[issue6990] threading.local subclasses don't cleanup their state and it gets recycled

[Philip Jenvey]

Philip Jenvey <pjenvey at users.sourceforge.net> added the comment:

Also I've tagged this as a (potential) security issue. E.g. if a web app 
were affected, one user could potentially access another's data.

I actually noticed it in the Beaker sessioning/caching middleware (used by 
Pylons and other web frameworks). Though it only manifested itself as an 
exception in Beaker, others may not be so lucky

So I'd like to apply the ultimate fix all the way down to at least the 2.5 
branch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6990>
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