" this TM gets very unhappy
    with its never ending transaction....

  No other entries in the logfile that could help to understand what

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