[Spambayes] spam that crashes my spambayes

Gerald Pine gdpine at pacbell.net
Fri Jan 7 18:20:11 CET 2005

Thanks, guys.  I hate to go back to scratch and retrain, but I do see
the error frequently.

On Thu, 2005-01-06 at 20:23, Tim Peters wrote:
> [Gerald Pine]
> >> This is an example of a spam email that crashes my spambayes
> >> installation.  Am running spambayes 1.0.1 on SuSE Linux 9.1.  Some of
> >> the log output follows.
> >> [...]
> >>   File "/usr/lib/python2.3/shelve.py", line 119, in __getitem__
> >>     value = Unpickler(f).load()
> >> UnpicklingError: unpickling stack underflow
> [Tony Meyer]
> > This is a very unusual error.  My best guess would be that the database is
> > corrupted somehow and should be replaced (retraining would be the easiest
> > way).  If this happens with lots of messages, irregardless of whether they
> > are ham or spam, that would strengthen the guess.
> Unfortunately, I have to agree, although it screams "corruption" to me
> without more evidence than we already have.  This can only happen if
> the pickle is ill-formed, and the only way to get an ill-formed pickle
> is for bytes to get corrupted (on disk, or in RAM, or on a
> communication path between disk and RAM, or ...).  Even if it's disk
> corruption, databases aren't likely to notice it, since it occurs
> inside the user's stored data, not in the database's own
> administrative structures (to which latter database code *is*
> sensitive).
Gerald D. Pine
1530 4th Street, #26
Sacramento, CA 95814
phone:  (916) 444-5413
email:  gdpine at pacbell.net

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