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We thought we squashed the last of the
modify-the-dict-from-a-custom-eq kind of bugs long ago. 
Too bad.

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The cause of the bug is that if oldtable == mp->ma_smalltable
then pure Python code can mangle with mp->ma_smalltable while
it is being walked on. A simple fix would be to always make
a copy of the oldtable if it is mp->ma_smalltable (not only
if oldtable == newtable).
Attached a more efficient fix, which should also make dict
resizing somehow faster. It requires yet another version
of the lookup algorithm, though. It's a very simple version
that assumes that all items are different and the dict
contains no dummy entries.

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Fixed by patch #1497053.

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Patch 1497053 was checked in as revision 46589 of the trunk
for Python 2.5, so closing this. I doubt it's worth the
effort to backport to 2.4.

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I backported the parts of rev 46589 relevant to this bug to
the 2.4 maint branch, as rev 52256, for Python 2.4.4.